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Dielectrical and electro-mechanical behavior of NBR at high electric field strength
Polymer Testing ( IF 5.1 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.polymertesting.2020.106639
N. Vennemann , C. Kummerlöwe , M. Mertes , F. Kühnast , D. Bröker , A. Siebert

Abstract The aim of this work is to present a new approach to characterize the dielectric properties of elastomers especially at low frequencies and high electric field strength, close to the operating conditions of dielectric elastomer actuators (DEA). By means of an electro-rheological measuring cell, static (DC) and alternating (AC) high electric field strength were applied to different types of acrylonitrile-butadiene rubbers (NBR), with varying content of polar acrylonitrile groups. Based on fundamental theory of electricity complex permittivity and polarization were calculated from Coulomb stress measurements at varying frequencies. During high voltage measurements it was observed, that dielectric loss current increases, if a certain critical field strength is exceeded. It is shown, that polar NBR rubbers exhibit a critical field strength far below of the non-polar polybutadiene rubber (BR), acting as a reference sample. NBR exhibits extraordinary high permittivity at low frequency, which makes this material as a favorite candidate for DEA. Furthermore, mechanical properties of NBR can be easily altered by application of an alternating electric field. This phenomenon opens new opportunities in a great variety of applications.

中文翻译:

NBR在高电场强度下的介电和机电行为

摘要 这项工作的目的是提出一种新方法来表征弹性体的介电特性,尤其是在低频和高电场强度下,接近介电弹性体致动器 (DEA) 的工作条件。通过电流变测量池,将静态 (DC) 和交流 (AC) 高电场强度应用于不同类型的丙烯腈 - 丁二烯橡胶 (NBR),具有不同的极性丙烯腈基团含量。基于电的基本理论,复介电常数和极化由不同频率下的库仑应力测量值计算得出。在高压测量期间观察到,如果超过某个临界场强,介电损耗电流会增加。它显示,极性丁腈橡胶表现出的临界场强远低于非极性聚丁二烯橡胶 (BR),作为参考样品。NBR 在低频下表现出非凡的高介电常数,这使得这种材料成为 DEA 的首选材料。此外,NBR 的机械性能可以通过施加交变电场轻松改变。这种现象为各种各样的应用开辟了新的机会。
更新日期:2020-10-01
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