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 Edward Long, Donald J. Leo

研究成果: Article査読

3 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)4218-4229
ページ数12
ジャーナルPolymer
47
11
DOI
出版ステータスPublished - 2006 5 17
外部発表はい

ASJC Scopus subject areas

  • ポリマーおよびプラスチック
  • 有機化学

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