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Rheological Behaviors of a Series of Hyperbranched Polyethers 认领 引用 被引量：2
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作者 Xue-pei Miao Yan-shuang Guo +2 位作者 Li-fan He 孟焱 李效玉 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2015年第11期1574-1585,共12页
Hyperbranched polyethers with different structures and molecular weights（MW） were synthesized using the A2＋B3 approach by varying monomer ratio, A2 structure, and reaction time. Effects of backbone structure and MW... Hyperbranched polyethers with different structures and molecular weights（MW） were synthesized using the A2＋B3 approach by varying monomer ratio, A2 structure, and reaction time. Effects of backbone structure and MW on melt rheological behaviors were investigated by both small amplitude oscillatory shear and steady shear measurements. Master curves were constructed using the time-temperature superposition principle and compared. In the reduced frequency range covered, lg G″-lg（ω·aT） always show a slope of 1.0, suggesting a terminal zone behavior; in contrast, unexpected step changes or plateaus are observed on lg G′ master curves. Effects of backbone structure and MW on master curves were discussed. The Cox-Merz rule was tested at different temperatures and was found to be applicable when flow instability was absent. 展开更多
关键词 Hyperbranched polyethers Rheology Time-temperature superposition
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Isocyanate-terminated Polyethers Toughened Epoxy Resin:Chemical Modification,Thermal Properties,and Mechanical Strength 认领 引用 被引量：1
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作者 CAI Haopeng WANG Jun WANG XiangXU Renxin 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2007年第2期256-260,共5页
The toughening of the diglycidyl ether of bisphenol A epoxy resin with isocyanateterminated polyethers(ITPE)was investigated.The progress of the reaction and the structural changes during modification process were stu... The toughening of the diglycidyl ether of bisphenol A epoxy resin with isocyanateterminated polyethers(ITPE)was investigated.The progress of the reaction and the structural changes during modification process were studied using FTIR spectroscopy.The studies support the proposition that TDI(tolylene diisocyanate)acts as a coupling agent between the epoxy and polyethers,forming a urethane linkage with the former and the latter,respectively.Me THPA-cured ER/ITPs blends were characterized using dynamic mechanical analysis(DMA)and thermogravimetric analysis(TGA).It is indicated the glass transition temperature(T)of systems was lower than the T of pure epoxy resin and overfull ITPE separated from the modified epoxy resin and formed another phase at an ITPE-content of more than 10wt%.The thermal stability was decreased by the introduction of ITPE.The impact strength and the flexural strength of the cured modifiedepoxy increased with increasing the ITPE content and a maximum plateau value of about 24.03 kJ/m^2 and 130.56 MPa was measured in 10wt%ITPE.From scanning electron microscopy(SEM)studies of the fractrue surfaces of ER/ITPE systems,the nature of the micromechanisms responsible for the increases in toughness of the systems was identified. 展开更多
关键词 isocyanate-terminated polyethers epoxy resin DMA SEM impact strength
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MECHANICAL PROPERTIES AND CURING KINETICS OF EPOXY RESINS CURED BY VARIOUS AMINO-TERMINATED POLYETHERS 认领 引用 被引量：11
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作者 Li-ying Zhao Jian-guo Guan +1 位作者 Hui-ru Ma Zhi-gang Sun 《Chinese Journal of Polymer Science》 SCIE EI CAS 2010年第6期961-969,共9页
A high performance thermosetting epoxy resin crosslinkable at room temperature was obtained via directly moulding diglycidyl ether of bisphenol A（DGEBA） and flexibleα,ω-bisamino（n-alkylene）phenyl terminated poly... A high performance thermosetting epoxy resin crosslinkable at room temperature was obtained via directly moulding diglycidyl ether of bisphenol A（DGEBA） and flexibleα,ω-bisamino（n-alkylene）phenyl terminated poly（ethylene glycol）.The influences of the n-alkylene inserted in aminophenyl of flexible amino-terminated polythers（ATPE） on the mechanical properties,fractographs and curing kinetics of the ATPE-DGEBA cured products were studied.The results show that the insertion of n-alkylene group into the aminophenyl group of the ATPE,on one hand,can significantly increase the strain relaxation rate and decrease glass transition temperature of the ATPE-DGEBA cured products,resulting in slight decrease of the Young’s modulus and tensile strength,and significant increase of the toughness and elongation of the ATPE-DGEBA cured products.On the other hand,it can remarkably enhance the reactivity of amine with epoxy,much accelerating the curing rate of the ATPE-DGEBA systems.The activation energy of DGEBA cured by BAPTPE,BAMPTPE and BAEPTPE was 53.1,28.5 and 25.4 kJ·mol;,respectively.The as-obtained ATPE-DGEBA cured products are homogeneous, transparent,and show excellent mechanical properties including tensile strength and toughness.Thus they are promising to have important applications in structure adhesives,casting bulk materials,functional coatings,cryogenic engineering, damping and sound absorbing materials. 展开更多
