Controlled-peroxide degradation of polypropylene: Rheological properties and prediction of MWD from rheological data
作者： H. Azizi , I. Ghasemi , M. Karrabi
DOI: 10.1016/J.POLYMERTESTING.2008.02.004
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摘要: Abstract In this study, some experimental results of the peroxide-degradation process polypropylene (PP) in a co-rotating twin-screw extruder to produce controlled-rheology (CRPP) are presented. The peroxide was dicumyl (DCP) and concentration DCP range 0–0.6 wt%. It found that rheological properties PP change significantly during reactive extrusion. Melt flow index (MFI) increased with concentration. Complex viscosity decreases increasing Degraded resins showed more Newtonian behavior than origin resin. Cole–Cole plots indicated mean relaxation times CRPP shorter for virgin PP, mechanism is uniform modified samples. From dynamic data, molecular weight (MW) distribution (MWD) were calculated. Results MW MWD becomes narrower
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