Controlled-peroxide degradation of polypropylene: Rheological properties and prediction of MWD from rheological data

被引：59

作者：

Azizi, H. ^{[1
]}

Ghasemi, I. ^{[1
]}

Karrabi, Q. ^{[1
]}

机构：

[1] IPPI, Tehran, Iran

来源：

POLYMER TESTING | 2008年 / 27卷 / 05期

关键词：

polypropylene; rheology; degradation; molecular weight distribution; reactive extrusion;

D O I：

10.1016/j.polymertesting.2008.02.004

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 theological 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. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：548 / 554

页数：7

共 22 条

[1]

Azizi H, 2005, IRAN POLYM J, V14, P465

[2] Reactive extrusion of polypropylene: production of controlled-rheology polypropylene (CRPP) by peroxide-promoted degradation [J].