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首页> 外文期刊>Journal of Applied Polymer Science >The Variation of the Dielectric Constant and Loss Index with Temperature and Draw Ratio in a-PVDF
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The Variation of the Dielectric Constant and Loss Index with Temperature and Draw Ratio in a-PVDF

机译：a-PVDF中介电常数和损耗指数随温度和拉伸比的变化

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摘要

In this study, the effect of measurement temperature and uniaxial drawing on the real (dielectric constant, e0) and imaginary (loss index, e00) parts of the complex dielectric constant of a-crystalline phase poly(vinylidene fluoride) (PVDF) was investigated. The samples having different draw ratios (k) were obtained by drawing the PVDF film at constant speed and temperature. The dielectric measurements were performed in the frequency range of 100 Hz–1 MHz and in the temperature range of 80–400 K. Although e0 and e00 were not affected by the orientation process during the b-relaxation transition, it was observed that there were systematical variations for the a-relaxation transition. e0 and e00 showed different behaviors depending on the draw ratio at different temperatures. Especially, e00 was more affected by the orientation process at 380 K.
机译：在这项研究中，研究了测量温度和单轴拉伸对a晶相聚偏二氟乙烯（PVDF）复数介电常数的实部（介电常数，e0）和虚部（损耗指数，e00）的影响。通过以恒定的速度和温度拉伸PVDF膜，获得具有不同拉伸比（k）的样品。介电测量在100 Hz-1 MHz的频率范围和80-400 K的温度范围内进行。尽管e0和e00不受b弛豫过渡过程中取向过程的影响，但观察到存在a松弛过渡的系统变化。 e0和e00表现出不同的行为，具体取决于在不同温度下的拉伸比。特别是，e00受380 K取向过程的影响更大。

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