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Silicon-containing reactive dyes for acidic fixation on cotton and their application in one-bath one-step dyeing of polyester/cotton blends 认领 引用
1
作者 Bin Zhang Wei Ma +3 位作者 Bingtao Tang Zhiping Mao Xiaojun Peng Shufen Zhang 《ENGINEERING Chemical Engineering》 SCIE EI CAS CSCD 2026年第6期61-74,共14页
Traditional reactive dyeing of cotton requires alkali,leading to issues such as dye hydrolysis and challenges in one-bath dyeing of polyester/cotton blends with disperse dyes.To overcome these limitations,a novel acid... Traditional reactive dyeing of cotton requires alkali,leading to issues such as dye hydrolysis and challenges in one-bath dyeing of polyester/cotton blends with disperse dyes.To overcome these limitations,a novel acidic cross-linking strategy was developed using siliconcontaining reactive dyes and the silane coupling agent(3-aminopropyltriethoxysilane,KH550).Under weak acidic conditions(pH=5.0),a three-dimensional"dye-crosslinker-fabric"cross-linking network was successfully constructed through reactions between silanol groups and fabric hydroxyl groups,reactions between the amino groups of KH550 and the reactive groups of the dyes,and self-condensation of silanol groups,thereby fixing the dyes onto the fabrics.This method achieved high fixation rates of 91.3%96.4%,with excellent wash and rubbing fastness.Furthermore,by selecting matching disperse dyes,one-bath one-step dyeing of polyester/cotton was realized.The thermosol process for disperse dyes did not hinder reactive dye fixation,and KH550 even enhanced disperse dye uptake.Total dye utilization exceeded 90%,with outstanding fastness and levelness.This approach shortens the dyeing process,reduces energy use and effluent load,offering an efficient and eco-friendly alternative for blended fabric dyeing. 展开更多
关键词 silicon-containing reactive dyes acidic fixation cotton one-bath one-step dyeing polyester/cotton blends
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Unconfined compressive strength and small-strain shear modulus of soft marine clay improved by ordinary Portland cement and polyester fibers with modeling by Michaelis-Menten kinetics 认领 引用
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作者 Keeratikan Piriyakul Aruz Petcherdchoo +1 位作者 Koonnamas Punthutaecha Tanakorn Phoo-ngernkham 《Journal of Road Engineering》 EI CAS 2026年第1期134-147,共14页
This study proposes to use the unconfined compressive strength(UCS)and the bender element(BE)tests for determining the strength and the initial small-strain shear modulus of Bangkok soft marine clay improved by cement... This study proposes to use the unconfined compressive strength(UCS)and the bender element(BE)tests for determining the strength and the initial small-strain shear modulus of Bangkok soft marine clay improved by cement and polyester fibers.This study varies the content of admixed cement(1%–20%)and polyester fibers(0–20%),including the curing time(3–28 d)for preparing 360 samples.Moreover,this study uses the Michaelis-Menten kinetics concept to model cement hydration saturation.From the study,it is concluded as follows.The modelled results reveals that at least 10%cement and 1%polyester fiber are recommended to attain the 28-d UCS standards(294 kPa)for highway subgrade materials in Thailand.This also fulfils sustainable construction due to reducing normal-use cement from 20%to 10%.Unfortunately,the addition of polyester fibers into the Bangkok clay with at least 5%cement reduces shear modulus by 1.12–1.32 times.The Abram's relationship between shear modulus and the mixing-water-to-cement ratio is found time-dependent.From the composite theory,the BE detects the polyester fiber zone as a defect in the Bangkok clay(matrix)with 5%–20%cement.So,the 28-d shear modulus in the polyester fiber zone is negative(up to0.034 MPa for 20%fiber),similar to softening phenomenon in concrete cracking(negative stiffness).For the 28-d shear modulus of fiber zone,the optimum cement content is around 2%for the positive influences of polyester fibers.Experimentally,the timedependent normalized UCS for 10%and 20%cement is compatible with other studies,and its development rate increases with the cement content as 0.3017,0.3172 and 0.3204 for 5%,10%and 20%cement,respectively.The 28-d relationship between shear modulus and UCS shows that low-cement soft clay requires high polyester fiber content(5%–20%)to activate UCS improvement.However,the soft clay with enough cement(20%)causes the uniformly distributed UCS improvement. 展开更多
