کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5190083 1381196 2006 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dielectric relaxation behavior of poly(acrylonitrile-co-methacrylonitrile) microcapsules dispersed in a silicone matrix
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Dielectric relaxation behavior of poly(acrylonitrile-co-methacrylonitrile) microcapsules dispersed in a silicone matrix
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 11, 17 May 2006, Pages 4218-4229
نویسندگان
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