关键词 Epoxy resin Amine-terminated polyether Fractography Curing kinetics Mechanical properties
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Synthesis and Characterization of EO/PO Random Copolyethers 认领 引用 被引量：1
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作者 郭建国 苑仁旭 +3 位作者 何素芹 朱诚身 焦宇 江建明 《Journal of Donghua University(English Edition)》 EI CAS 2004年第5期60-64,共5页
Ethylene oxide(EO) and propylene oxide(PO) random copolyethers were synthesized by the sequential addition of the mixture of ethylene oxide and propylene oxide to propylene glycol (initiator) in the presence of potass... Ethylene oxide(EO) and propylene oxide(PO) random copolyethers were synthesized by the sequential addition of the mixture of ethylene oxide and propylene oxide to propylene glycol (initiator) in the presence of potassium hydroxide(KOH), and characterized with infrared spectrum(FTIR) and nuclear magnetism resonance(NMR). The effects of catalyst concentration, reaction temperature, charging rate and EO/PO mixture ratio on the polymerization reaction were investigated. It was revealed that the optimal reaction condition is the ratio of 2.5∶1 000(KOH mass vs. product mass), at 114.6℃ and pressure below 0.4 MPa. The residual KOH was neutralized by phosphoric acid(H 3PO 4). Then the crude copolyether was refined with adsorbents, and the refined copolyether, which contains less than 0.7 μg/ml K+, was obtained as colorless, viscous liquid. 展开更多
关键词 ethylene oxide propylene oxide polyether propylene glycol
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Synthesis of Arsamacrocyclic Polyethers 认领 引用
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作者 Xin You CHEN Guo Feng YU Wen Tian TAO 《Chinese Chemical Letters》 SCIE CAS 1999年第8期665-666,共2页
The synthesis of eight new arsamacrocyclic Polyethers was described. The structures of these compounds were characterized by elemental analysis, IR, H-1-NMR and MS.
关键词 macrocyclic compound arsamacrocyclic polyether synthesis
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Topology-Controlled Polyethers:A Synthetic Platform for Tunable Properties and Applications 认领 引用
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作者 Jinsu Baek Aram Shin +2 位作者 Namhee Kim Sang-Ho Lee Byeong-Su Kim 《Accounts of Materials Research》 CAS CSCD 2025年第10期1204-1219,共16页
CONSPECTUS:Topology control in polymer chemistry enables precise tuning of physical properties and molecular interactions which exert a significant impact on the performance of the resulting polymeric materials.Indeed... CONSPECTUS:Topology control in polymer chemistry enables precise tuning of physical properties and molecular interactions which exert a significant impact on the performance of the resulting polymeric materials.Indeed,polymers comprising identical monomers can exhibit entirely distinct properties due to differences in their topologies.Polyethers,particularly poly(ethylene oxide)and derivatives of functional epoxide monomers,serve as a representative example in which the polymer backbone engages in direct interactions,such as hydrogen bonding or ion coordination,thereby maximizing the topological impact on the resulting polymer properties.Despite their significance,studies on the topology control of polyethers have largely remained fragmented.Achieving precise control requires a range of synthetic approaches,including the careful selection of monomers and catalysts designed to guide specific polymer topology.Furthermore,the in-depth characterization of the resulting polymers utilizing tools such as quantitative 13C NMR spectroscopy,MALDI-TOF mass spectrometry,and size exclusion chromatography is essential and provides detailed information on topological structure.These analyses reveal the relationships between polymer topology and diverse physical properties such as diffusion,hydrodynamic volume or chain dynamics.Applying these insights to the design of new materials,particularly in areas where conventional polyethers are limited,remains a promising but insufficiently explored direction.Comprehensive research that connects synthesis,structural analysis,and application design requires broad scientific expertise,which may explain the scarcity of fully integrated studies in this field.In this Account,we aim to provide a comprehensive overview of recent advances in the synthesis,characterization,and application of topology-controlled polyethers,namely,linear,hyperbranched,and branched cyclic architectures.By