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首页> 外文期刊>Journal of Applied Polymer Science >Improved dielectric properties of poly(vinylidene fluoride)-BaTiO3 composites by solvent-free processing
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Improved dielectric properties of poly(vinylidene fluoride)-BaTiO3 composites by solvent-free processing

机译：通过无溶剂加工改善聚（偏二氟乙烯）-batiO3复合材料的介电性能

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摘要

Composites of poly(vinylidene fluoride) (PVDF) and BaTiO3 nanoparticles (average diameter ca. 125 nm) are fabricated by a solvent-free and industrially scalable technique, that is, melt blending, followed by compression molding. The effect of processing parameters on the spectroscopic, microstructural, thermal, mechanical and dielectric properties are evaluated as a function of composition (loading up to 30 vol%). The presence of nanoparticle inclusions as well as specific compression molding parameters demonstrate both to affect the molecular relaxations of the PVDF matrix, studied by correlating the results of different techniques, and to induce the PVDF crystallization as beta phase. Processing parameters also play a key role for optimizing the dielectric properties. An improved dielectric behavior of the composites is obtained in terms of both permittivity, whose value increases up to four times that of neat PVDF, and dielectric losses, lower than 5% between 10 and 3 center dot 10(4) Hz. The obtained performances resulted enhanced compared to analogous composites prepared with the use of solvents.
机译：聚偏氟乙烯（PVDF）和钛酸钡纳米颗粒（平均直径约为125 nm）的复合材料是通过无溶剂和工业可扩展技术制备的，即熔融共混，然后压缩成型。工艺参数对光谱、微观结构、热性能、机械性能和介电性能的影响作为成分的函数进行评估（负载量高达30 vol%）。纳米颗粒夹杂的存在以及特定的压缩成型参数表明，两者都会影响PVDF基体的分子弛豫（通过关联不同技术的结果进行研究），并诱导PVDF结晶为β相。工艺参数对优化介电性能也起着关键作用。在介电常数和介电损耗方面，复合材料的介电性能得到了改善，介电常数的值增加到纯PVDF的四倍，介电损耗在10和3中心点10（4）Hz之间低于5%。与使用溶剂制备的类似复合材料相比，所获得的性能得到了增强。

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