کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5183698 1381025 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fracture behavior of bimodal polyethylene: Effect of molecular weight distribution characteristics
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Fracture behavior of bimodal polyethylene: Effect of molecular weight distribution characteristics
چکیده انگلیسی

A series of bimodal polyethylenes with different molecular weight distribution characteristics were prepared by melt blending, and the fracture behavior of these bimodal polyethylenes was studied by the method of essential work of fracture. The results show that specific essential work of fracture, we, increases obviously with the molecular weight distribution characteristic, AL/U, indicating the improvement of the resistance to crack propagation. By means of successive self-nucleation and annealing analysis, obvious variations in the crystal structures of bimodal polyethylenes with increasing AL/U have been found. That is, the crystal size and the amount of relatively thick lamellas increase with AL/U, but no large variation of crystallinities has been observed. So, the influence of AL/U is mainly on the crystal perfection, the improvement of which produces an enhancement of fracture toughness since more energy would be dissipated in the superior network structure constructed from crystalline zones and amorphous zones.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 52, Issue 2, 21 January 2011, Pages 564-570
نویسندگان
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