developing scalable,metal-free catalytic systems based on frustrated Lewis pairs and anionic ring-opening polymerization strategies,we established a versatile platform to access polyglycerols with well-defined topologies in comparable molecular weights.Structural and spectroscopic analyses revealed pronounced topology-dependent variations in thermal transitions,segmental diffusion,and mechanical strength.These architectural differences resulted in distinct functional outcomes across various applications,including antifouling coatings,self-healing materials,high-performance adhesives,and cryoprotectants.Notably,branched cyclic polyglycerols demonstrated superior mechanical resilience,rapid stress relaxation,and enhanced hydrogen bonding in networked systems,while dendritic structures exhibited exceptional antifreeze activity under ionic conditions.These findings highlight the fundamental role of polymer topology in governing inter-and intramolecular interactions,enabling the rational design of responsive and multifunctional polyether-based materials.The integration of precise synthetic strategies with data-driven approaches is advancing topological design in polymer science.Tools such as deep learning enable predictive links between molecular architecture and material properties,allowing access to complex structures.This convergence is anticipated to accelerate the development of functional polymers tailored for applications in biomedicine,energy,soft matter,and sustainable technologies. 展开更多
关键词 polymeric materialsindeedpolymers tuning physical properties polymer backbone synthetic platforms polymer chemistry monomers topology controlled polyethers tunable properties
Fluoro-Functionalized Polyether Electrolytes Enabling High-Energy-Density Solid-State Lithium-Metal Batteries 认领 引用
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作者 Nannan Geng Chenkai Lu +6 位作者 Wenbei Li Qianxin Liu Zixuan Zhou Tao Yang Yin Cui Guobin Zhang Xidong Lin 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2026年第3期128-141,共14页
Due to their non-flammability,remarkable flexibility,ease of processing,and design versatility,polymer-based electrolytes containing polyethers have emerged as pivotal materials for high-energy-density and safe lithiu... Due to their non-flammability,remarkable flexibility,ease of processing,and design versatility,polymer-based electrolytes containing polyethers have emerged as pivotal materials for high-energy-density and safe lithium-metal batteries.Although polyethers provide sufficient sites for Li⁺transport through ether-oxygen coordination,they still exhibit low room-temperature ionic conductivity and poor oxidation stability,which remains a critical obstacle to the commercialization of lithium-metal batteries.Given fluorine's strong electronegativity and the excellent stability of C-F bonds,fluorination strategies have proven effective in enhancing the oxidative stability of polymer-based electrolytes and extending the cycling life of lithium-metal batteries.Notably,incorporating fluorine into ether-based polymer-based electrolytes can simultaneously improve ionic conductivity,mechanical properties,and the formation of stable electrode/electrolyte interfaces.In this review,we comprehensively examine the design of fluoro-functionalized polyether electrolytes for advanced lithium-metal batteries and their impact on battery performance.Our primary objectives are to elucidate the structure-property relationships of fluoro-functionalized polyether electrolytes and to explore their mechanisms in improving interfacial stability and electrochemical performance.Furthermore,we discuss the key challenges and future development directions of fluoro-functionalized polyether electrolytes for solid-state lithium-metal battery applications,and propose practical strategies to address these issues. 展开更多
关键词 electrolyte fluorine lithium-metal battery polyether solid-state electrolyte
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Functional Graded PEEK Cellular Lattice as a Bone Implant 认领 引用
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作者 Sabarinathan Palaniyappan Narain Kumar Sivakumar +1 位作者 Ammar Alsheghri Ahmed S.Dalaq 《Journal of Bionic Engineering》 SCIE EI CSCD 2026年第3期1751-1769,共19页
