کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5186741 1502552 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Crystallization under shear in isotactic polypropylene containing nucleators
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Crystallization under shear in isotactic polypropylene containing nucleators
چکیده انگلیسی

We report results from time-resolved small/wide angle X-ray scattering of well-characterized isotactic polypropylene (iPP), in its pure form as well as loaded with nucleating additives of different shapes (isotropic, elongated, platelet-like). Isothermal crystallization of these systems has been studied both under quiescent conditions and after application of a shear pulse. A quantitative analysis is presented that couples the applied shear field and the specific additive to the nucleation of iPP and the subsequent kinetics of crystallization. The effect of flow is only relevant if its contribution to the nucleation density is at least of the same order of magnitude as the nucleation density under quiescent conditions. Anisotropic additives show strong interactions with the flow field leading to extra nucleating sites.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 49, Issues 13–14, 23 June 2008, Pages 3076-3083
نویسندگان
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