کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1484933 1510532 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Study of dielectric relaxations in cellulose by combined DDS and TSC
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Study of dielectric relaxations in cellulose by combined DDS and TSC
چکیده انگلیسی

In this work, thermally stimulated currents (TSC) analyses combined with dynamic dielectric spectroscopy (DDS) have been applied to the investigation of molecular mobility of cellulose. The correlation between results obtained by both methods allows us to attribute the low temperature DDS relaxation mode to the γ-mode resolved in TSC. The values of its activation parameters point out that the chain mobility remains localized. At high temperature, the various dielectric relaxation phenomena are separated by applying a recent analytical protocol. The comparison between the activation enthalpy values obtained by DDS and TSC leads to the assignment of the so-called α-mode to cooperative movements of polymeric sequences. The Arrhenius behavior of α-relaxation time is explained using the strong/fragile pattern. The influence of water content on secondary and primary relaxation modes was examined as well.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 353, Issues 44–46, 15 November 2007, Pages 4108–4115
نویسندگان
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