کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5189524 | 1381186 | 2006 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dependence of zero-shear viscosity and steady-state compliance on molecular weight between entanglements for ethylene-cycloolefin copolymers
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Dynamic viscoelastic properties of a series of cyclic olefin copolymers have been investigated. The specimens differ in total molecular weight as well as molecular weight between entanglements. The angular frequency (Ï) dependence curves of dynamic storage and loss moduli (Gâ² and Gâ³, respectively) of the specimens have shown that Gâ² â Ï2 and Gâ³ â Ï in the terminal region, and a plateau region at high Ï. On the basis of the experimental results, the dependence of total molecular weight as well as molecular weight between entanglements has been examined for zero-shear viscosity (η0) and steady-state compliance (Je). It is shown that η0âMe1.5(Mw/Me)3.5 for the melts of the copolymers in the entangled regime, Mw being the weight-average molecular weight and Me the molecular weight between entanglements. The steady-state compliance Je for the melts scales with Me and Mw as JeâMe0.5(Mw/Me)0.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 13, 14 June 2006, Pages 4811-4815
Journal: Polymer - Volume 47, Issue 13, 14 June 2006, Pages 4811-4815
نویسندگان
Toshikazu Takigawa, Hidenori Kadoya, Takashi Miki, Takashi Yamamoto, Toshiro Masuda,