Poly-Ether-Ether-Ketone(PEEK)emerges as a reliable thermoplastic used in various orthopedic applications,notably for its mechanical properties and mitigating stress shielding properties.Its thermoplastic nature enable... Poly-Ether-Ether-Ketone(PEEK)emerges as a reliable thermoplastic used in various orthopedic applications,notably for its mechanical properties and mitigating stress shielding properties.Its thermoplastic nature enables 3D printing,allowing the use of established techniques for fabricating Triply Periodic Minimal Surface(TPMS)architectures like Gyroid,Diamond,and Primitive.This study proposes four strategies to explore the Young’s modulus E and ultimate strengthσsdesign space:uniform latticing and three functional grading configurations based on relative density,unit cell size,or their hybrid combination.PEEK-based lattices are fabricated,and deviations between printed samples(as-built)and designed models are evaluated.The apparent mechanical properties:ultimate and yield strength(σs,σY),toughness U,and Young’s modulus E,are estimated.The 3D-printed samples demonstrated high fabrication fidelity,with sheet thickness deviations of~9.5%for uniform and~7-17%for graded lattices.In situ tracking of spatial variations within unit cells reveals how grading influences Poisson’s ratio and auxetic behavior.Overall,PEEK scaffolds achieve E values within~7%of trabecular bone and exceed its strength by over>11.8 times.To objectively assess property matching,we introduce a Bone Matching Index using radar plots to quantify deviations inσs,σY,E,and U.Among TPMS architectures,Gyroid matches trabecular bone most closely in E,while the hybrid Primitive configuration shows the most balanced mechanical response and highest index. 展开更多
关键词 Polyether ether ketone Architected materials TPMS lattice Implicit fields 3D printing
Core-Shell Structure Strategy to Prepare Super-tough Poly(lactic acid)Composites with Balanced Stiffness and Toughness 认领 引用
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作者 Wei Bao Xiaodong Wang +5 位作者 Lei Li Jing Jin Yanxiong Pan Hongwen Liang Xiangling Ji Wei Jiang 《Polymer Science & Technology》 CAS 2026年第7期505-514,共10页
Super-tough poly(lactic acid)(PLA)composites with an excellent balance between stiffness and toughness were successfully developed by incorporating core-shell particles comprising a rigid silica(SiO2)core and an el... Super-tough poly(lactic acid)(PLA)composites with an excellent balance between stiffness and toughness were successfully developed by incorporating core-shell particles comprising a rigid silica(SiO2)core and an elastomeric poly(ether-block-amide)grafted with a glycidyl methacrylate(PEBA-GMA)shell.Morphological observations confirmed the formation of a well-defined core-shell structure within the PLA matrix.The effects of SiO2 particle size(100–800 nm)and core-shell mass ratio(1:3 to 3:1)on mechanical properties were systematically investigated.The results indicate that smaller SiO2 core particles(100 nm)led to severe agglomeration and poor dispersion,resulting in ineffective toughening.The optimal performance was achieved with PLA composites containing 500 nm SiO2 at a core-shell ratio of 1:3 and a total modifier content of 20 wt%,which exhibited a notched Izod impact strength of 70.6 kJ/m2─a significant enhancement over binary PLA/PEBA-GMA composites.Furthermore,this composite maintained ductile fracture behavior even at a high SiO2 content,with an impact strength of 33.9 kJ/m2 at a SiO2:PEBA-GMA core-shell ratio of 3:1.The flexural modulus of this optimized composite was retained at 87%of that of pure PLA,demonstrating an excellent balance between stiffness and toughness.This work presents an effective strategy for developing high-performance PLA materials with tailored mechanical properties,offering promising potential for advanced biodegradable applications. 展开更多
关键词 Poly(lactic acid) balanced stiffness and toughness,core-shell structure polyether block amide melt blending
A design strategy for long-term stability of porous PEEK implants by regulation of porous structure and in vivo mechanical stimulation 认领 引用 被引量：1
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作者 Yingjie Liu Ling Wang +9 位作者 Jie Zhang Shuguang Liu Jibao Zheng Jianfeng Kang Enchun Dong Changning Sun Ruhan A Chaozong Liu Chuncheng Yang Dichen Li 《Bio-Design and Manufacturing》 SCIE EI CAS CSCD 2025年第2期275-287,I0004,共13页
The bioinert nature of polyether ether ketone(PEEK)material limits the widespread clinical application of PEEK implants.Although the porous structure is considered to improve osseointegration of PEEK implants,it is ha... The bioinert nature of polyether ether ketone(PEEK)material limits the widespread clinical application of PEEK implants.Although the porous structure is considered to improve osseointegration of PEEK implants,it is hardly used due to its mechanical properties.This study investigated the combined influence of the porous structure and in vivo mechanical stimulation on implantation safety and bone growth based on finite element analysis of the biomechanical behavior of the implantation system.The combined control of pore size and screw preloads allows the porous PEEK implant to achieve good osseointegration while maintaining a relatively high safety level.A pore size of 600μm and a preload of 0.05 N·m are the optimal combination for the long-term stability of the implant,with which the safety factor of the implant is>2,and the predicted percentage of effective bone growth area of the bone-implant interface reaches 97%.For further clinical application,PEEK implants were fabricated with fused filament fabrication(FFF)three-dimensional(3D)printing,and clinical outcomes demonstrated better bone repair efficacy and long-term stability of porous PEEK implants compared to solid PEEK implants.Moreover,good osteointegration performance of 3D-printed porous PEEK implants was observed,with an average bone volume fraction>40%three months after implantation.In conclusion,3D-printed porous PEEK implants have great potential for clinical application,with validated implantation safety and good osseointegration. 展开更多
