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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Microscopic origin of the high-strain mechanical response of poled and non-poled poly(vinylidene fluoride) in the beta-phase
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Microscopic origin of the high-strain mechanical response of poled and non-poled poly(vinylidene fluoride) in the beta-phase

机译：β相中极化和非极化聚偏二氟乙烯的高应变机械响应的微观起源

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Tensile mechanical tests have been applied to poled and non-poled poly (vinylidene fluoride) in its P-phase at several temperatures and strain rates, along the main directions of the material, in order to relate the mechanical response with the microscopic variations of the material, as well as to evaluate the performance of the material under use in different applications and environments. Poling increases mechanical strength along the preferential orientation of the microstructure but does not affect significantly the transversal mechanical properties. By increasing temperature, the effect of poling on the mechanical response is reduced due to increased molecular mobility and consequent de-poling of the system. The activation volume and enthalpy at yielding were calculated within the Eyring formalism. It is concluded that poling increases interaction among dipolar moments within the crystalline lamella and with the surrounding interphase and therefore increases cooperativity. This fact is also demonstrated by the decrease of the KWW beta-exponent obtained from the stress-relaxation experiments. (c) 2008 Elsevier B.V. All rights reserved.
机译：沿材料的主要方向，在几种温度和应变速率下，对极化和非极化聚偏二氟乙烯在其P相中进行了拉伸机械测试，以便将机械响应与材料的微观变化联系起来。材料，以及评估在不同应用程序和环境中使用的材料的性能。极化会沿着微结构的优先方向增加机械强度，但不会显着影响横向机械性能。通过提高温度，由于分子迁移率的提高和系统的去极化作用，极化对机械响应的影响得以降低。在Eyring形式主义中计算活化体积和屈服焓。结论是极化增加了晶体薄片内的偶极矩之间的相互作用以及与周围相的相互作用，因此增加了协同性。从应力松弛实验获得的KWWβ指数的减少也证明了这一事实。 （c）2008 Elsevier B.V.保留所有权利。

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