关键词 Bangkok soft marine clay Unconfined compressive strength Small-strain shear modulus Bender elements Polyester fibers Michaelis-Menten kinetics
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Achieving Simultaneous High Thermal Stability and Rapid Seawater Degradation in Poly(butylene succinate-co-glycolide)Copolyesters 认领 引用
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作者 Yu-Hao Wang Jie Wang +4 位作者 Shi-Hong Gong Dian-Hao Li Bao-Jun Luo Chao Wei Chun-Lei Zhang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第3期653-663,I0008,共11页
Ocean-degradable polyesters incorporating hydrophilic and rapidly degradable glycolide(GL)units into the polymer chain are the most promising for addressing marine plastic pollution,however,it is challenging to obtain... Ocean-degradable polyesters incorporating hydrophilic and rapidly degradable glycolide(GL)units into the polymer chain are the most promising for addressing marine plastic pollution,however,it is challenging to obtain high-molecular-weight copolymers with narrow molecular weight distributions.Herein,we prepared a novel biodegradable material,poly(butylene succinate-co-glycolide)(PBSGL),through ring-opening copolymerization using glycolide,succinic anhydride,and 1,4-butanediol as raw materials,providing a new solution strategy for marine pollution.GL could be polymerized according to the pre-designed composition by 1H-nuclear magnetic resonance(1H-NMR)and gel permeation chromatography(GPC)results,indicating controlled polymerization with the synthesized PBSGLs having a weight-average molecular weight of up to 12.30×104 g/mol and a narrow molecular weight distribution(1.33–1.65).Differential scanning calorimeter(DSC)and thermogravimetric analysis(TGA)results showed that Tg of PBSGLs increased from−32.5°C to−26.5°C with the increase of GL content from 0%to 40%,while Tm(>76°C)was much lower than Td,5%(>314°C),which indicated that PBSGLs had good thermal stability and expanded the processing window and application range of the original poly(butylene succinate)(PBS)materials.Under simulated difficult conditions,PBSGL copolyesters could degrade faster with increasing GL content,where PBSGL40 degraded by 22.6%in 12 days,showing good biodegradability.Currently,most biodegradable polyesters with good performance slowly degrade in seawater.In a 30-day artificial seawater degradation test,the amorphous PBSGL40 copolyester showed a about 15-fold(2.33%weight loss)improvement in degradation ability compared to pure PBS,demonstrating rapid seawater degradation capability. 展开更多
关键词 Marine degradation Biodegradable polyesters Poly(butylene succinate-co-glycolide)
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Designable Optical Polyesters via Alternating Copolymerization of Benzaldehyde-derived Cyclic Carbonates and Phthalic Anhydride 认领 引用
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作者 Xue-Lin Song Shun-Jie Liu Xian-Hong Wang 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2026年第7期2136-2143,共8页
We report a platform-based approach for designing of aromatic polyesters with customizable optical properties.By employing a series of benzaldehyde-derived cyclic carbonate monomers,we performed ring-opening alternati... We report a platform-based approach for designing of aromatic polyesters with customizable optical properties.By employing a series of benzaldehyde-derived cyclic carbonate monomers,we performed ring-opening alternating copolymerization with phthalic anhydride to yield structurally regular polyesters featuring diverse substituents.All monomers underwent smooth copolymerization,producing polymers with controlled molecular weights(Mn=21–45 kDa)and narrow dispersity(Đ=1.04–1.28).Thermal analysis revealed decomposition temperatures above 280℃and glass transition temperatures exceeding 90℃,ensuring robust thermal stability.The resulting polyesters showed excellent visible-light transparency,with transmittance greater than 92%between 400–600 nm.Systematic modification of aromatic substituents enabled continuous tuning of refractive indices from 1.563 to 1.622,alongside Abbe numbers ranging from 30.9 to 45.1,highlighting the significant impact of electronic polarizability on optical performance.This work establishes a unified molecular design platform for creating high-performance optical polyesters with predictable and tunable refractive and dispersive properties. 展开更多
关键词 Optical polyester Cyclic carbonate Designable properties
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4-Bromophthalic Anhydride-based Polyesters as a Versatile Modified Platform 认领 引用
