Cure kinetics of epoxy formulations of the type used in advanced composites

Jovan Mijović, Jinhwan Kim, John Slaby

Research output: Contribution to journalArticle

Abstract

An analysis of the cure kinetics of three different formulations composed of tetraglycidyl 4,4′‐diaminodiphenyl methane (TGDDM) epoxy resin and diaminodiphenyl sulfone (DDS) was performed. A series of isothermal tests was run, and the experimentally obtained results were checked against the proposed kinetic model. An autocatalyzed mechanism with the overall reaction order of 2 was found to adequately describe the cure kinetics. An increase in reaction rate was observed at higher temperature and higher DDS concentration. For a given formulation, the extent of reaction corresponding to the maximum reaction rate was independent of temperature. A secondary exotherm was detected, particularly in formulations with low DDS concentration, at approximately 40% conversion. At that point, the rate of primary amine–epoxide reaction decreases, and other reactions dominate the curing process. Such a mechanism is likely to cause a formation of an inhomogeneous thermoset morphology.

Original languageEnglish (US)
Pages (from-to)1449-1462
Number of pages14
JournalJournal of Applied Polymer Science
Volume29
Issue number4
DOIs
StatePublished - Apr 1984

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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