Thermomechanical and hygroelastic properties of an epoxy system under humid and cold-warm cycling conditions

Jalal El Yagoubi, Gilles Lubineau, Shahid Saghir, Jacques Verdu, Abe H. Askari

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

In this paper, we study the hygrothermal aging of an anhydride-cured epoxy under temperature and hygrometry conditions simulating those experienced by an aircraft in wet tropical or subtropical regions. Gravimetric and dimensional measurements were performed and they indicate that there are three stages in this aging process: the first one, corresponding to the early cycles can be called the "induction stage". The second stage of about 1000 cycles duration, could be named the "swelling stage", during which the volume increase is almost equal to the volume of the (liquid) water absorbed. Both the first and second stages are accompanied by modifications of the mechanical properties and the glass transition temperature. During the third ("equilibrium") stage, up to 3000 cycles, there is no significant change in the physical properties despite the continuous increase of water uptake. This can be explained by the fact that only physically sorbed water can influence physical properties. © 2013 Elsevier Ltd. All rights reserved.
Original languageEnglish (US)
Pages (from-to)146-155
Number of pages10
JournalPolymer Degradation and Stability
Volume99
Issue number1
DOIs
StatePublished - Jan 2014

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Mechanics of Materials
  • Condensed Matter Physics

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