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作者 Ming-Xin Niu Chen-Yang Hu +1 位作者 Xuan Pang Xue-Si Chen 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第6期958-963,I0008,共6页
Chemical modification of polymers represents a pivotal method for achieving functionalized polymer materials.However,due to the lack of post-functional handle,the chemical modification of polyester materials remains a... Chemical modification of polymers represents a pivotal method for achieving functionalized polymer materials.However,due to the lack of post-functional handle,the chemical modification of polyester materials remains a significant challenge.Ring-opening copolymerization of cyclic anhydride and epoxides is a powerful approach to synthesize polyesters.In this work,we for the first time demonstrate the functionalizability of polyesters synthesized with brominated anhydride monomers.The post-functionalization is amenable to a wide variety of reactive groups and reactions with high yields.With multiple well-established functionalization pathways of brominated polyester materials and optimized the conditions for the modification reactions,a series of functionalized polyester materials can be obtained with high yields,providing new insights for the research about functionalization of polymers. 展开更多
关键词 Polyesters Bromophthalic anhydride Functionalization Modification
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Recent progress of heterocycle ring-opening(co)polymerization for the synthesis of sequence-controlled block polyesters and polycarbonates 认领 引用
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作者 Hongyu Zhao Chenyang Hu +1 位作者 Xuan Pang Xuesi Chen 《Smart Molecules》 CSCD 2025年第4期1-19,共19页
Aliphatic polyesters and polycarbonates are among the promising sustainable polymers,which exhibit unique degradability and chain-chain interactions owing to their heterofunctionality.However,monocomponent aliphatic p... Aliphatic polyesters and polycarbonates are among the promising sustainable polymers,which exhibit unique degradability and chain-chain interactions owing to their heterofunctionality.However,monocomponent aliphatic polyesters and polycarbonates usually suffer from inferior properties and functionalities.By contrast,precisely modulated block copolymers composed of polyesters and polycarbonates give rise to sustainable materials with tailored performance.An efficient approach to synthesize the block copolymers is the ring-opening(co)polymerization of the heterocycle monomers.Herein,this review presents the heterocycle monomer ring-opening(co)polymerization for the formation of sequence-controlled block polyesters and polycarbonates.Available synthetic strategies,different monomers,monomer combinations and the catalyst systems for the formation of different block polyesters and polycarbonates are summarized. 展开更多
关键词 aliphatic polycarbonates aliphatic polyesters block copolymers heterocycle monomers ring-opening(co)polymerization
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Effect of Heat Treatment on Molecular Mass and Thermal Properties of Thermotropic Liquid Crystal Polyesters 认领 引用 被引量：2
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作者 DONG Shihang CHEN Yufeng +4 位作者 WAN Hai LIANG Yuan HUANG Shuohan WANG Yanping XIA Yumin 《Journal of Donghua University(English Edition)》 CAS 2025年第2期124-135,共12页
The thermotropic liquid crystal polyester(TLCP)fiber is an increasingly important strategic high-performance fiber.In this paper,the TLCP was prepared by two-step melt polymerization using 4-hydroxybenzoic acid(HBA)an... The thermotropic liquid crystal polyester(TLCP)fiber is an increasingly important strategic high-performance fiber.In this paper,the TLCP was prepared by two-step melt polymerization using 4-hydroxybenzoic acid(HBA)and 6-hydroxy-2-naphthoic acid(HNA)as comonomers at a molar ratio of 7∶3.The structure of TLCP was confirmed by the Fourier transform infrared(FTIR)spectrometer and nuclear magnetic resonance(NMR)spectrometer.The thermal and rheological properties of TLCP before and after heat treatment were analyzed systematically by the differential scanning calorimeter(DSC),dynamic mechanical analyzer(DMA)and high-temperature rotational rheometer.The results revealed that the melting temperature,glass transition temperature and melt viscosity of the TLCP increased significantly after heat treatment.It indicates that the crystallization of the TLCP is perfect,and solid-phase condensation occurs during heat treatment,which increases its molecular mass.In conclusion,heat treatment at a temperature below but close to the melting temperature can effectively regulate the structure and properties of the TLCP,and the results of this study can provide a reference for the high strengthening of TLCP fibers. 展开更多