关键词 Porous polyether ether ketone(PEEK)implant Osteointegration Interface biomechanics Maxillofacial implants Finite element analyses Fused filament fabrication(FFF)3D printing
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Propylene epoxidation with hydrogen peroxide 认领 引用
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作者 Changjiu Xia Xingtian Shu 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2025年第6期869-871,I0018,共3页
Propylene oxide(PO),with its reactive three-membered epoxide functional group,exhibits remarkable functional versatility and serves as a crucial bridge connecting the gaps between fossil energy utilization and chemica... Propylene oxide(PO),with its reactive three-membered epoxide functional group,exhibits remarkable functional versatility and serves as a crucial bridge connecting the gaps between fossil energy utilization and chemical intermediate generation for new material innovation [1].For instance,PO's downstream derivatives,such as polyether polyols,carbonic esters,and polyurethanes,are widely utilized in wind power generation,battery electrolytes,solar cells,and CO2-based degradable polymers,contributing to sustainable decarbonization in industry [2]. 展开更多
关键词 new material innovation propylene epoxidation propylene oxide po polyether polyolscarbonic estersand wind power generationbattery electrolytessolar cellsand fossil energy utilization propylene oxide hydrogen peroxide
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Dha Tab-COF filled PEBAX mixed matrix membranes for effective CO2/CH4separation 认领 引用 被引量：2
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作者 Yuankai Pan Xingmei Zhang +2 位作者 Wenwen He Lan Zheng Xiaolong Han 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第1期123-134,共12页
Covalent organic skeletons(COFs)have been widely used in gas separation due to their excellent pore structure,high crystallinity,and high specific surface area.In this work,Dha Tab-COF was synthesized by solvothermal ... Covalent organic skeletons(COFs)have been widely used in gas separation due to their excellent pore structure,high crystallinity,and high specific surface area.In this work,Dha Tab-COF was synthesized by solvothermal method and filled in polyether block polyamide(PEBAX)to form mixed matrix membranes(MMMs).Various characterization methods such as Fourier transform infrared spectroscopy(FT-IR),Xray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM)and X-ray diffractometry(XRD)were used to characterize the structure of Dha Tab-COF as well as the MMMs.The effects of operating pressure,operating temperature and the content of Dha Tab-COF particles on the CO2/CH4separation performance of the membranes were investigated.The best separation performance with a CO2permeability of 295.8 barrer(1 barrer=7.52×10-18m3·(STP)·m-2·m·s-1·Pa-1)and a CO2/CH4selectivity of 21.6 was achieved when the Dha Tab-COF content is 2%(mass),which were 45.7%and 108.1%higher than that of the pure PEBAX membrane,respectively. 展开更多
关键词 Covalent organic framework(COFs) Polyether block polyamide(PEBAX) Mixed matrix membranes CO2separation membrane
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Ring-closing-opening Copolymerization of Phthalaldehyde and Epoxide towards Acid-degradable Polyether and Polyurethane 认领 引用
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作者 Jie Pang Yu-Bo Zhou +2 位作者 Li-Jun Liu Hong-Xin Zhang Jun-Peng Zhao 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第6期964-972,I0009,共9页
Incorporation of acetal groups in the backbone is a potent strategy to create polymers that are cleavable or degradable under acidic conditions.We report here an in-depth study on the ring-closing-opening copolymeriza... Incorporation of acetal groups in the backbone is a potent strategy to create polymers that are cleavable or degradable under acidic conditions.We report here an in-depth study on the ring-closing-opening copolymerization of o-phthalaldehyde(OPA)and epoxide using Lewis pair type two-component organocatalysts for producing acetal-functionalized polyether and polyurethane.Notably,triethylborane as the Lewis acid,in comparison with tri(n-butyl)borane,more effectively enhances the polymerization activity by mitigating borane-induced reduction of the aldehyde group into extra initiating(borinic ester)species.Density functional theory(DFT)calculations present comparable energy barriers of OPA-epoxide cross-propagation and epoxide self-propagation,which is consistent with the experimental finding that an alternating-rich copolymer comprising mostly OPA-epoxide units but also epoxide-epoxide linkages is produced.In particular,when epoxide is added in a large excess,the product becomes a polyether containing acetal functionalities in the central part of the backbone and thus being convertible into polyurethane with refined acid degradability. 展开更多
