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Synthesis of Hyperbranched Polymers and Its Effect on Water Vapor Permeability of Microfiber Synthetic Leather 被引量:7
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作者 强涛涛 王学川 任龙芳 《Journal of Donghua University(English Edition)》 EI CAS 2010年第4期463-468,共6页
A series of hyperbranched poly(amine-ester)polyols were synthesized by the polycondensation of N,N-diethylol-3-amine-methylpropionate(prepared by Michael addition reaction of methyl acrylate with diethanolamine)as an ... A series of hyperbranched poly(amine-ester)polyols were synthesized by the polycondensation of N,N-diethylol-3-amine-methylpropionate(prepared by Michael addition reaction of methyl acrylate with diethanolamine)as an AB2-type monomer with trimethylol propane as the core moiety,proceeding in one-step procedure in the melt with p-toluenesulfonic acid as catalyst.The obtained monomer and polymers were characterized by FTIR and 1H-NMR spectroscopy.The solubility and surface activity in aqueous solution of the polymers were also examined.The gas permeability,water vapor permeability,and moisture absorption of microfiber synthetic leather treated by hyperbranched polymer were studied.The optimum conditions were that the dosage of dye and hyperbranched polymer was 5% and 10%,respectively.The water vapor permeability and moisture absorption of microfiber synthetic leather reached to 0.525 4 mg/(10 cm2·24 h)and 0.046 7 mg/(10 cm2·24 h).Compared with blank samples,they increased by 15% and 35%,respectively.However,the dosage of hyperbranched polymer has little influence on gas permeability of microfiber synthetic leather.SEM results show that the fiber of microfiber synthetic leather treated by hyperbranched polymer is incompact. 展开更多
关键词 hyperbranched polymer SYNTHESIS water vapor permeability MICROFIBER synthetic leather
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Influence of Reactive Diluent on UV-curing of AcrylateTerminated Hyperbranched Polymers 被引量:2
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作者 TANGLi-ming FANGYu YANLiang FUZhi-wei 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2004年第2期248-252,共5页
A Aeries of hydroxylic hyperbranched polymers were derived from 2,2-bis(methylol) propionic acid and tris(methylol) propane reacted with acrylic acid to various extents. The obtained acrylated hyperbranched polymers a... A Aeries of hydroxylic hyperbranched polymers were derived from 2,2-bis(methylol) propionic acid and tris(methylol) propane reacted with acrylic acid to various extents. The obtained acrylated hyperbranched polymers alone or with a monofunctional diluent, isobornylene acrylate(IBOA) were further cured by UV radiation. The cured films based on the modified polymers alone all demonstrated poor mechanical properties due to their high network densities and low moving ability of polymer chains. For the composite systems, the cured films demonstrated improved mechanical properties due to the low network densities and high chain moving ability. With more IBOA included in the systems, acrylate groups can react to a higher extent during the curing process. 展开更多
关键词 Reactive diluent UV curing Acrylated hyperbranched polymer
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STUDY ON UV CURABLE POWDER COATINGS BASED ON HYPERBRANCHED POLYMERS 被引量:1
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作者 施文芳 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2001年第2期155-160,共6页
By introducing semicrystalline moieties into hyperbranched molecular smictures three kinds of prepolymers of potential use as UV powder coatings were prepared and characterized.