关键词 thermotropic liquid crystal polyester(TLCP) heat treatment viscosity thermal property
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Installation of Multiple Chiral Centers in Aliphatic Polyesters Backbone Enables Unexpected Crystallinity via Asymmetric Catalytic Copolymerization 认领 引用 被引量：1
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作者 Zheng-Fei Liu Bai-Hao Ren +4 位作者 Yi-Shu Fu Jun Yang Yong-Qiang Teng Ye Liu Xiao-Bing Lu 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第6期946-951,I0008,共6页
The asymmetric alternating copolymerization of meso-epoxide and cyclic anhydrides provides an efficient access to enantiopure polyesters.Contrary to the extensive investigation of the stereochemistry resulting from ep... The asymmetric alternating copolymerization of meso-epoxide and cyclic anhydrides provides an efficient access to enantiopure polyesters.Contrary to the extensive investigation of the stereochemistry resulting from epoxide building block,the chirality from anhydride and the configurational match with epoxide remain elusive.Herein,we discover that the bimetallic chromium catalysts have led to an obvious enhancement in terms of reactivity and enantioselectivity for the asymmetric copolymerization of meso-epoxide with various non-symmetric chiral anhydrides.Up to 97%ee was obtained during the asymmetric copolymerization of cyclohexene oxide(CHO)with(R)-methylsuccinic anhydride(R-MSA),and three-or four-carbon chiral centers were simultaneously installed in the aliphatic polyester backbone.In particular,the different combinations of stereochemistry in epoxide and anhydride building blocks considerably affect the thermal properties and crystalline behaviors of the resulting polyesters.This study uncovers an interesting method for regulating polymer crystallinity via matching the chirality of different monomers. 展开更多
关键词 Chirality Bimetallic catalyst Asymmetric copolymerization Aliphatic polyester
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Biobased Polyesters Derived from 2-Methoxyhydroquinone:Impact of Cyclic and Alkyl Chain Segments on Their Thermomechanical Properties,Biodegradability,and Ecotoxicity 认领 引用
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作者 Hao-Ming Xu Zheng-Zai Cheng +2 位作者 Zi-Ting Zhou Lesly Dasilva Wandji Djouonkep Mario Gauthier 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2025年第8期1320-1332,共13页
To enhance the properties of bio-based polyesters,enabling them to more closely mimic the characteristics of terephthalate-based materials,a series of aliphatic-aromatic copolyesters(P1–P4)were synthesized via ... To enhance the properties of bio-based polyesters,enabling them to more closely mimic the characteristics of terephthalate-based materials,a series of aliphatic-aromatic copolyesters(P1–P4)were synthesized via melt polycondensation.Diester monomers M and N were synthesized via the Williamson reaction,using lignin-derived 2-methoxyhydroquinone,methyl 4-chloromethylbenzoate,and methyl chloroacetate as starting materials.Hydroquinone bis(2-hydroxyethyl)ether(HQEE)and 1,4-cyclohexanedimethanol(CHDM)were employed as cyclic segments,while 1,4-butanediol(BDO)and 1,6-hexanediol(HDO)served as alkyl segments within the copolymer structures.The novel copolyesters exhibited molecular weights(Mw)in the range of 5.25×104–5.87×104 g/mol,with polydispersity indices spanning from 2.50–2.66.Evaluation of the structural and thermomechanical properties indicated that the inclusion of alkyl segments induced a reduction in both crystallinity and molecular weight,while significantly improving the flexibility,whereas cyclic segments enhanced the processability of the copolyesters.Copolyesters P1 and P2,due to the presence of rigid segments(HQEE and CHDM),displayed relatively high glass transition temperatures(Tg>80℃)and melting temperatures(Tm>170℃).Notably,P2,incorporating CHDM,exhibited superior elongation properties(272%),attributed to the enhanced chain mobility resulting from its trans-conformation,while P1 was found to be likely brittle owing to excessive chain stiffness.Biodegradability assessment using earthworms as bioindicators revealed that the copolyesters demonstrated moderate degradation profiles,with P2 exhibiting a degradation rate of 4.82%,followed by P4 at 4.07%,P3 at 3.65%,and P1 at 3.17%.The higher degradation rate of P2 was attributed to its relatively larger d-spacing and lower toxicity,which facilitated enzymatic hydrolytic attack by microorganisms.These findings highlight the significance of optimizing the structural chain segments within aliphatic-aromatic copolyesters.By doing so,it is possible to significantly enhance their properties and performance,offering viable bio-based alternatives to petroleum-based polyesters such as polyethylene terephthalate(PET). 展开更多
