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首页> 外文期刊>Journal of Applied Polymer Science >Features of Structure Formation and Electrophysical Properties of Poly(vinylidene fluoride) Crystalline Ferroelectric Polymers
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Features of Structure Formation and Electrophysical Properties of Poly(vinylidene fluoride) Crystalline Ferroelectric Polymers

机译：聚偏二氟乙烯结晶铁电聚合物的结构形成和电物理性质

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摘要

The influence of intramolecular dipole–dipole interaction changes on structure formation peculiarities and some electrophysical properties were investigated with example of copolymers of vinylidene fluoride with tetrafluoroethylene and hexafluoropropylene with different compositions. The decrease of such dipole–dipole interactions in vinylidene fluoride/tetrafluoroethylene copolymers leads to an increase of the a and b parameters of the ferroelectric phase lattice and were accompanied by a shift of the Curie point to lower temperatures. The presence of peak-halo at angles near 2y 18 were attributed to a paraelectric phase localized in the interfacial domains at the crystal–amorphous phase boundaries. Similar peak-halos for vinylidene fluoride/hexafluoropropylene copolymers crystallizing into the nonpolar a phase were associated with the presence of an antiferroelectric phase formed by the chains in the planar zigzag conformation. The temperature range where dielectric anomalies were detected was characterized by conformational changes at which the decrease in planar zigzag conformation isomers took place.
机译：以不同成分的偏二氟乙烯与四氟乙烯和六氟丙烯的共聚物为例，研究了分子内偶极-偶极相互作用的变化对结构形成特性和某些电物理性质的影响。偏二氟乙烯/四氟乙烯共聚物中此类偶极-偶极相互作用的减少导致铁电相晶格的a和b参数增加，并伴随着居里点向较低温度的移动。在接近2y 18的角度出现峰晕的原因是顺电相位于晶体-非晶相边界的界面域中。结晶成非极性a相的偏二氟乙烯/六氟丙烯共聚物的类似峰卤与平面锯齿形构象的链形成的反铁电相的存在有关。通过构象变化来表征检测到介电异常的温度范围，在该构象变化处平面Z字形构象异构体减少。

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