Gelation in thermosets formed by chain addition polymerization

M. S. Heise, G. C. Martin, J. T. Gotro

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The physical behavior of the diglycidyl ether of bisphenol A, cured with different concentrations of 2‐ethyl‐4‐methylimidazole, was examined with dynamic mechanical and dielectric analyses, differential scanning calorimetry, and solvent extraction studies, ‘The network formation process was shown to depend strongly on the imidazole concentration’. At high imidazole concentrations, the gel point was characterized by a decrease in sol fraction, the crossover of the dynamic moduli and a rapid increase in viscosity. At low imidazole concentrations, the viscosity remained low until the sol fraction approached zero. For this system, the gel point, which occurred prior to the dynamic moduli crossover, was characterized by comparing the thermal properties of the network with the viscosity and dielectric behavior of the resin system during cure.

Original languageEnglish (US)
Pages (from-to)83-89
Number of pages7
JournalPolymer Engineering & Science
Volume30
Issue number2
DOIs
StatePublished - Jan 1990

ASJC Scopus subject areas

  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

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