Dielectric relaxation behavior of poly(acrylonitrile-co-methacrylonitrile) microcapsules dispersed in a silicone matrix

Taigyoo Park, Emmett O'Brien, Jeremy R. Lizotte, Thomas E. Glass, Thomas C. Ward, Timothy E. Long, Donald J. Leo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The dielectric relaxation behavior of poly(acrylonitrile-co-methacrylonitrile) dispersed in a cured polydimethyl siloxane (PDMS) matrix as microcapsules was investigated over multiple thermal cycles and at varying concentrations. The copolymer microcapsules contained an isopentane core. In the PDMS matrix this copolymer displayed a pronounced relaxation signal at temperatures above the glass transition of the copolymers due to Maxwell-Wagner-Sillars (MWS) relaxation. The mechanism of MWS relaxation interpreted by the Havriliak-Negami and Kohlrausch-Williams-Watts relaxation functions was found to be very similar to previous studies of neat polyacrylonitrile and its copolymer. The activation energy of the relaxation decreased over successive thermal cycling coincident with a decreasing strength of the relaxation. These observations were attributed to the decreasing concentration of nitrile groups due to intramolecular cyclizations.

Original languageEnglish (US)
Pages (from-to)4218-4229
Number of pages12
JournalPolymer
Volume47
Issue number11
DOIs
StatePublished - May 17 2006
Externally publishedYes

Keywords

  • Copolymer
  • Dielectric relaxation behavior
  • Polyacrylonitrile

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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