Journal
POLYMER TESTING
Volume 24, Issue 1, Pages 86-93Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2004.06.006
Keywords
polypropylene; rheological properties; statistical experimental design; degradation
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Polypropylene (PP) degradation during multiple extrusion at different temperatures was studied by following changes in rheological properties. Dynamic and transient experiments were carried out in a rheometer with parallel plate geometry. In addition, a statistical experimental design (2(2), with replicates) was employed using die zone temperature (X-1) and number of extrusion cycles (X-2) varying at two levels. The system degradation was modeled using melt flow index (MFI) as a control variable. A rapid increase of chain scissions of the PP macromolecules and, consequently, a molecular weight reduction, was observed through abrupt increase of MFI and reduction of properties such as complex viscosity (eta*) and elasticity of the molten polymer. (C) 2004 Elsevier Ltd. All rights reserved.
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