Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 82, Issue 9, Pages 2113-2127Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/app.2057
Keywords
polymer blends; EPR; PP; molecular weight; rheology; viscoelasticity; Tsenoglou model
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The rheological behavior of polypropylene, PP, ethylene-propylene copolymer, EPR, and EPR/PP blends was studied. Zero-shear viscosity and elastic relaxation time were determined by least-squares fits by using a Carreau-Yasuda model with Arrhenius temperature dependency. The effect of PP and EPR molecular weight, ethylene ratio in EPR copolymer (E/EPR), and EPR concentration on the zero-shear viscosity and elasticity of EPR/PP blends was determined experimentally. Molecular weight effects are compared to theoretically expected relationships. EPR concentration effect and E/EPR ratio effects agree well with predictions made by using the Tsenoglou model. (C) 2001 John Wiley & Sons, Inc.
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