关键词 hyperbranched polymer CRYSTALLINITY UV powder coating
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Hyperbranched polymer hollow-fiber-composite membranes for pervaporation separation of aromatic/aliphatic hydrocarbon mixtures
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作者 Tong Liu Hao Sun +5 位作者 Xiangqiong Wang Jie Li Zhanquan Zhang Pei Wu Naixin Wang Quanfu An 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第5期13-22,共10页
The separation of aromatic/aliphatic hydrocarbon mixtures is crucial in the petrochemical industry.Pervaporation is regarded as a promising approach for the separation of aromatic compounds from alkanes. Developing me... The separation of aromatic/aliphatic hydrocarbon mixtures is crucial in the petrochemical industry.Pervaporation is regarded as a promising approach for the separation of aromatic compounds from alkanes. Developing membrane materials with efficient separation performance is still the main task since the membrane should provide chemical stability, high permeation flux, and selectivity. In this study, the hyperbranched polymer(HBP) was deposited on the outer surface of a polyvinylidene fluoride(PVDF)hollow-fiber ultrafiltration membrane by a facile dip-coating method. The dip-coating rate, HBP concentration, and thermal cross-linking temperature were regulated to optimize the membrane structure.The obtained HBP/PVDF hollow-fiber-composite membrane had a good separation performance for aromatic/aliphatic hydrocarbon mixtures. For the 50%/50%(mass) toluene/n-heptane mixture, the permeation flux of optimized composite membranes could reach 1766 g·m^(-2)·h^(-1), with a separation factor of 4.1 at 60℃. Therefore, the HBP/PVDF hollow-fiber-composite membrane has great application prospects in the pervaporation separation of aromatic/aliphatic hydrocarbon mixtures. 展开更多
关键词 Aromatic/aliphatic hydrocarbons hyperbranched polymer PERVAPORATION Hollow fiber membrane DIP-COATING
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A New Method for Synthesizing Hyperbranched Polymers with Reductive Groups Using Redox/RAFT/SCVP 被引量:4
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作者 白利斌 Kun Zhao +5 位作者 Yong-gang Wu Wen-liang Li Su-juan Wang Hai-jun Wang 巴信武 Hong-chi Zhao 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2014年第4期385-394,共10页
The novel hyperbranced polymers containing reductive groups were successfully prepared and characterized using redox/reversible addition fragmentation chain transfer (RAFT)/self-condensing vinyl polymerization (SCV... The novel hyperbranced polymers containing reductive groups were successfully prepared and characterized using redox/reversible addition fragmentation chain transfer (RAFT)/self-condensing vinyl polymerization (SCVP) method. Several redox initiating chemicals such as Cu(III)/--CONH2, Ce(IV)/--CONH2 and Ce(IV)/--OH were chosen to increase the free radical generating rate, and the chain transfer agent (CTA) was used to reduce the molecular chain propagating rate, in order to obtain polymers with high degree of branching. Detailed analyses based on the molecular weight, α value and the degree of branching of polymers (DB) obtained from 1H-NMR spectra and multi detector size exclusion chromatography (MDSEC) suggested the acquiring of hyperbranced polyacrylamides with Cu(III)/--CONH2 and Ce(IV)/--CONH2 as initiator in the presence of the CTA. Meanwhile, the as-prepared poly(N-hydroxymethyl acrylamide) (PNHAM) with higher DB value (0.48) proved that using Ce(IV)/--OH as the initiator could increase the free radical generating rate and diminish the gap between the propagating rate and the initiation rate during the reaction procedure. In addition, the effect of oxidant concentration on the Mark-Houwink index (α) value and the DB was also studied. 展开更多
关键词 hyperbranched polymers Redox RAFT SCVP Free radical polymerization.
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Novel Hyperbranched Polymers as Host Materials for Green Thermally Activated Delayed Fluorescence OLEDs 被引量:2
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作者 Ling-yun Zhao Ya-nan Liu +4 位作者 Shi-fan Wang 陶友田 Fang-fang Wang 张新稳 黄维 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2017年第4期490-502,共13页
