Influence of composition on relaxor ferroelectric and electromechanical properties of poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene)
Influence of composition on relaxor ferroelectric and electromechanical properties of poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene)
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DOI：
10.1063/1.1882769
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发表时间：
2005-05-01
影响因子：
3.2
通讯作者：
Bauer, F
中科院分区：
文献类型：
--
作者：
Klein, RJ;Xia, F;Bauer, F
研究了聚偏氟乙烯-三氟乙烯-氯氟乙烯（PVDF-TrFE-CFE）铁电性能和机电性能的影响，特别是氯氟乙烯的含量。结果表明，当CFE从0增加到9 mol %时，共聚物（VDF/TrFE摩尔比在64/36 ~ 75/25之间）的正铁电性逐渐转变为弛豫铁电性，形成了几乎无迟滞的极化环和高电伸缩响应。另一方面，CFE含量的增加会导致结晶度的降低，从而影响聚合物的弹性模量和诱导极化水平。这些相互竞争的效应决定了给定应用所需的三元共聚物组成。采用修正的电致伸缩关系建立了电致应变随诱导极化和大极性相分数的函数模型，与实验数据吻合较好。发现在所研究的组合物中，电致伸缩系数是相对恒定的。(C) 2005美国物理研究所。
We investigate the influence of the composition, especially the chlorofluoroethylene content, on the ferroelectric and electromechanical properties of the poly(vinylidene fluoride-trifluoroethylene- chlorofluoroethylene) (PVDF-TrFE-CFE). It was found that increasing the CFE from 0 to 9 mol % gradually converts the normal ferroelectric of the copolymer (in the compositions range of VDF/TrFE mole ratio between 64/36 to 75/25) to a relaxor ferroelectric, resulting in a nearly hysteresis free polarization loop and high electrostrictive response. On the other hand, increasing CFE content causes reduction in crystallinity, which will affect the elastic modulus and the induced polarization level of the polymer. These competing effects determine the desired terpolymer compositions for given applications. The electromechanical strain as a function of induced polarization and macropolar phase fraction was modeled by a modified electrostrictive relation, which closely matches experimental data. It is found that the electrostrictive coefficient is relatively constant across the compositions investigated. (C) 2005 American Institute of Physics.