关键词 2-Methoxyhydroquinone Aliphatic-aromatic polyesters Cyclic and alkyl chain segments Biodegradability
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Robust and Reprocessable Biorenewable Polyester Nanocomposites In Situ Catalyzed and Reinforced by Dendritic MXene@CNT Heterostructure 认领 引用
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作者 Hao Wang Jiheng Ding +3 位作者 Hongran Zhao Qinchao Chu Jin Zhu Jinggang Wang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2025年第7期206-222,共17页
Renewable 2,5-furandicarboxylic acid-based polyesters are one of the most promising materials for achieving plastic replacement in the age of energy and environmental crisis.However,their properties still cannot compe... Renewable 2,5-furandicarboxylic acid-based polyesters are one of the most promising materials for achieving plastic replacement in the age of energy and environmental crisis.However,their properties still cannot compete with those of petrochemical-based plastics,owing to insufficient molecular and/or microstructure designs.Herein,we utilize the Ti3C2Tx-based MXene nanosheets for decorating carbon nanotube(CNT)and obtaining the structurally stable and highly dispersed dendritic heterostructured MXene@CNT,that can act as multi-roles,i.e.,polycondensation catalyst,crystal nucleator,and interface enhancer of polyester.The biobased MXene@CNT/polybutylene furandicarboxylate(PBF)(denoted as MCP)nanocomposites are synthesized by the strategy of“in situ catalytic polymerization and hot-pressing”.Benefiting from the multi-scale interactions(i.e.,covalent bonds,hydrogen bonds,and physical interlocks)in hybrid structure,the MCP presents exceptional mechanical strength(≈101 MPa),stiffness(≈3.1 GPa),toughness(≈130 MJ m-3),and barrier properties(e.g.,O20.0187 barrer,CO20.0264 barrer,and H2O 1.57×10-14 g cm cm-2 s Pa)that are higher than most reported bio-based materials and engineering plastics.Moreover,it also displays satisfactory multifunctionality with high reprocessability(90%strength retention after 5 recycling),UV resistance(blocking 85%UVA rays),and solvent-resistant properties.As a state-of-art high-performance and multifunctional material,the novel bio-based MCP nanocomposite offers a more sustainable alternative to petrochemical-based plastics in packaging and engineering material fields.More importantly,our catalysis-interfacial strengthening integration strategy opens a door for designing and constructing high-performance bio-based polyester materials in future. 展开更多
关键词 Bio-based polyesters nanocomposites Dendritic hetero-structured MXene@CNT Catalysis-interfacial strengthening integration High strength and toughness Reprocessability and multifunctionality
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SYNTHESIS OF AN EPOXY-TERMINATED HYPERBRANCHED AROMATIC POLYESTER 认领 引用 被引量：7
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作者 W.J.Feast 《Chinese Journal of Polymer Science》 SCIE EI CAS 2002年第6期585-590,共6页
An epoxy-terminated hyperbranched aromatic polyester (P3) was synthesized from a hyperbranched aromatic polyester containing carboxylic acid end groups (P1), which was derived from the condensation polymerization of t... An epoxy-terminated hyperbranched aromatic polyester (P3) was synthesized from a hyperbranched aromatic polyester containing carboxylic acid end groups (P1), which was derived from the condensation polymerization of the AB(2) monomer, 5-acetoxyisophthalic acid. Polymer P1 was converted into the polymeric acid chloride by reaction with thionyl chloride. The acid chloride was reacted with ethanol and glycidol to form a poly(ethyl ester) (P2) and an epoxy terminated material (P3), respectively. The reaction conditions in each step of these processes had to be controlled very carefully to avoid unwanted cross-linking reactions. The characterization of products and intermediates, including molecular weight distributions and thermal properties, are reported. 展开更多
关键词 hyperbranched polymer hyperbranched aromatic polyester epoxy-terminated hyperbranched aromatic polyester
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PREPARATION OF FUNCTIONAL MATERIALS BY BLENDING COPOLYESTERS WITH PVA AND METAL COMPLEX FORMATION OF POLYMER BLENDS 认领 引用 被引量：1
