کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5206342 1382305 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Material behaviourNon-isothermal crystallization of polyethylene blends with bimodal molecular weight distribution
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Material behaviourNon-isothermal crystallization of polyethylene blends with bimodal molecular weight distribution
چکیده انگلیسی

Non-isothermal crystallization of polyethylene (PE) blends with bimodal molecular weight distribution (MWD) was investigated by differential scanning calorimetry (DSC) at various scanning rates. The bimodal PE blends were prepared by blending two unimodal polyethylenes with large difference in molecular weigh in different ratio in xylene solution. Different kinetic parameters such as the half-time of crystallization (t1/2), crystallization rate constant (Zc), F(T) and the effective activation energy were determined. Some complicated relationships between these parameters and the average molecular weight were found. The crystallization rate first increased and reached a maximum then decreased, and also correlated with the MWD. The Avrami index under non-isothermal conditions was analyzed with a method developed by Harnisch and Muschik; the results indicated that homogeneous nucleation and spherulitic growth regimes were present in all samples studied.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 32, Issue 8, December 2013, Pages 1385-1391
نویسندگان
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