Dielectric analysis of water uptake in polymer coating using spatially defined Fick's law and mixing rule

Lucas Ollivier-Lamarque, Mickaël Lallart, Nicolas Mary, Tetsuya Uchimoto, Sébastien Livi, Sabrina Marcelin, Hiroyuki Miki

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number105846
JournalProgress in Organic Coatings
Volume148
DOIs
Publication statusPublished - 2020 Nov

Keywords

  • Dielectric analysis
  • Gravimetry
  • Polymer coating
  • Thermosetting coating
  • Water uptake

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Surfaces, Coatings and Films
  • Organic Chemistry
  • Materials Chemistry

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