Electromechanical Properties of Relaxor Ferroelectric P(VDF-TrFE-CFE)-P(VDF-CTFE) Blends
Electromechanical Properties of Relaxor Ferroelectric P(VDF-TrFE-CFE)-P(VDF-CTFE) Blends
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DOI：
10.1109/tuffc.2013.2587
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发表时间：
2013-03-01
影响因子：
3.6
通讯作者：
Lin, Minren
中科院分区：
文献类型：
--
作者：
Gorny, Lee J.;Lu, Sheng-Guo;Lin, Minren
研究了弛豫型铁电材料聚偏氟乙烯-三氟乙烯-氯乙烯共聚物[P（VDF-TrFE-CFE）]与少量弹性模量比纯铁电材料高得多的聚偏氟乙烯-三氟氯乙烯共聚物[P（VDF-CTFE）]共混后的机电性能。据观察，少量的P（VDF-CTFE）的存在不影响结晶相的微观结构。然而，单轴拉伸的共混膜显示出轻微的结晶度增加和增加或类似的诱导极化在高电场相比，纯的聚乙烯，可能是由界面效应引起的。因此，对于P（VDF-CTFE）小于5wt%的共混物，单轴拉伸共混膜沿着拉伸方向的横向应变S-1与纯P（VDF-TrFE-CFE）的横向应变S-1几乎相同，而沿着S-1方向的弹性模量随着P（VDF-CTFE）含量的增加而增加。结果，与纯聚乙烯相比，共混膜表现出更高的弹性能量密度和机电耦合因子κ（31）。
Electromechanical properties of the relaxor ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) [P(VDF-TrFE-CFE)] terpolymer blended with a small amount of poly(vinylidene fluoride-chlorotrifluoroethylene) [P(VDF-CTFE)] copolymer, which possesses a much higher elastic modulus than that of the neat terpolymer, were investigated. It was observed that the presence of small amount of P(VDF-CTFE) does not affect the microstructure of the crystalline phase. However, the uniaxially stretched blended films show a slight increase in the crystallinity and increased or similar induced polarization at high electric fields compared with the neat terpolymer, likely caused by the interface effect. Consequently, for blends with P(VDF-CTFE) less than 5 wt%, the transverse strains S-1 along the stretching direction for uniaxially stretched blended films are nearly the same as those of neat P(VDF-TrFE-CFE), whereas the elastic modulus along the S-1-direction increases with the P(VDF-CTFE) content. As a result, the blended films exhibit a higher elastic energy density and electromechanical coupling factor kappa(31) compared with the neat terpolymer.