کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5183528 1381021 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of the degree of branching on the glass transition temperature of polyesters
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Effect of the degree of branching on the glass transition temperature of polyesters
چکیده انگلیسی

Glass transition temperature dependence on the branching degree can be empirically estimated by excluding additional effects on this parameter as molecular weight distribution, end group interactions or crystallization. In this communication aliphatic-aromatic polyesters with a well defined degree of branching between 0% (linear) and 50% (hyperbranched) are investigated by differential scanning calorimetry. The hydrogen bonding effect of the OH-terminal groups was successfully extracted from the pure branching effect by protection of the end-functionalities. Fractionation of samples with variation of the branching degree and end-functionalities led to series of narrowly distributed molar masses. The dependence of the molecular weight on the glass transition temperature for different branching degrees was calculated and compared for polar and non-polar end groups.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 53, Issue 5, 28 February 2012, Pages 1049-1053
نویسندگان
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