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IONIC CONDUCTIVITY IN THE COMPLEXES OF COMB-SHAPED POLYETHER WITH LITHIUM AROMATIC SULFONATE 认领 引用
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作者 张升水 仇卫华 +1 位作者 薛大翠 刘庆国 《Chinese Journal of Polymer Science》 SCIE EI CAS 1993年第3期267-272,共6页
Complexes of comb-shaped polyether and lithium aromatic sulfonates bearing different negative charge number were prepared by in situ thermal polymerization. Their conductivity depends deeply on salt content, ambient t... Complexes of comb-shaped polyether and lithium aromatic sulfonates bearing different negative charge number were prepared by in situ thermal polymerization. Their conductivity depends deeply on salt content, ambient temperature and negative charge number of the added salts. Results show that anions can be partly immobilized by increasing their negative charges at lower temperature. Against discharge time the short circuit current of the battery (Li/complex film/Li_x V_3O_8) is stabilized by increasing the anionic charge number of the complex. 展开更多
关键词 Polymeric solid electrolyte Ionic conductivity Comb-shaped polyether Lithium battery
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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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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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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 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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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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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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Accelerated Approach to the Synthesis of Fluoriated Polyether Dendrimers 认领 引用 被引量：1
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作者 Cao, XP Li, XH +1 位作者 Chow, HF Li, Y 《Chinese Chemical Letters》 SCIE CAS 1998年第9期809-812,共4页
Fluorinated polyether dendritic sectors 4, 7 and 10 from the first to the third generations, respectively, were prepared by a convergent approach from readily available pentafluorophenol, phloroglucinol and 1,3-dibrom... Fluorinated polyether dendritic sectors 4, 7 and 10 from the first to the third generations, respectively, were prepared by a convergent approach from readily available pentafluorophenol, phloroglucinol and 1,3-dibromopropane. These dendritic sectors have good solubility properties and are stable in both acidic and basic media. Hence they are useful dendritic building blocks for the preparation of functional dendrimers. 展开更多
关键词 synthesis fluoriated polyether dendrimers
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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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Novel Silica Gel Supported Polyether Ionic Liquids: Efficient Catalysts Applied in Transformation of Carbon Dioxide 认领 引用 被引量：1
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作者 Guo Liying Jin Xianchao +1 位作者 Wang Yirong Wang Haozhi 《China Petroleum Processing & Petrochemical Technology》 CAS 2018年第4期60-66,共7页
Three new catalysts based on the silica gel supported polyether ionic liquids(ILs), i.e., [HO-PECH-MIM]ClSi, [H2N-PECH-MIM]Cl-Si, and [HOOC-PECH-MIM]Cl-Si, were prepared, and their chemical structures were characteriz... Three new catalysts based on the silica gel supported polyether ionic liquids(ILs), i.e., [HO-PECH-MIM]ClSi, [H2N-PECH-MIM]Cl-Si, and [HOOC-PECH-MIM]Cl-Si, were prepared, and their chemical structures were characterized by infrared(IR) spectroscopy and nuclear magnetic resonance(NMR) spectroscopy. Thermogravimetric analyzer(TG), X-ray diffractometer(XRD) and scanning electron microscope(SEM) were used to evaluate their thermal stability,crystalline structure and apparent morphology, respectively. Surface areas of the prepared catalysts were calculated by the Brunauer-Emmett-Teller(BET) method. The catalytic reaction for the synthesis of propylene carbonate(PC) using CO_2 and propylene oxide(PO) in the presence of the prepared catalysts was studied. The influences of times of recycling and catalyst structure on catalytic performance were also investigated. The experimental results showed that the silica gel supported polyether ILs catalysts successfully prepared under mild condition could possess the advantages of high activity, excellent thermal stability, good selectivity and easy recycling, while the phase transition of the liquid polyether ILs catalysts was also achieved. When the reaction temperature was 90 °C, the CO_2 pressure was 2.0 MPa and the dosage of the catalyst was 2.5%, [HOOC-PECH-MIM]Cl-Si was found to have the best catalytic performance in the catalytic process, with the conversion rate reaching 100% and the selectivity equating to 98.2%. The conversion rate and selectivity still could reach more than 90% even after the catalyst was reused for 15 times. 展开更多