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作者 汪水平 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 1998年第1期33-41,48,共9页
Copolyesters having secondary and tertiary amine salt groups in the main and side chains are prepared by chemoselective polymerization. These copolyesters are soluble in a 10% aqueous solution of poly(vinyl alcohol) (... Copolyesters having secondary and tertiary amine salt groups in the main and side chains are prepared by chemoselective polymerization. These copolyesters are soluble in a 10% aqueous solution of poly(vinyl alcohol) (PVA) at 90 degree C and act as plasticizer in the blend films cast from the solution. Only a glass transition temperature is observed for all these blends indicating the formation of compatible blends from these polyesters with PVA. These blends exhibit manifold characteristics such as ionic conductivity, complex formation with metal ions, absorption of moisture and color changes. The electric conductivity of the copolyesters and blends is in the range of 10** minus **6 Scm** minus **1. The blends with PVA forms complexes with Cu**2** plus and Co**2** plus . The coordination structure with two chelate rings is suggested for these polymer blend/metal complexes. (Author abstract) 10 Refs. 展开更多
关键词 reactive copolyester amine salt group functional polyester PVA blend polymer metal complex ion conductivity coordination structure
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Effects of Waterborne Elastic Polyester with Different Compositions on the Properties and Compatibility of Maize Starch 认领 引用
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作者 ZHANG Kang ZHENG Yanping +4 位作者 LIN Yi ZHOU Mi ZHU Puxin WU Dacheng CHENG Fei 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2021年第4期465-471,共7页
Waterborne elastic polyester (WEP) with different content of hard polyester was applied in the maize starch (MS) based composites (MS/WEP) via solution casting method.The effects of WEP with different contents of hard... Waterborne elastic polyester (WEP) with different content of hard polyester was applied in the maize starch (MS) based composites (MS/WEP) via solution casting method.The effects of WEP with different contents of hard polyester on the structure and properties of starch were studied by Fourier transform infrared,X-ray diffraction,ultraviolet-visible,tensile test,differential scanning calorimeter,thermogravimetric analysis and moisture measurement.The experimental results show that the addition of WEP does not change the crystalline type of starch,and only reduces the crystallinity of starch.And the structure and properties of MS/WEP are related to not only the content of starch but also the microstructure of WEP or the content of hard polyester in WEP.Waterborne elastic polyester with 30wt% hard polyester (WEP30) has the best modification effect on the maize starch among all the WEPs.For example,MS/WEP30 film has the optimum toughness,aging resistance and transmittance,the lowest crystallinity and glass transition temperature among all the MS/WEP films,and the lower moisture content.It is related to the compatibility between starch and WEP,resulting from the number of physical crosslinking points in WEP.. 展开更多
关键词 maize starch waterborne elastic polyester hard polyester compatibility
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Degradable Polyesters based on Oxygenated Fatty Acid Monomer 认领 引用
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作者 CHENG Zhengzai LI Yi +10 位作者 Lesly Dasilva Wandji Djouonkep ZENG Sheng WANG Huan WANG Linfeng CAI Shuanpu LIU Panpan HU Hai YANG Yingao LI Jiaqi QIN Jisong Mario Gauthier 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2022年第4期753-759,共7页
A series of degradable polyesters was synthesized via melt polymerization of 3,6-dioxaoctane-1,8-dioic acid and five different diols,catalyzed by antimony trioxide(Sb2O3).The polymers were characterized by FT-IR... A series of degradable polyesters was synthesized via melt polymerization of 3,6-dioxaoctane-1,8-dioic acid and five different diols,catalyzed by antimony trioxide(Sb2O3).The polymers were characterized by FT-IR and 1H NMR spectroscopy,gel permeation chromatography(GPC)and differential scanning calorimetry(DSC)analysis.The polydispersity index(PDI=Mw/Mn)of the polyesters ranged from 1.55 to 1.99,the weight-average molecular weight(Mw)from 1.8×104 to 3.2×104 Da,the melting point from 63 to 123℃,and the highest decomposition temperature observed was 363℃.The influence of the structure of the polymer chain on hydrolytic degradability was investigated with tests performed at three different values of pH.The findings obtained provide useful insight for the molecular design and the synthesis of degradable polyesters. 展开更多
