کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
674336 1459556 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Crystallization behavior of random ethylene–butene copolymers modified with organic peroxide
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Crystallization behavior of random ethylene–butene copolymers modified with organic peroxide
چکیده انگلیسی

The effect of molecular cross-linking on the crystallization of random ethylene–1-butene copolymers obtained from hydrogenation of model polybutadiene was studied by means of differential scanning calorimetry. The copolymers were modified with different concentrations of organic peroxide in the molten state to generate different crosslink levels. Under isothermal conditions, the crystallization rate of the modified polymers decreased with the average molecular weight likewise to that observed in the unmodified copolymers. Original and modified polymers show similar isothermal crystallization rates when compared to equivalent weight average molecular weights. Under no isothermal crystallization conditions, the temperature and the enthalpy of crystallization of the modified polymer decreased almost linearly with the concentration of peroxide. The activation energy for crystallization increased with the concentration of peroxide indicating that the increment in molecular crosslinking restricts the crystallization process.


► Crystallization of crosslinked ethylene–1-butene copolymers was studied.
► Crystallization rate depends of the molecular weight at constant temperature.
► In dynamic conditions, the Tc and ΔH decreased with the peroxide concentration.
► The Ea for crystallization decreases with the peroxide concentration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 528, 20 January 2012, Pages 15–22
نویسندگان
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