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Dielectric analysis of water uptake in polymer coating using spatially defined Fick's law and mixing rule
Progress in Organic Coatings ( IF 6.6 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.porgcoat.2020.105846
Lucas Ollivier-Lamarque , Mickaël Lallart , Nicolas Mary , Tetsuya Uchimoto , Sébastien Livi , Sabrina Marcelin , Hiroyuki Miki

Abstract Due to their outstanding properties such as thermal insulation, optical transparency or adhesion for instance, thermosetting coatings based on epoxy prepolymers offer many attractive advantages. In the framework of investigating their ageing under wet conditions, this study exposes an original approach taking into account the water penetration depth. This allows the derivation of local permittivity using mixing rule, ultimately yielding a physically-based explanation of the globally measured capacitance of immersed polymer coupons placed between circular electrodes and its link to gravimetric results. Theoretical predictions show good agreement with experimental measurements on epoxy-amine coupons both in terms of mass uptake and dielectric constants (including frequency dependence), bringing new insights in uptake mechanisms and associated measurement techniques.

中文翻译:

使用空间定义的菲克定律和混合规则对聚合物涂层中的吸水率进行介电分析

摘要 由于具有出色的隔热性、透光性或附着力等特性,基于环氧预聚物的热固性涂料具有许多吸引人的优势。在研究它们在潮湿条件下的老化的框架内,这项研究揭示了一种考虑到水渗透深度的原始方法。这允许使用混合规则推导局部介电常数,最终对放置在圆形电极之间的浸入式聚合物试样的全局测量电容及其与重量测量结果的联系产生基于物理的解释。理论预测在质量吸收和介电常数(包括频率依赖性)方面与环氧胺试样的实验测量结果非常一致,
更新日期:2020-11-01
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