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Study on Preparation and Properties of Polyether polytriazole Elastomers

Chinese Journal of Polymer Science 2015年第4期33卷 597-606页

作者：翟进贤 Zheng-yang Qu Ye-cheng Zou Xiao-yan Guo Rong-jie Yang School of Materials Beijing Institute of Technology

To explore the application of click chemistry in the field of elastomer materials, propargyl-terminated ethylene oxide-tetrahydrofuran copolymer （PTP（E-co-T）） was prepared from hydroxyl-terminated ethylene oxide-tetrahydrofuran copolymer （P（E-co-T）） by end-etherisation modification. FTIR and ^13C-NMR results indicate that P（E-co-T）-terminated hydroxyl was etherified thoroughly, yielding the target product PTP（E-co-T）, and the content of terminated alkynyl of PTP（E-co-T） was evaluated to be 0.428 mmol.g^-l. Using a polyazide compound as a cross-linker, polytriazole elastomers with various functional molar ratio （R） values were prepared from PTP（E-co-T） by virtue of the CuAAC reaction. Mechanical property tests indicate that with the increase in R, the modulus E and stress Orb of the polytriazole elastomers first increase and subsequently decrease, whereas the strain first decreases and later increases. The mechanical properties of the polytriazole elastomers show a parabolic dependence on the R value. Near the stoichiometric ratio, E and Orb show maxima and the strain εb shows a minimum. Swelling tests demonstrate that the apparent molecular weight of polytriazole elastomer strands also first decreases and subsequently increases. At the stoichiometric ratio, the network structure possesses strands with a minimum apparent molecular weight and a maximum apparent density. Dynamic mechanical analysis reveals that the polytriazole elastomers presented damping peaks at approximately -64℃, corresponding to the glass transition of copolyether strands, and the elastomer exhibited the lowest dissipation factor tanδ at the stoichiometric ratio. Thermal analysis suggests that the weight-loss process of the polytriazole elastomer is characteristic of one-step decomposition, and the elastomer begins to decompose from polyether strands, not triazole groups.

关键词： Click chemistry polytriazole Elastomers PTP(E-co-T).

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PREPARATION AND PROPERTIES OF A NOVEL polytriazole RESIN AND ITS CARBON FIBER REINFORCED COMPOSITE

PREPARATION AND PROPERTIES OF A NOVEL POLYTRIAZOLE RESIN AND...

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作者： Wan Liqiang, Tian Jianjun, Xue Lian, Huang Jianzhi, Hu Yanhong, Huang Farong, Du Lei School of Material Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237 , China

＜正＞A novle polytriazole resin and its carbon fiber reinforced composite were studied. Rheolog-ical behavior of polytriazole resin shows that the resin could be cured at 70℃. Mechanical properties and glass transition temperature （Tg） of the cured resin and its carbon fiber reinforced composites were measured. The results show that tensile strength, the flexural strength, Tg of the cured resin arrive at 99. 0 MPa, 200 MPa, and 218℃, respectively. The flexural strength at room temperature and its remaining percentage at 160℃ of the composite are higher than 1 600 MPa and 76. 3%.

关键词： polytriazole Low temperature molding Carbon fiber reinforced composite Advanced composite material High performance

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AZIDE-ALKYNE CLICK POLYMERIZATION:AN UPDATE

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Chinese Journal of Polymer Science 2012年第1期30卷 1-15页

作者： Hong-kun Li Jing-zhi Sun An-jun Qin Ben Zhong Tang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Department of Chemistry Institute of Molecular Functional Materials The Hong Kong University of Science ＆ Technology Clear Water Bay Kowloon Hong Kong China

The great achievements of click chemistry have encouraged polymer scientists to use this reaction in their field. This review assembles an update of the advances of using azide-alkyne click polymerization to prepare functional polytriazoles（PTAs） with linear and hyperbranched *** Cu（I）-mediated click polymerization furnishes 1,4-regioregular PTAs,whereas,the metal-free click polymerization of propiolates and azides produces PTAs with 1,4-regioisomer contents up to 90%.The PTAs display advanced functions,such as aggregation-induced emission,thermal stability,biocompatibility and optical nonlinearity.

关键词： Click polymerization Azide Alkyne polytriazole Functionality

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An air-stable supported Cu(?) catalyst for azide-alkyne click polymerization

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Science China Chemistry 2015年第11期58卷 1748-1752页

作者： Haiqiang Wu Wenhui Dong Zongtan Wang Bicheng Yao Ming Chen Jingzhi Sun Anjun Qin Ben Zhong Tang Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Department of Polymer Science and Engineering Zhejiang University Guangdong Innovative Research Team State Key Laboratory of Luminescent Materials and Devices South China University of Technology Department of Chemistry Institute for Advanced Study Institute of Molecular Functional Materials and State Key Laboratory of Molecular Neuroscience the Hong Kong University of Science and Technology

An air-stable supported Cu(I) catalyst, Cu I@PS-Phen, was designed and synthesized. Cu I@PS-Phen can efficiently catalyze the click polymerization of diynes a and diazides b to produce soluble and thermally stable polytriazoles with high molecular weights(Mw up to 30800), and low copper residue content(down to 190 ppm) in high yields(up to 94.2%) under mild reaction conditions without the exclusion of oxygen.

关键词： azide-alkyne click polymerization copper residue polytriazole supported Cu(I) catalyst

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