关键词 .polyether ionic liquids silica gel catalyst CO2
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A Structure-properties Study of MDI-based Hydrophilic Polyether-polyester Polyurethane 认领 引用 被引量：1
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作者 权衡 顾振亚 吴穗生 《Journal of Donghua University(English Edition)》 EI CAS 2009年第4期408-412,共5页
A series of segmented polyether-polyester polyurethane with amorphous hydrophilic soft segment domains were prepared from 4,4'- diphenylmethane diisocyanate (MDI), polybutylene adipate (Glycol) 2000 (PBA2000), and... A series of segmented polyether-polyester polyurethane with amorphous hydrophilic soft segment domains were prepared from 4,4'- diphenylmethane diisocyanate (MDI), polybutylene adipate (Glycol) 2000 (PBA2000), and polyethylene glycol 1000 (PEG1000), with 1,4-butanediol (BDO) as the chain extender. Furthermore, several representative properties of the polyurethanes, such as moisture permeability, water resistance, hydrophilic property, and phase inversion temperature, were investigated. The studies show that the structure and concentration of soft segment have a remarkable effect on the main application properties of polyurethane. On the contrary, the functional properties of the polyurethane are almost not affected by its hard segment. 展开更多
关键词 hydrophilic polyurethane polyether polyester structure property
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IMMOBILIZATION OF POTENTIALLY BIOACTIVE MOIETIES ONTO POLYETHER WITH POLY(ETHYLENE GLYCOL)-SULFONATE SPACER 认领 引用
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作者 计剑 封麟先 +2 位作者 邱永兴 俞小洁 杨士林 《Chinese Journal of Polymer Science》 SCIE EI CAS 1997年第2期180-186,共7页
A new reactive graft copolymer, poly(tetramethylene glycol)-graft-omega-propyl sodium sulfonate-poly(ethylene glycol) (PTMG-g-PEG-CH2CH2CH2SO3-Na+), was synthesized by the cationic polymerization of alpha-omega-bifunc... A new reactive graft copolymer, poly(tetramethylene glycol)-graft-omega-propyl sodium sulfonate-poly(ethylene glycol) (PTMG-g-PEG-CH2CH2CH2SO3-Na+), was synthesized by the cationic polymerization of alpha-omega-bifunctional PEG macromonomer ((sic)CH2-PEG-CH2CH2CH2SO3Na) and THF. The obtained copolymer exhibits the expected structure as indicated by the result of characterization. Two amino acids (L-arginine, L-tyrosine) were covalently attached to the copolymer after converting the sulfonate group, to sulfonyl chloride. So the new reactive graft copolymer (PTMG-g-PEG-CH2CH2CH2SO3-Na+) is expected to be very useful in attachment of potentially bioactive moieties to polymer via a hydrophilic PEG spacer. 展开更多
关键词 potentially bioactive moieties polyether biocompatible materials
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IONIC CONDUCTIVITIES OF SEGMENTED POLYETHER POLYURETHANEUREA COMPLEXES WITH LiClO_4 认领 引用
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作者 顾庆超 徐炜政 +1 位作者 叶温温 莫天麟 《Chinese Journal of Polymer Science》 SCIE EI CAS 1991年第3期189-194,共6页
Ionic conductivity values for segmented polyether polyurethaneurea (PEUU) complexes with LiClO_4 were determined and values as high as～1.1×10-4 S·cm-1 at 353K and～1.0×10-5S·cm-1 at 30... Ionic conductivity values for segmented polyether polyurethaneurea (PEUU) complexes with LiClO_4 were determined and values as high as～1.1×10-4 S·cm-1 at 353K and～1.0×10-5S·cm-1 at 306K were achieved. The ionic conductivity data were analyzed using the VTF (Vogel-Tamman-Fulcher) equation and WLF (Williams-Landel-Ferry) type equation. Values have been estimated for the 'apparent' activation energies of ion transport from VTF equation and they lie in the range 2.70—5.53 kJ·mol-1. 展开更多
