کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5207581 1382358 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Controlled-peroxide degradation of polypropylene: Rheological properties and prediction of MWD from rheological data
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Controlled-peroxide degradation of polypropylene: Rheological properties and prediction of MWD from rheological data
چکیده انگلیسی
In this study, some experimental results of the peroxide-degradation process of polypropylene (PP) in a co-rotating twin-screw extruder to produce controlled-rheology polypropylene (CRPP) are presented. The peroxide was dicumyl peroxide (DCP) and the concentration of DCP was in the range 0-0.6 wt%. It was found that the rheological properties of PP change significantly during reactive extrusion. Melt flow index (MFI) increased with DCP concentration. Complex viscosity decreases with increasing DCP concentration. Degraded resins showed more Newtonian behavior than the origin resin. Cole-Cole plots indicated that mean relaxation times of CRPP resins are shorter than for virgin PP, and the relaxation mechanism is more uniform for modified samples. From dynamic rheological data, molecular weight (MW) and molecular weight distribution (MWD) were calculated. Results indicated that MW decreases and MWD becomes narrower with increasing peroxide concentration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 27, Issue 5, August 2008, Pages 548-554
نویسندگان
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