A series of novel hyperbranched polymers (HBPs) consisting ofa 2,7-subsituted 9-(heptadecan-9-yl)-9H-carbazole unit (A2+A2') and a tetra-substituted green thermally activated delayed fluorescence (TADF) dye ... A series of novel hyperbranched polymers (HBPs) consisting ofa 2,7-subsituted 9-(heptadecan-9-yl)-9H-carbazole unit (A2+A2') and a tetra-substituted green thermally activated delayed fluorescence (TADF) dye of 2,3,5,6-tetra(9H- carbazol-9-yl)-4-pyridinecarbonitrile (4CzCNPy, B4) have been synthesized via Suzuki cross-coupling reaction following an "Az+A2'+B4" method. The polymers are named according to the polymerization ratio of 4CzCNPy monomer (5 mol%, 10 mol% and 15 mol% for HBPs of P2-P4 respectively, and 0 mol% for the control linear polymer P1). Their thermal, optoelectronic and electrochemical properties have been characterized by a combination of techniques. All the polymers exhibit high thermal stability with the decomposition temperatures (Ta) above 400 ℃ and glass transition temperatures (Tg) up to 98℃. Unfortunately, the incorporation of TADF moiety into these HBP materials induced non-TADF characteristics. However, when the HBPs functionalized as the host for our previously developed 4CzCNPy TADF dopant in solution processed devices, maximum external quantum efficiency of 5.7% and current efficiency of 17.9 cd/A have been achieved in P3-based device, which is significantly higher than those of 1.5% and 4.2 cd/A for the linear polymer P1. 展开更多
关键词 hyperbranched polymers HOST DOPANT Polymer lighting-emitting diodes Thermally activated delayedfluorescence
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Amphiphilic hyperbranched polymers:synthesis,characterization and selfassembly performance 被引量:1
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作者 Longfang Ren Qiaoxuan Niu +1 位作者 Jing Zhao Taotao Qiang 《Journal of Leather Science and Engineering》 2020年第1期38-49,共12页
A series of amphiphilic hyperbranched polymers(AHP-s,the“s”refers to the algebra of AHP)were synthesized by the reaction between hydroxyl-terminated hyperbranched polymers(HBP-s,the“s”refers to the algebra of HBP)... A series of amphiphilic hyperbranched polymers(AHP-s,the“s”refers to the algebra of AHP)were synthesized by the reaction between hydroxyl-terminated hyperbranched polymers(HBP-s,the“s”refers to the algebra of HBP)and palmitoyl chloride.FTIR,NMR and GPC were used to determine the structure of AHP-s,the results showed that AHP-s exhibits core-shell structure.The thermal properties of polymers were investigated by DSC and TGA.It was found that AHP-2,AHP-3 and AHP-4 display higher thermal stability than AHP-1(AHP-1,AHP-2,AHP-3 and AHP-4 represent the first,second,third and fourth generation AHP,respectively).Furthermore,the self-assembly performance of AHP-s in THF solvent was investigated by TEM and SEM.Finally,the encapsulation capacity of the AHP-s for methyl orange(MO)was explored at different concentrations of AHP-s and pH conditions.It was found that AHP-s is capable of accommodating hydrophilic guest MO.Moreover,the higher generation of AHP-s,the stronger encapsulation capacity obtained.And the encapsulation capacity closely associated with the pH of encapsulation system. 展开更多
关键词 Amphiphilic hyperbranched polymers SYNTHESIS SELF-ASSEMBLY Guest encapsulation performance
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DEGREE OF BRANCHING OF THE HYPERBRANCHED POLYMERS RESULTED FROM AB_2 POLYCONDENSATION WITH SUBSTITUTION EFFECT
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作者 周志平 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2011年第5期569-574,共6页
The analytical expressions of the various structural units and the average degree of branching for the hyperbranched polymers resulted from AB2 polycondensation with substitution effect were derived by the kinetic mec... The analytical expressions of the various structural units and the average degree of branching for the hyperbranched polymers resulted from AB2 polycondensation with substitution effect were derived by the kinetic mechanism. The reactivity difference between the 13 group in linear unit and that in terminal group has great effect on the molecular parameters of the products obtained. The concentration of terminal units has a maximum with the increase of the conversion of A groups (x). The higher the reactivity ratio (r) of linear B group to branched one is, the later the maximum appears and the larger it is. The degree of branching of the hyperbranched polymers obtained is controllable by adjusting the parameters of r and x, which increases with increasing both x and r. 展开更多
关键词 Degree of branching POLYCONDENSATION hyperbranched polymers Substitution effect.
