Dielectric relaxation spectroscopy of reactive network-forming polymers

Benjamin D. Fitz, Jovan Mijovic

Research output: Contribution to journalArticle

Abstract

Dipole dynamics in network-forming epoxy-amine formulations were investigated by dielectric relaxation spectroscopy. The unreacted liquid monomer mixture was characterized by a single αβ process at high frequencies. The αβ relaxation peak broadens with the progress of chemical reactions and separates into two peaks: a which shifts to lower frequencies and longer relaxation times, and a second peak at high frequency (megahertz range) of diminishing intensity, but essentially unchanging relaxation time. The most probable relaxation times were calculated and plotted as a function of reciprocal temperature resulting in activation energy plots. It was shown that the splitting of the αβ process into α and β processes can be brought about by either cooling a liquid without changing its structure, or continuing chemical reactions (i.e. changing the structure) while maintaining a constant temperature.

Original languageEnglish (US)
Pages (from-to)721-726
Number of pages6
JournalPolymers for Advanced Technologies
Volume9
Issue number10-11
DOIs
StatePublished - 1998

Keywords

  • Dielectric relaxation
  • Dipole dynamics
  • Glass former
  • Reactive networks

ASJC Scopus subject areas

  • Polymers and Plastics

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