关键词 degradable polyesters melt polymerization thermal properties aliphatic-aromatic polyester
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CNTs/Polyester复合材料的微波吸收特性研究 认领 引用 被引量：75
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作者 曹茂盛 高正娟 朱静 《材料工程》 EI CAS 北大核心 2003年第2期34-36,共3页
研究了添加不同质量分数CNTs的聚酯基复合材料的电磁波吸收性能,初步分析了CNTs的螺旋结构和手征性质导致8～40GHz波段良好的吸收。其中厚度为1.40mm±0.05mm的CNTs/Polyester复合材料在25GHz有较强的吸收峰。
关键词 碳纳米管 微波吸收率 雷达吸波材料 聚酯 CNTs/Polyester 复合材料 微波吸收特性
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Rational Design of High-Performance Bilayer Solar Evaporator by Using Waste Polyester-Derived Porous Carbon-Coated Wood 认领 引用 被引量：13
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作者 Ning Liu Liang Hao +3 位作者 Boyi Zhang Ran Niu Jiang Gong Tao Tang 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2022年第2期617-626,共10页
Wood-based bilayer solar evaporators,which possess cooperative advantages of natural wood and photothermal conversion coating including fast water transportation,low heat conduction,renewability,and high light absorba... Wood-based bilayer solar evaporators,which possess cooperative advantages of natural wood and photothermal conversion coating including fast water transportation,low heat conduction,renewability,and high light absorbability,hold great promise for water purification.However,previous studies suffer from low evaporation rates and high cost of coatings,and lack a deep understanding how the porous structures of coating layer function.Herein,a novel bilayer solar evaporator is designed through facile surface coating of wood by low-cost porous carbon from controlled carbonization of polyester waste.The porous carbon bears rich oxygen-containing groups,well-controlled micro-/meso-/macropores,and high surface areas(1164 m2 g−1).It is proved that porous carbon improves sunlight absorption and promotes the formation of numerous water clusters to reduce water evaporation enthalpy.Owing to these combined features,the bilayer solar evaporator exhibits high evaporation rate(2.38 kg m−2 h−1),excellent longterm stability,and good salt resistance.More importantly,a large-scale solar desalination device for outdoor experiments is developed to produce freshwater from seawater.The daily freshwater production amount(3.65 kg m−2)per unit area meets the daily water consumption requirement of one adult.These findings will inspire new paradigms toward developing efficient solar steaming technologies for desalination to address global freshwater shortage. 展开更多
关键词 solar steam generation waste polyester hierarchically porous carbon desalination freshwater production
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PROPERTIES AND MORPHOLOGY OF UNSATURATED POLYESTER/ACRYLATE-TERMINATED POLYURETHANE/ORGANO-MONTMORILLONITE NANOCOMPOSITES 认领 引用 被引量：8
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作者 Chang-jiang You Jin-guo Xu +3 位作者 Song Xi Xiao-xia Duan Jie Shen De-min Jia 《Chinese Journal of Polymer Science》 SCIE EI CAS 2005年第5期471-478,共8页
Unsaturated polyester resin(UPR)/acrylate-terminated polyurethane(ATPU)/organo-modified montmorillonite(OMMT)nanocomposites were prepared by the in situ intercalative polymerization method.Samples were prepared by the... Unsaturated polyester resin(UPR)/acrylate-terminated polyurethane(ATPU)/organo-modified montmorillonite(OMMT)nanocomposites were prepared by the in situ intercalative polymerization method.Samples were prepared by the sequential mixing,i.e.mixture of the ATPU and styrene(S)and OMMT were prepared in the first step;UPR was then added to the pre-intercalates of ATPU/S/OMMT.Results indicate that the mechanical properties and thermal properties of UPR/ATPU/OMMT nanocomposites greatly depend on the amount of ATPU and OMMT.Results show that the addition of ATPU could increase the impact strength of UPR/ATPU composites,but the tensile strength,flexural strength and heat resistance of the materials are obviously decreased.When the weight ratio between UPR,ATPU and OMMT were 82:15:3,the impact strength and heat distortion-temperature of nanocomposite were greatly improved,meanwhile there was little change for other properties of the nanocomposites.The synergistic enhancement effects of ATPU and OMMT on the composites were observed.The structures and morphology of the composites were investigated by X-ray diffraction,scanning electron microscopy and transmission electron microscopy. 展开更多
关键词 Unsaturated polyester Acrylic terminal polyurethane Organo-modified montmorillonite Nanocomposite.