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POSS-embedded supramolecular hyperbranched polymers constructed from a 1→7 branching monomer with controllable morphology transitions 被引量:3
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作者 Xing Wang Yanyu Yang +2 位作者 Linfeng Fan Fei Yang Decheng Wu 《Science China Chemistry》 SCIE EI CAS CSCD 2018年第3期311-318,共8页
The research on the supramolecular hyperbranched polymers(SHPs) that combines the advantages of supramolecular polymer and hyperbranched architecture has attracted considerable interests in many applications. Here we ... The research on the supramolecular hyperbranched polymers(SHPs) that combines the advantages of supramolecular polymer and hyperbranched architecture has attracted considerable interests in many applications. Here we demonstrate a simple approach to prepare POSS-embedded supramolecular hyperbranched polymers(POSS-SHPs) with varied morphology and size by controlling monomer concentration and mixed solvents. The SHPs formations can further transfer into the core-shell structured micelles by addition of competitive guests based on the double supramolecular driving forces. 展开更多
关键词 POSS-embedded polymer supramolecular hyperbranched polymer host-guest interaction morphology transition
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Synthesis and characterization of dendronized hyperbranched polymers through the “A_3+B_2” approach 被引量:2
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作者 Guangchao Liu Pengyu Chen +1 位作者 Runli Tang Zhen Li 《Science China Chemistry》 SCIE EI CAS CSCD 2016年第12期1561-1567,共7页
Dendronized hyperbranched polymer (DHP) is a new kind of polymer, which combines the advantages of dendrimers and hy- perbranched polymers. In this work, two dendronized hyperbranched polymers, DttPG0 and DHPG1, wer... Dendronized hyperbranched polymer (DHP) is a new kind of polymer, which combines the advantages of dendrimers and hy- perbranched polymers. In this work, two dendronized hyperbranched polymers, DttPG0 and DHPG1, were successfully pre- pared through the simple "A3+B2" type Sonogashira coupling reaction. The nonlinear optical (NLO) effects of DHPG0 and DItPG1, characterized by the d33 values, were 183 and 220 pm V-1 respectively, higher than those of their analogues of den- dronized polymers and dendrimers, thanks to the special topological structure. Also, the obtained polymers displayed excellent solubility, good processability, and high thermal stability. 展开更多
关键词 dendronized hyperbranched polymer nonlinear optic Sonogashira coupling reaction
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HYPERBRANCHED AROMATIC POLYMERS OBTAINED VIA SELF-CONDENSATION
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作者 Xi Zhang Yong-ming Chen +5 位作者 Dong-yan Wang Jing Jiang Hong-wei Liu Chuan-fu Chen Fu Xi Center for Molecular Science, Institute of Chemistry Chinese Academy of Sciences, Beijing 100080, China The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation, Nankai University Tianjin 300071, China 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2001年第5期517-520,共4页
Hyperbranched aromatic polymers were prepared by Friedel-Crafts reaction with Lewis acid, AlCl3 and ZnCl2, as the catalysts. In this work, hyperbranched polybenzyl (PB) and poly(methylene)naphthalene (PN) were synthes... Hyperbranched aromatic polymers were prepared by Friedel-Crafts reaction with Lewis acid, AlCl3 and ZnCl2, as the catalysts. In this work, hyperbranched polybenzyl (PB) and poly(methylene)naphthalene (PN) were synthesized and characterized by H-1-NMR and GPC. In addition, their florescence properties were measured with steady-state florescence spectra in THF and ethylene dichloride. The quantum yields of polybenzyl and poly(methylene)naphthalene in ethylene dichloride are much larger than those in THE. 展开更多
关键词 hyperbranched polymer polybenzyl poly(methylene)naphthalene fluorescent spectra
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Synthesis and Properties of Photo-functional Hyperbranched Polymers
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作者 T.Nishikubo 《复旦学报(自然科学版)》 CAS CSCD 北大核心 2007年第5期641-,共1页
1 Results UV curing systems have been widely used in various industries such as coatings,printing inks,and photo-resists,because of their low volatile organic compound (VOC),excellent physical properties,and energy sa... 1 Results UV curing systems have been widely used in various industries such as coatings,printing inks,and photo-resists,because of their low volatile organic compound (VOC),excellent physical properties,and energy saving.Recently,these systems have also been applied to electronics and information technology fields such as display,CD,DVD,optical-fiber,and optical-device. In these curing systems,(meth)acrylate oligomers are mainly used due to their high photochemical reactivity. Recently,dendritic polyme... 展开更多
关键词 synthesis photo-chemical reaction hyperbranched polymer epoxy-(meth)acrylate
