کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5207377 | 1382348 | 2008 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Melt rheology and extrudate swell of organobentonite-filled polypropylene nanocomposites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Melt rheological properties and extrudate swell of organobentonite-filled polypropylene nanocomposites were studied by using a capillary rheometer in a shear rate range of 50-8000 sâ1 and a temperature range of 190-210 °C. The nanocomposites exhibited shear-thinning behavior and the viscosity was well-described by the power law in this shear rate region. The addition of organobentonite enhanced the pseudoplasticity, i.e. increased the shear thinning behavior. With increasing organobentonite concentration, the shear stress/viscosity increased, while the power law index (n) decreased, and this effect is more significant at higher filler concentrations (>3 wt%). The dependence of shear viscosity on temperature obeyed the Arrhenius-Eyring expression, and the activation energy (Ea) decreased with increasing shear rate. Extrudate swell is a non-linear function of shear rate, while it is a linear function of shear stress or temperature. With increasing organobentonite concentration (>3 wt%), the extrudate swell clearly decreased, which is attributed to the limitation of the elastic recovery of the polymer chains by oriented silicate layers.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 27, Issue 4, June 2008, Pages 470-479
Journal: Polymer Testing - Volume 27, Issue 4, June 2008, Pages 470-479
نویسندگان
Nattaya Muksing, Manit Nithitanakul, Brian P. Grady, Rathanawan Magaraphan,