材料科学
铁电性
结晶度
相图
复合材料
居里温度
结晶
退火(玻璃)
聚偏氟乙烯
混溶性
聚合物混合物
玻璃化转变
氟化物
热稳定性
高分子化学
相(物质)
化学工程
共聚物
聚合物
电介质
铁磁性
有机化学
凝聚态物理
化学
光电子学
无机化学
物理
工程类
作者
Mengyuan Li,Natalie Stingelin,Jasper J. Michels,Mark-Jan Spijkman,Kamal Asadi,Kirill Feldman,Paul W. M. Blom,Dago M. de Leeuw
出处
期刊:Macromolecules
[American Chemical Society]
日期:2012-09-04
卷期号:45 (18): 7477-7485
被引量:99
摘要
We have investigated the ferroelectric phase diagram of poly(vinylidene fluoride) (PVDF) and poly(methyl methacrylate) (PMMA). The binary nonequilibrium temperature composition diagram was determined and melting of α- and β-phase PVDF was identified. Ferroelectric β-PVDF:PMMA blend films were made by melting, ice quenching, and subsequent annealing above the glass transition temperature of PMMA, close to the melting temperature of PVDF. Addition of PMMA suppresses the crystallization of PVDF and, as a consequence, the roughness of blend films was found to decrease with increasing PMMA content. Using time-dependent 2D numerical simulations based on a phase–field model, we qualitatively reproduced the effect of PMMA on the crystallization rate and the spherulite shape of PVDF. The remnant polarization scaled with the degree of crystallinity of PVDF. The thermal stability of the polarization is directly related to the Curie temperature. We show that, at high temperature, the commodity ferroelectric PVDF:PMMA blends outperform the commonly employed specialty copolymer poly(vinylidene fluoride–trifluoroethylene) (P(VDF–TrFE)).
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