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HYPERBRANCHED CONJUGATIVE MACROMOLECULES CONSTRUCTED FROM TRIPLE-BOND BUILDING BLOCKS 被引量:7
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作者 Matthias HaeuBler Hong-chen Dong +3 位作者 Jacky Wing Yip Lam Rong-hua Zheng An-jun Qin Ben-zhong Tang 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2005年第6期567-591,共25页
Polycyclotrimerization and polycoupling of acetylenic monomers respectively furnish hyperbranched polyarylenes and polyynes with high molecular weights (up to 1 × 10^6) in high yields (up to 99.9%). The polym... Polycyclotrimerization and polycoupling of acetylenic monomers respectively furnish hyperbranched polyarylenes and polyynes with high molecular weights (up to 1 × 10^6) in high yields (up to 99.9%). The polymers possess low intrinsic viscosities and high thermal stabilities, losing little of their weights when heated to 〉 400℃. Upon pyrolysis at 〉 800℃, the polymers graphitize with high char yields (up to 86%). Hyperbranched polyarylenes efficiently emit deep-blue to blue-green lights with fluorescence quantum yields up to 98% and strongly attenuate intense laser pulses with optical power-limiting performances superior to that of C60, a well-known optical limiter. Poly(alkenephenylenes), poly(aroylarylenes) and polyynes are readily cross-linkable by UV irradiation, serving as excellent photoresist materials for the generation of patterns with nanometer resolution. Thin films of hyperbranched polyynes exhibit very high refractive indexes (n up to 1.86). The internal and terminal acetylene moieties of the polyynes readily form complexes with cobalt carbonyls, which can be transformed into soft ferromagnetic ceramics with high magnetic susceptibilities (Ms up to ca. 118 emu/g) and near-zero magnetic losses. 展开更多
关键词 hyperbranched polymers Alkyne polycyclotrimerization Alkyne polycoupling POLYARYLENES POLYYNES Optical materials PHOTORESISTS Soft ferromagnetic ceramics
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SYNTHESIS OF HYPERBRANCHED CONJUGATIVE POLY(ARYLENEETHYNYLENE)S BY ALKYNE POLYCYCLOTRIMERIZATION 被引量:3
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作者 HanPeng Rong-huaZheng +2 位作者 Hong-chenDong De-minJia Ben-zhongTangb 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2005年第1期1-3,共3页
A series of new hyperbranched poly(aryleneethynylene)s are synthesized by the copolycyclotrimerizations oftetraynes(Ⅰand Ⅱ)with aliphatic monoynes(A-C)catalyzed by tantalum-,niobium-,and cobalt-based catalysts.All t... A series of new hyperbranched poly(aryleneethynylene)s are synthesized by the copolycyclotrimerizations oftetraynes(Ⅰand Ⅱ)with aliphatic monoynes(A-C)catalyzed by tantalum-,niobium-,and cobalt-based catalysts.All thereactions proceed smoothly and soluble polymers of high molecular weights(M_w up to 3.8×10~4)are obtained in high yields(up to 97%). 展开更多
关键词 Polycyclotrimerization hyperbranched polymers Poly(aryleneethynylene)s.
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SYNTHESES AND CHARACTERIZATIONS OF HYPERBRANCHED POLYPHENYLENES 被引量:1
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作者 唐本忠 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2004年第6期501-503,共3页
New hyperbranched polyphenylenes with high molecular weights are synthesized by the copolycyclotrimerizations of 1,4-diethynylbenzene (I) with phenylacetylene (A), 1-octyne (B), and 1-dodecyne (C) catalyzed by TaCl5-P... New hyperbranched polyphenylenes with high molecular weights are synthesized by the copolycyclotrimerizations of 1,4-diethynylbenzene (I) with phenylacetylene (A), 1-octyne (B), and 1-dodecyne (C) catalyzed by TaCl5-Ph4Sn. The polymers are completely soluble in common solvents such as toluene, THF, chloroform, and dichloromethane. The polymers are characterized by spectroscopic methods and all of the polymers give satisfactory analysis data corresponding to their expected molecular structures. 展开更多
关键词 alkyne polycyclotrimerization hyperbranched polymers POLYPHENYLENES
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Novel hyperbranched polyimides from 2,6,12-triaminotriptycene 被引量:5
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作者 Zhen Xu Xing Quan Xiong Lin Cheng 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第9期1127-1130,共4页
The monomer 2,6,12-triaminotriptycene was synthesized and the structure was confirmed by IR and 1H NMR spectra. Hyperbranched polyimides modified with different terminal groups were obtained from precursors, anhydride... The monomer 2,6,12-triaminotriptycene was synthesized and the structure was confirmed by IR and 1H NMR spectra. Hyperbranched polyimides modified with different terminal groups were obtained from precursors, anhydride- and aminoterminated hyperbranched poly(amic acid)s from polymerization of A2 + B3 system. From gel permeation chromatograrn (GPC) characterization, representative products had high molecular weight. All polymers had good solubility in CHCl3, DMF and tetrahydrofuran (THF), and performed no detective Tgs in the range of 50-300 ℃ and high Tds above 455 ℃ when 5% weight loss. 展开更多
