کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5190569 | 1381211 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Power law and scaling for molecular weight dependence of crystal growth rate in polymeric materials
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The molecular weight (M) dependence of the linear crystal growth rate (G) and the influence of the super-cooling on the relationship between M and G were studied. The molecular weight dependence of G has been expressed generally as GâMα at a given super-cooling. The temperature dependence of G shows a bell shape with the maximum growth rate (Gmax). The value of α was â0.5 at the temperature (Tcmax) of Gmax. However, the small super-cooling and the small molecular weight gave a large negative value of α. In other words, the value of α was dependent not only on the degree of super-cooling (ÎT) but also on the molecular weight. The effect on α by these two factors (ÎT and M) goes off to zero at Tcmax and α yields to â0.5. Gmax can be defined as a characteristic intrinsic value to the crystal growth behavior. The molecular weight dependence of Gmax was scaled and expressed as a â0.5 power to molecular weight for all crystalline polymers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 46, Issue 20, 23 September 2005, Pages 8790-8795
Journal: Polymer - Volume 46, Issue 20, 23 September 2005, Pages 8790-8795
نویسندگان
S. Umemoto, N. Okui,