关键词 Degradable polymer Polyurethane Polyether Anionic polymerization Ring-opening polymerization
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Calcium chloride doped zinc-cobalt metal-cyanide complex:Unexpected highly activity towards ring-opening polymerization of propylene oxide 认领 引用 被引量：2
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作者 Yi Jun Huang Xing Hong Zhang +1 位作者 Zheng Jiang Hua Guo Rong Qi 《Chinese Chemical Letters》 SCIE CAS 2010年第8期897-901,共5页
Highly active calcium chloride（CaCl2） doped Zn-Co^Ⅲdouble metal-cyanide（Ca-DMC） catalysts were firstly reported.Ca-DMCs presented a very higher polymer yield（54 kg polymer/g catalyst） at relative low temperatur... Highly active calcium chloride（CaCl2） doped Zn-Co^Ⅲdouble metal-cyanide（Ca-DMC） catalysts were firstly reported.Ca-DMCs presented a very higher polymer yield（54 kg polymer/g catalyst） at relative low temperature（80-115℃） toward ringopening polymerization（ROP） of propylene oxide（PO） than did DMC catalysts without modification. 展开更多
关键词 Catalysts Polyethers Ring-opening polymerization Metal-cyanide complex
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Damping Properties of Flexible Epoxy Resin 认领 引用 被引量：5
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作者 WANG Xiang LIU Hanxing OUYANG Shixi 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2008年第3期411-414,共4页
Amino-terminated polyethers and amino-terminated polyurethane were used as curing agent to cure the epoxy resin together and get a series of cured products.The damping properties of the composites were studied by DMA ... Amino-terminated polyethers and amino-terminated polyurethane were used as curing agent to cure the epoxy resin together and get a series of cured products.The damping properties of the composites were studied by DMA test at different measurement frequencies.Damping mechanical tests show that the flexible epoxy resin has higher loss factor than common epoxy.The highest loss factor reaches 1.57.Also the height and position of loss factor peak of the flexible epoxy resin varies by changing the content of amino-terminated polyethers.Results shows that the flexible epoxy resin can be used as damping polymer materials at room temperature or in common frequency range. 展开更多
关键词 flexible epoxy damping properties amino-terminated polyethers amino-terminated polyurethane
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Molding of polyether ether ketone(PEEK)and its composites:a review 认领 引用 被引量：19
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作者 Zhengchuan GUO Junjie HE +4 位作者 Ruoxiang GAO Yifeng PAN Chengqian ZHANG Jianzhong FU Peng ZHAO 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2024年第10期788-823,共36页
Over the last half-century,polyether ether ketone(PEEK)has emerged as a widely adopted thermoplastic polymer,primarily due to its lower density,exceptional mechanical properties,high-temperature and chemical resistanc... Over the last half-century,polyether ether ketone(PEEK)has emerged as a widely adopted thermoplastic polymer,primarily due to its lower density,exceptional mechanical properties,high-temperature and chemical resistance,and biocompatibility.PEEK and its composites have found extensive applications across various fields,including machinery,aerospace,military equipment,electronics,and biomedicine,positioning themselves as promising substitutes for traditional metal structures.Nevertheless,achieving optimal performance and functional molding of PEEK and its composites presents a formidable challenge,given their inherent characteristics,such as semi-crystallinity,high melting temperature,heightened viscosity,low dielectric coefficient,and hydrophobic properties.In this paper,we present a comprehensive review of the molding methods and processes of PEEK and its composites,including extrusion molding,hot compression molding,injection molding,and 3D printing.We also introduce typical innovative applications within the fields of mechanics,electricity,and biomedicine while elucidating methodologies that leverage the distinctive advantages of PEEK and its composites.Additionally,we summarize research findings related to manipulating the properties of PEEK and its composites through the optimization of machine parameters,process variables,and material structural adjustments.Finally,we contemplate the prevailing development trends and outline prospective avenues for further research in the advancement and molding of PEEK and its composites. 展开更多