关键词 TRIPTYCENE hyperbranched polymer Polyimides
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Novel hot-melting hyperbranched poly(ester-amine) bearing self-complementary quadruple hydrogen bonding units 被引量:5
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作者 Yi Peng Qiu Li Ming Tang +1 位作者 Yu Wang Shi You Guan 《Chinese Chemical Letters》 SCIE CAS CSCD 2008年第7期868-870,共3页
Hyperbranched poly(amine-ester)s bearing self-complementary quadruple hydrogen bonding units display excellent mechanical and temperature-dependent melt rheological properties, which make them suitable as novel hot-... Hyperbranched poly(amine-ester)s bearing self-complementary quadruple hydrogen bonding units display excellent mechanical and temperature-dependent melt rheological properties, which make them suitable as novel hot-melting materials. 展开更多
关键词 hyperbranched polymer Thermal sensitive Hydrogen bond
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Surface interaction between Pd and nitrogen derived from hyperbranched polyamide towards highly effective formic acid dehydrogenation 被引量:4
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作者 Yancun Yu Xian Wang +3 位作者 Changpeng Liu Fateev Vladimir Junjie Ge Wei Xing 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第1期212-216,I0008,共6页
Hydrogen production from formic acid decomposition(FAD)is a promising means of hydrogen energy storage and utilization in fuel cells.Development of efficient catalysts for dehydrogenation of formic acid is a challengi... Hydrogen production from formic acid decomposition(FAD)is a promising means of hydrogen energy storage and utilization in fuel cells.Development of efficient catalysts for dehydrogenation of formic acid is a challenging topic.The surface chemical and electronic structure of the active catalysis components is important in formic acid decomposition at room-temperature.Here,the pyrdinic-nitrogen doped catalysts from hyperbranched polyamide were prepared via in situ polymerization reaction process by using activated carbon as a support.Because of the introduction of the polymer,the particles of the catalysts were stabilized,and the average particle diameter was only 1.64 nm.Under mild conditions,the catalysts activities were evaluated for FAD.The optimized Pd-N30/C catalyst exhibited high performance achieving almost full conversion,with a turnover frequency of 3481 h^-1 at 30℃. 展开更多
关键词 Formic acid decomposition Hydrogen generation hyperbranched polymer Pd catalyst
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SYNTHESIS OF AN EPOXY-TERMINATED HYPERBRANCHED AROMATIC POLYESTER 被引量:4
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作者 W.J.Feast 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 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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A functional hyperbranched binder enabling ultra-stable sulfur cathode for high-performance lithium-sulfur battery 被引量:2
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作者 Xiang Luo Xianbo Lu +5 位作者 Xiaodong Chen Ya Chen Chunyang Yu Dawei Su Guoxiu Wang Lifeng Cui 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2020年第11期63-72,共10页
Binders are of vital importance in stabilizing the cathodes to enhance the cycling stability of lithiumsulfur(Li-S) batteries. However, conventional binders are typically confronted with the drawback of inability for ... Binders are of vital importance in stabilizing the cathodes to enhance the cycling stability of lithiumsulfur(Li-S) batteries. However, conventional binders are typically confronted with the drawback of inability for adsorbing lithium polysulfide(Li PS), thus resulting in severe active material losing and rapid capacity fading. Herein, a novel water-soluble hyperbranched poly(amidoamine)(HPAA) binder with controllable hyperbranched molecular structure and abundant amino end groups for Li-S battery is designed and fabricated, which can improve efficient adsorption for Li PS and stability of the sulfur cathodes. Besides, the strong intermolecular hydrogen bonds in HPAA binder can contribute to the structural stability of S cathode and integration of the conductive paths. Therefore, the Li-S battery with this functional binder exhibits excellent cycle performance with a capacity retention of 91% after 200 cycles at 0.1 C.Even at a high sulfur loading of 5.3 mg cm-2, a specific capacity of 601 mA h g-1 can also be achieved.Density functional theory(DFT) calculation further demonstrates that the enhanced electrochemical stability derives from the high binding energy between amino groups and LiP S and the wide electrochemical window(6.87 e V) of HPAA molecule. Based on the above all, this functional polymer will lighten a new species of binders for eco-friendly sulfur cathodes and significantly promote the practical applications of high-performance Li-S batteries. 展开更多
关键词 Functional binder hyperbranched polymer Sulfur cathode Polysulfide adsorption Lithium-sulfur battery
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