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题名: Synthesis of Gradient Copolysiloxanes by Simultaneous Copolymerization of Cyclotrisiloxanes and Mechanism for Kinetics Inverse Between Anionic and Cationic Ring-Opening Polymerization
作者: Fei, Hua-Feng1, 2; Han, Xiaojie1, 2; Liu, Bozheng1, 2; Gao, Xiyin1; Wang, Qian1; Zhang, Zhijie1; Xie, Zemin1
关键词: gradient copolymer ; kinetics analysis ; mechanism ; polysiloxane ; reactivity ratio ; ring-opening polymerization
刊名: JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
发表日期: 2016-03-15
卷: 54, 期:6, 页:835-843
收录类别: SCI
英文摘要: Trifluoropropylmethylsiloxane-phenylmethylsiloxane gradient copolysiloxanes were synthesized by anionic and cationic ring-opening polymerization (ROP) of 1,3,5-tris(trifluoropropylmethyl) cyclotrisiloxane (D-3(F)) and phenylmethylcyclotrisiloxane (D-3(Ph)). The analysis of reactivity ratios revealed that the reactivity of D-3(F) toward anionic ROP was higher than that of D-3(Ph); however, D-3(F) exhibited lower reactivity compared with D-3(Ph) during the cationic ROP. AB and BAB type gradient copolymers were obtained because of a difference in the reactivity of the monomers. The microstructure of copolymers was character-ized by Si-29 NMR spectroscopy, gel permeation chromatography, and differential scanning calorimetry. Furthermore, the mechanism for kinetics inverse of copolymerization was proposed based on the results of the optimized molecular configuration. (C) 2015 Wiley Periodicals, Inc.
语种: 英语
内容类型: 期刊论文
URI标识: http://ir.iccas.ac.cn/handle/121111/35803
Appears in Collections:高技术材料实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Chem, Lab Adv Polymer Mat, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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