Impedance spectroscopy of reactive polymers. 3. Correlations between dielectric, spectroscopic, and rheological properties during cure of a trifunctional epoxy resin

Jovan Mijović, Saša Andjelić, Benjamin Fitz, Walter Zurawsky, Iñaki Mondragon, Francesco Bellucci, Luigi Nicolais

Research output: Contribution to journalArticle

Abstract

An investigation was carried out of correlations between dielectric, vibrational spectroscopic, and rheological properties during cure of a thermoset formulation composed of trifunctional epoxy resin and tetrafunctional amine. Experimental techniques utilized include impedance spectroscopy, near-infrared spectroscopy, steady shear, and dynamic mechanical measurements. Reaction kinetics obtained from dielectric and spectroscopic results were in excellent agreement. Gelation and vitrification times determined by dielectric and rheological measurements were also found to agree very well, despite the empirical nature of such correlations. A characteristic pattern in plots of imaginary impedance as a function of reaction time was reported for the first time in the open literature, and it was suggested that it could be used to identify gelation and vitrification during the network formation. A realization of the full potential of dielectric impedance spectroscopy in monitoring the progress of chemophysical changes in reactive polymers, however, hinges upon a development of fundamental scientific correlations between dielectric and chemorheological phenomena during cure.

Original languageEnglish (US)
Pages (from-to)379-388
Number of pages10
JournalJournal of Polymer Science, Part B: Polymer Physics
Volume34
Issue number2
DOIs
StatePublished - Jan 1 1996

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Keywords

  • Impedance spectroscopy
  • Reactive polymers
  • Rheological properties
  • Trifunctional epoxy resin

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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