关键词 Polyether ether ketone(PEEK) Composites Extrusion molding Hot compression molding Injection molding 3D printing
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Synthesis of waterborne polyurethane using snow as dispersant:Structures and properties controlled by polyols utilization 认领 引用 被引量：5
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作者 Changqing Fang Shaofei Pan +3 位作者 Zhen Wang Xing Zhou Wanqing Lei Youliang Cheng 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2019年第7期1491-1498,共8页
waterborne polyurethane (WPU) dispersions have gained attention towards environm entally-friendly synthesis. In this article, a series of waterborne polyurethane em ulsions was successfully synthesized and extensively... waterborne polyurethane (WPU) dispersions have gained attention towards environm entally-friendly synthesis. In this article, a series of waterborne polyurethane em ulsions was successfully synthesized and extensively characterized in terms of thermal, mechanical properties, hydrophilic behavior and morphology. Snowwas chosen as dispersant instead of comm only used water. Preparation param eters such as intrinsic properties and molecular weight of polyols were discussed systematically. A chain structure was confirmed by Fourier transform infrared (FT-IR) spectroscopy. when com paring the nature of the polyols (PPG, PEG and PNA, 2000g/mol) of this study, as-synthesized polyether waterborne polyurethane provided higher solid content, viscosity and water-resistance. However, polyester waterborne polyurethane perform ed differently and it exhibited higher therm al stability and crystallinity. When com paring the samples (WPU-N210, WPU-N220, WPU-N230 and WPU-N240) with different molecular weight of the same polyol (PPG) used as soft segment, the emulsion WPU-N220 with molecular weight of 2000g/mol PPG provided the highest solid content and lowest viscosity. It was observed th at particle size was uniform and highly dispersed for all sam ples from TEM images. Therm ogravim etric, differential scanning calorim etry (DSC) and X-ray diffraction results dem onstrated that the emulsion WPU-N230 with m olecular weight of 3000 g/mol PPG possessed higher therm al stability and crystallinity than the other samples. The reason was that the Tg and thermal stability were increased with increasing molecular weight. when molecular weight increased, the arrangem ent of soft segm ent became more regular and so did the regularity of the molecular chains. This work demonstrated that different polyols as soft segment applied could lead to great differences in the structure and property of the resulting WPU. 展开更多
关键词 Waterborne polyurethane (WPU) Snow Soft segment Polyester Polyether
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SYNTHESIS OF A HYPERBRANCHED POLYETHER EPOXY THROUGH ONE-STEP PROTON TRANSFER POLYMERIZATION AND ITS APPLICATION AS A TOUGHENER FOR EPOXY RESIN DGEBA 认领 引用 被引量：5
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作者 Jian-yong Lv Yan Meng +2 位作者 Li-fan He Xiao-yu Li Hai-qiao Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2012年第4期493-502,共10页
A novel liquid hyperbranched polyether epoxy(HBPEE)based on commercially available hydroquinone(HQ)and 1,1,1-trihydroxymethylpropane triglycidyl ether(TMPGE)was synthesized through an A2+B3 one-step proton transfer po... A novel liquid hyperbranched polyether epoxy(HBPEE)based on commercially available hydroquinone(HQ)and 1,1,1-trihydroxymethylpropane triglycidyl ether(TMPGE)was synthesized through an A2+B3 one-step proton transfer polymerization.In order to improve the toughness,the synthesized HBPEE was mixed with diglycidyl ether of bisphenol A(DGEBA)in different ratios to form hybrids and cured with triethylenetetramine(TETA).Thermal and mechanical properties of the cured hybrids were evaluated.Results show that addition of HBPEE can improve the toughness of cured hybrids remarkably at〈20 wt%loading,without compromising the tensile strength.However,the glass transition temperature(Tg)of the cured hybrids decreases with increasing HBPEE content.Fracture surface images from scanning electron microscope show oriented fibrils in hybrids containing HBPEE.The formation and orientation of the fibrils can absorb energy under impact and lead to an improvement of toughness.Furthermore,based on the morphology of fractured surfaces and the single Tg in each hybrid,no sign of phase separation was found in the cured hybrid systems.As a result,the toughening mechanism could be explained by in situ homogeneous toughening mechanism rather than phase separation mechanism. 展开更多
关键词 Hyperbranched Epoxy Polyether Toughening Proton transfer polymerization.
