Microstructures and Dielectric Properties of the Ferroelectric Fluoropolymers Synthesized via Reductive Dechlorination of Poly(vinylidene fluoride-co-chlorotrifluoroethylene)s

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• 作者：Yingying Lu ; Jason Claude ; Qiming Zhang ; Qing Wang
• 刊名：Macromolecules
• 出版年：2006
• 出版时间：October 3, 2006
• 年：2006
• 卷：39
• 期：20
• 页码：6962 - 6968
• 全文大小：144K
• 年卷期：v.39,no.20(October 3, 2006)
• ISSN：1520-5835

文摘

Ferroelectric fluoropolymers containing vinylidene fluoride (VDF), trifluoroethylene (TrFE), andchlorotrifluoroethylene (CTFE) have been prepared over a wide composition range by a two-step approachconsisting of copolymerization of VDF and CTFE and a subsequent reductive dechlorination reaction. Due to thesimilar reactive ratios between VDF and CTFE and quantitative dechlorination yields, the chemical structuresand compositions of the resulting terpolymers can be precisely controlled. The structural characteristics includingmicrostructure, chain conformation, and crystallinity of the polymers have been carefully elucidated as a functionof the chemical composition by ¹H and ¹⁹F NMR, Fourier transform infrared spectroscopy, and wide-angleX-ray diffraction. The influence of the polymer compositions on thermal transitions and dielectric constantshas also been investigated. A Curie temperature of 23 C and dielectric constant of 50 measured at ambienttemperature and 1 kHz have been achieved at the terpolymer composition of 78.8 mol % VDF, 14 mol % CTFE,and 7.2 mol % TrFE.