کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1484807 1510531 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dielectric secondary relaxation and phenylene ring dynamics in bisphenol-A polycarbonate
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Dielectric secondary relaxation and phenylene ring dynamics in bisphenol-A polycarbonate
چکیده انگلیسی

A detailed dielectric investigation of the secondary relaxation on a series of bisphenol-A polycarbonate samples with different treatments that influence the local polymer structure is presented. Dielectric spectroscopy measurements were performed in the frequency range 10−2–106 Hz. The structural changes induced by different thermo-mechanical treatments, as well as by polymer crystallization, lead to a reduction of the dielectric losses that is not uniform over the whole frequency range but more pronounced in the high frequency side of the γ-relaxation peak. These effects have been rationalized in terms of the great coupling between the motions of the phenylene rings and those of the dipolar entity of the repeating unit (namely the carbonate group). Furthermore, it is shown that the same approach allows rationalizing the marked differences between the dielectric and mechanical secondary relaxations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 353, Issues 47–51, 1 December 2007, Pages 4262–4266
نویسندگان
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