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Combustion of nitrate ester plasticized polyether propellants 认领 引用 被引量：8
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作者 Xiao-ting YAN Zhi-xun XIA +1 位作者 Li-ya HUANG Xu-dong NA 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS CSCD 2020年第10期834-847,共14页
Nitrate ester plasticized polyether(NEPE)is a kind of high-energy solid propellant that has both good mechanical properties and high specific impulse.However,its unique composition makes its combustion mechanism diffe... Nitrate ester plasticized polyether(NEPE)is a kind of high-energy solid propellant that has both good mechanical properties and high specific impulse.However,its unique composition makes its combustion mechanism different from both double-base propellants and composite propellants.In order to study the combustion mechanism of NEPE propellants,we improved the free radical cracking model of previous research to make it capable of predicting the burning rate of NEPE propellants.To study the combustion characteristics and provide data support for the model,an experimental system was built and four kinds of NEPE propellants with different compositions and grain size distributions were tested.The results show that our modified model can reflect the combustion characteristics of NEPE propellants with an acceptable accuracy.The difference between the model and the experimental data is mainly caused by uncertain environmental factors and the ignorance of interactions between components.Both the experimental data and the results predicted by the model show that increasing the backpressure helps to increase the burning rate of NEPE propellants.Furthermore,the grain size of the oxidizer inside the NEPE propellant has a more severe impact on the burning rate but a lighter impact on the burning rate pressure exponent in comparison with the grain size of aluminum.For aluminum-free NEPE propellants,the reaction in the gas phase is dominant in the combustion process while adding aluminum into the propellant makes the solid phase dominant in the final stage.The combustion of fine aluminum particles near the burning surface generates heat feedback to the burning surface which evidently influences the surface temperature.However,the agglomeration of coarse aluminum particles has little effect on the burning surface temperature. 展开更多
关键词 Nitrate ester plasticized polyether(NEPE)propellant Combustion Free radical model Burning rate
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Effects of Soft Monomers on the Water Resistance and Moisture Permeability of Hydrophilic Polyurethane 认领 引用 被引量：7
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作者 QUAN Heng XING Jianwei GU Zhenya 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第5期789-794,共6页
Six groups of segmented polyurethanes with amorphous soft segment domains based on mixed hydrophobic polyester and hydrophilic polyether soft monomers were prepared from 4,4′diphenylmethane diisocyanate(MDI),polybuty... Six groups of segmented polyurethanes with amorphous soft segment domains based on mixed hydrophobic polyester and hydrophilic polyether soft monomers were prepared from 4,4′diphenylmethane diisocyanate(MDI),polybutylene adipate glycol 2000(PBA2000),polytetramethylene glycol 1000(PTMG1000)and polyethylene glycol 1000(PEG1000)with 1,4-butanediol(BDO)as the chain extender.Furthermore,the representative properties of the hydrophilic polyurethanes,moisture permeability and water resistance,were investigated.The results show that the chemical structure,molecular weight and concentration of soft monomers have remarkable effects on the main application properties of hydrophilic polyurethane.The important factors in diffusion are the content of hydrophilic ether bond and the mobility of hydrophilic chain in the soft phase,which is represented with a good approximation by the average mean molecular weight of soft segment.On the contrary,the functional properties of the hydrophilic polyurethane are almost not affected by its hard segment. 展开更多
关键词 hydrophilic polyurethane polyether polyester waterproof breathable
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