关键词 Segemented polyether polyurethaneureas Complex: Solid ionic conductor Ionic conductivity VTF (Vogel-Tamman-Fulcher) equation WLF equation
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SOLID-STATE VARIABLE-TEMPERATURE NMR STUDY ON THE PHASE SEPARATION OF POLYETHER POLYURETHANE ZWITTERIONOMERS 认领 引用
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作者 杨光 陈群 +2 位作者 王源身 杨昌正 邬学文 《Chinese Journal of Polymer Science》 SCIE EI CAS 1994年第4期302-308,共7页
Polyether-polyurethane zwitterionomers based on 4, 4'-diphenylmethane diisocyanate(MDI), methyl diethanolamine (MDEA), and polytetramethylene oxide glycol (PTMO) werestudied with variable-temperature wide-line ~1H... Polyether-polyurethane zwitterionomers based on 4, 4'-diphenylmethane diisocyanate(MDI), methyl diethanolamine (MDEA), and polytetramethylene oxide glycol (PTMO) werestudied with variable-temperature wide-line ~1H NMR. It is found that upon ionization, degree ofphase separation in the polymer system decreased at first due to the loss of hard segmentregularity, while further ionization increased the degree of phase separation through increasinghard phase cohesion and difference of polarity between hard and soft segments. 展开更多
关键词 Polyether polyurethane Variable temperature Wide-line NMR Phase separation
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SYNTHESES OF POLYSTYRENE RESINS CONTAINING POLYETHER OLIGOMERS AND THEIR EXTRACTION FOR GOLD (Ⅲ) 认领 引用
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作者 董世华 刘石 徐羽梧 《Chinese Journal of Polymer Science》 SCIE EI CAS 1994年第1期49-56,共8页
Three polystyrene resins containing polyether oligomers as extractants were synthesized andtheir extraction properties were studied. Gold (III) ion could be extracted rapidly by the resins(T1/2,<lmin. )with high... Three polystyrene resins containing polyether oligomers as extractants were synthesized andtheir extraction properties were studied. Gold (III) ion could be extracted rapidly by the resins(T1/2,<lmin. )with high efficiency and capacity (for LS-B resin that were 99. 8% and 95. 8mg/gRrespectively) from aqueous solution but most of the co-existing metal ions such as Pd (II),Cu(II), Zn (II), Pb (II) and Cd (II) were remained. The extraction capacity and strippingpercentage for gold (III) remained unchanged in four extraction-stripping cycles. The resins also showed good column extraction-elution properties. 展开更多
关键词 Gold polyether oligomer Levextrel-type resin
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Pyrolysis-Gas Chromatography/Mass Spectrometry for Microstructure and Pyrolysis Pathway of Polyester-Polyether Multiblock Copolymer 认领 引用
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作者 罗爱芹 叶玲 +2 位作者 傅若农 谢桂阳 王显伦 《Journal of Beijing Institute of Technology》 EI CAS 2001年第1期45-50,共6页
The composition and sequence distribution of monomeric units in polyester polyether multiblock copolymer were studied by pyrolysis? gas chromatography (PGC) and pyrolysis gas chromatography/mass spectrometry (PGC/MS).... The composition and sequence distribution of monomeric units in polyester polyether multiblock copolymer were studied by pyrolysis? gas chromatography (PGC) and pyrolysis gas chromatography/mass spectrometry (PGC/MS). PGC was applied to study the F t curve of the multiblock copolymer and PGC/MS was used to separate and identify the pyrolyzates. DTA experiment was used to study the decomposition temperature. The results show that the beginning point of elastomer’s decomposition was about 300?℃ and the decomposition temperature of most of the sample was 550?℃. Many pyrolyzates were produced because of the breaking of weak bonds in the sample. The possible microstructure was verified and the pyrolysis pathway of the copolymer was investigated. 展开更多
关键词 thermoplastic elastomer polyester polyether multiblock copolymer pyrolysis gas chromatography/mass spectrometry copolymer pyrolysis pathway microstructure pyrolyzates
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STUDIES ON THE SEGMENTAL STRUCTURE OF POLYESTER-POLYETHER 认领 引用
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作者 陈传福 王身国 +3 位作者 李学芬 李执芬 冀克俭 李立璞 《Chinese Journal of Polymer Science》 SCIE EI CAS 1989年第2期143-149,共7页
In this paper the change of segment ratio, segmental sequence distribution and randonmess B of PET-PTMG block copolymer have been investigated by IR and 13C-NMR spectra during the polycondensation reaction.
