Yuechuan Wang

Sichuan University

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Liangcheng Cao

Chongqing Institute of Green and Intelligent Technology

Liping Gao

Jiangxi Normal University

Xuhua He

Nanjing University

Guo-jing Ding

Shanghai University

Mengxian Ding

Chinese Academy of Sciences

Mengdi Chen

Ruijin Hospital

Han Yang

Hubei University of Arts and Science

Zhang Zhengyuan

Sichuan University

Bo Liang

Hubei University of Automotive Technology

Wei Tan

Sichuan University

Cooperative Institutions

Sichuan University

Chengdu University

Chinese Academy of Sciences

University of Chinese Academy of Sciences

China National Offshore Oil Corporation (China)

Ingenierie des Materiaux polymeres

Fudan University

Huazhong University of Science and Technology

Shanghai Jiao Tong University

Polymer Research Institute

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Curing of Multi-Branched Polythiol and Epoxy Resin System

Gōsei jushi (2009)

Yuechuan Wang

The development of new hardener materials was vital important for improving the properties and application of epoxy resin.A multi-branched polythiol hardener was prepared by the step-polymerization of 2,2’-mercaptoethyl sulfide(MES) and trimethylol propane triacrylate (TMPTA),and the curing reaction of epoxy resin with the multi-branched polythiol at room-temperature was studied. The -SH contents,degree of branching and molecular weight of the macromolecular multi-branched polythiol hardener were characterized with 1H-NMR and gel permeation chromatopraphy(GPC).The curing processes and the thermal stability of the cured epoxy resin with this hardener were studied by real-time infrared (RT-IR) and thermopravimetic analysis(TGA),respectively.It was found that comparing with the widely used alphatic multiamines,this multi-branched polythiol hardeners was much active in the initial stage of curing.After about 80 min,the conversion of -SH and epoxy groups were reached about 48 % and 36 %.Thermal stability of the cured resin was increased with the starting degradation temperature was at about 322 ℃.

TMPTA

Propane

Thermal Stability

Branching (polymer chemistry)

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Living Free Radical Photopolymerization of Styrene Initiated with Trithiocarbonate

Gaofenzi cailiao kexue yu gongcheng (2006)

Yuechuan Wang

A reversible addition-fragmentation chain transfer(RAFT) agent,S,S′-bis(α,α′-dimethyl-α″-acetic acid)trithiocarbonate(TRIT)for free radical polymerization was synthesized.The photopolymerizations of styrene(St),in the presence of TRIT were carried out and resulted in PSt with narrow molecular weight distributions.It was found that in the photopolymerization of styrene with TRIT,ln[M]_0/[M] was linearly increased with polymerization time,polymer molecular weights were linearly changed with monomer conversion,and the molecular weight distribution of PSt became slightly narrower as monomer conversion increase.Both FT-IR and()~1HNMR spectra data indicated the presence of trithiocarbionate structure in PSt.The calculated molecular weight of PSt agrees quite well with the experiment values determined by GPC and NMR.The photopolymerizations of styrene(St) in the presence of TRIT exhibited the characteristics of living polymerization.The triblock copolymer,PSt-PBA-PSt,with narrow polydispersity and well-defined structure was successfully prepared using PSt-S-C(=S)-S-PSt as macro-photoinitiator under UV irradiation at room temperature.

Dispersity

Chain transfer

Living free-radical polymerization

Molar mass distribution

Living polymerization

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Significantly enhanced thermal conductivity in polyimide composites with the matching of graphene flakes and aluminum nitride by in situ polymerization

Polymer Composites (2019)

Xuhua He Xin Yu Yuechuan Wang

Abstract Highly thermally conductive polymer composites are urgently required for effective heat dissipation in advanced electronic devices. Rational matching of thermal conductive fillers and proper preparation method are important for obtaining a highly thermally conductive composites at low filler content. Here we report polyimide (PI) composites filled with graphene flakes (GF) and polyhedral aluminum nitride (AlN), which simultaneously exhibit high thermal conductivity, improved thermal mechanical properties, and excellent thermal stability. PI composite films were readily prepared by in situ polymerization at the presence of fillers that are dispersed with sonication. The thermal conductivity of PI composite films reached 11.19 Wm −1 K −1 at the low content of 1 wt% GF and 10 wt% AlN, which is ascribed to the construction of synergistically enhanced heat transfer pathways by the combination of the hybrid fillers. The PI composite films with hybrid fillers also showed lower electrical conductivity than that of the PI composite films with single GF filler. This study provides an effective method for preparation of high‐performance thermal management materials.

Thermal Stability

In situ polymerization

Filler (materials)

10.1002/pc.25404

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Facile synthesis of two-dimensional carbon/Si composite assembled by ultrasonic atomization-assisted-ice template technology as electrode for lithium-ion battery

Journal of Alloys and Compounds (2023)

Bo Liang Wei Tan Menghao Chen Maoyu Yi Jianghuai Hu

Nanomaterials

Carbon fibers

10.1016/j.jallcom.2023.173030

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Synthesis of metallo-supramolecular polymers and their multicolor electrochromic devices

Scientia Sinica Chimica (2018)

Han Yang Yuecong Zhang Yuchen Qian Yuechuan Wang

和四川桑瑞光辉标识系统股份有限公司资助项目摘要本文合成了一种多齿配体化合物--1,4-双(2,2′:6′,2′′-三联吡啶-4′-基)苯及其Fe/Ru金属-超分子聚合物 --PolyFe和PolyRu, 同时以喷涂在ITO导电玻璃上的Fe/Ru金属-超分子聚合物膜为工作电极、0.1 mol/L LiClO 4 水溶液为电解质, 并添加K 3 Fe(CN) 6 为电化学互补材料, 制作了系列电致变色器件.由PolyFe和PolyRu的组合, 可以得到从PolyFe的蓝紫色渐变到PolyRu橙红色的彩色薄膜及其多色电致变色器件, 器件响应速度快(<2 s), 褪色电压 0.9~1.2V, 着色电压0 V, 最大光学对比度约57%

Supramolecular Polymers

Electrochromic devices

10.1360/n032018-00007

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Recent Advances in Thermally Light-adjusting Polymeric Materials

Cailiao daobao (2007)

Yuechuan Wang

Optical materials

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