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Structure‑guided engineering of a Thermobifida fusca cutinase for enhanced hydrolysis on natural polyester substrate 认领 引用 被引量：6
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作者 Qilei Dong Shuguang Yuan +5 位作者 Lian Wu Lingqia Su Qiaoling Zhao Jing Wu Weixue Huang Jiahai Zhou 《Bioresources and Bioprocessing》 SCIE EI 2020年第1期356-364,共9页
Cutinases could degrade insoluble polyester,including natural cutin and synthetic plastic.However,their turnover efficiency for polyester remains too low for industrial application.Herein,we report the 1.54-?resolutio... Cutinases could degrade insoluble polyester,including natural cutin and synthetic plastic.However,their turnover efficiency for polyester remains too low for industrial application.Herein,we report the 1.54-?resolution X-ray crystal structure of a cutinase from Thermobifida fusca and modeling structure in complex with a cutin mimic oligo-polyester C24H42O8.These efforts subsequently guided our design of cutinase variants with less bulky residues in the vicinity of the substrate binding site.The L90A and I213A variants exhibit increased hydrolysis activity(5-and 2.4-fold,respectively)toward cutin and also showed enhanced cotton scouring efficiency compared with the wild-type enzyme. 展开更多
关键词 Cutinase Polyester cutin Enzyme engineering Cotton scouring Loop flexibility
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Efficient synthesis of hydroxyl functioned polyesters from natural polyols and sebacic acid 认领 引用 被引量：5
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作者 Zhuo Yuan Ning Qing Shan Zhang +3 位作者 Qin Pei Wu Yun Zheng Li Dong Xia Ma Jia Zhe Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第6期635-638,共4页
Amphiphilic hydroxyl functioned polyester(HFP)can be used as compatibilizers for blends of starch and resins.We developed a synthetic method for effective preparation of HFPs.Water was removed by high flow rate N_2 ra... Amphiphilic hydroxyl functioned polyester(HFP)can be used as compatibilizers for blends of starch and resins.We developed a synthetic method for effective preparation of HFPs.Water was removed by high flow rate N_2 rather than high vacuum during polycondensation of sebacic acid with xylitol,sorbitol,or mannitol in the presence of dehydrative condensation catalyst and the product is with[η]of 27.2 mL/g,M_n of 1903,M_w of 167,693,T_g of-30.5℃,T_m of 44.0℃.Weight loss is 1.73%under 200℃.The integral distributions of molecular weight are 43.6 wt%and 63.8 wt%over 10,000 and 3000,respectively.The results indicated that higher molecular weight HFP was economically synthesized. 展开更多
关键词 Hydroxyl functioned polyester Poly(sorbitol sebacate) Dehydrative condensation catalyst Biodegradable plastics
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THE AMPHIPHILIC MULTIARM COPOLYMERS BASED ON HYPERBRANCHED POLYESTER AND LYSINE:SYNTHESIS AND SELF-ASSEMBLY 认领 引用 被引量：3
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作者 Jing Wang Yuan Yao +3 位作者 Bing Ji Wei Huang Yong-feng Zhou De-yue Yan 《Chinese Journal of Polymer Science》 SCIE EI CAS CSCD 2011年第2期241-250,共10页
The amphiphilic multiarm copolymers were synthesized through the modification of commercially available hyperbranched polyesters(Boltorn H40)with N-ε-carbobenzoxy-L-Lysine N-carboxyanhydride(ZLys-NCA).After being con... The amphiphilic multiarm copolymers were synthesized through the modification of commercially available hyperbranched polyesters(Boltorn H40)with N-ε-carbobenzoxy-L-Lysine N-carboxyanhydride(ZLys-NCA).After being condensed with N-Boc-phenylalanine(Boc-^NPhe)and deprotected the Boc-groups in trifluoroacetic acid(TFA),the original terminal hydroxyl groups were transformed into the amino groups and then initiated the ring-opening polymerization of ZLys-NCA.The hydrophilic poly(L-lysine)was grafted to the surface of Boltorn H40 successfully after the protecting benzyl groups were removed by the HBr solution in glacial acetic acid(33 wt%).The resulting multiarm copolymers were characterized by the^1H-NMR,GPC and FTIR.The arm length calculated by NMR and GPC analysis was about 3 and 13 lysine-units for H40-Phe-PLysl and H40-Phe-PLys2 respectively.Due to the amphiphilic molecular structure,they displayed ability to self-assemble into spherical micelles in aqueous solution with the average diameter in the range from 70 nm to 250 nm.The CMC of H40-Phe-PLysl and H40-Phe-PLys2 was 0.013 mg/mL and 0.028 mg/mL,respectively,indicating that H40-Phe-PLysl with shorter arm length is easier to self-assemble than H40-Phe-PLys2 with longer arm length. 展开更多
关键词 N-ε-carbobenzoxy-L-Lysine N-carboxyanhydride Amphiphilic multiarm copolymer Hyperbranched polyester Modification Self-assembly
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