关键词 Polyester-polyether block copolymer Segmental structure Sequence distribution Probability Randomness.
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SYNTHESIS AND CHARACTERIZATION OF A FLAME RETARDANT HYPERBRANCHED POLYETHER 认领 引用 被引量：1
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作者 Jyotishmoy Borah 汪传生 Niranjan Karak 《Chinese Journal of Polymer Science》 SCIE EI CAS 2010年第1期107-118,共12页
A brominated hyperbranched polyether has been synthesized from cyanuric chloride and sodium salt of tetrabromobisphenol-A by an A2 ＋ B3 approach. The synthesized polyether was characterized by ^1H-NMR, ^13C-NMR, UV, ... A brominated hyperbranched polyether has been synthesized from cyanuric chloride and sodium salt of tetrabromobisphenol-A by an A2 ＋ B3 approach. The synthesized polyether was characterized by ^1H-NMR, ^13C-NMR, UV, FTIR spectroscopy and X-ray diffraction studies, measurements of solution viscosity, molecular weight and solubility and elemental and thermogravimetric analyses. The flame retardancy of the synthesized polyether and its blends with commercially available plasticized poly（vinyl chloride） （PVC） and low density polyethylene （LDPE） was investigated by measurements of limiting oxygen index （LOI） value and thermogravimetric analysis. The properties are compared with a non-halogenated similar type of bisphenol-A based aromatic polyether after blending at different dose levels with the same base polymers. The LOI values of these blends indicated that these hyperbranched polyethers acted as flame retardant additives, and antimony trioxide had prominent synergistic effect with the bromo hyperbranched polyether for the above base polymers, and an increment of 4 to 6 units in LOI values was observed. 展开更多
关键词 Hyperbranched polyether LOI LDPE PVC.
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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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Influence of Hydrogen Bonding on the Temperature-Accelerated Hydrolysis of Silicone Based Polyetherurethane 认领 引用 被引量：2
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作者 He-Cheng Wu Shu-Ren Shao +8 位作者 Shuo-Hong Dong Ao Wang Zhen Li Xiang-Long Han Feng Luo Jie-Hua Li Dai-Guo Zhao Wan-Ling Lan Hong Tan 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2023年第8期1230-1237,I0007,共8页
Temperature-accelerated in vitro degradation was established to estimate the longevity of polyurethane applied for long-term implantation.However,the prediction did not correlate well with the data from clinical expla... Temperature-accelerated in vitro degradation was established to estimate the longevity of polyurethane applied for long-term implantation.However,the prediction did not correlate well with the data from clinical explants and the rationality of accelerated in vitro test is still in a controversial due to the deviation.To improve the accuracy of the in vitro prediction,the influence of hydrogen bonding(HB)on the accelerated hydrolysis of silicone based polyetherurethans(SPEUs)extended with three side chains.Combining the temperature-controlled FTIR and the physical properties after temperature-accelerated in vitro degradation,it was demonstrated that side chain could increase the degree of hydrogen bond dissociation at higher temperature,resulting in the decrease of the calculated activation energy(Ea)of hydrolysis.At low temperatures,changes in surface morphology and molar mass of PEUs are minimal and HB are less easily dissociated,which had barely impact on the hydrolysis resistance.It was proposed that the Ea will not be impacted and that the accuracy of prediction will be increased if the acceleration temperature is lower than 70℃ and HB change is less than 15%. 展开更多
关键词 Polyether urethane Polydimethylsiloxane Activation energy Hydrogen bonding Hydrolysis resistance
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