Rheological and thermal properties of binary blends of polypropylene and poly(ethylene-CO-1-octene)

• Published in: Journal of applied polymer science Vol. 79; no. 9; pp. 1634 - 1639
• Main Authors: Da Silva, Ana Lúcia N., Rocha, Marisa C. G., Coutinho, Fernanda M. B., Bretas, Rosário E. S., Scuracchio, Carlos
• Format: Journal Article
• Language: English
• Published: New York John Wiley & Sons, Inc 28.02.2001; Wiley
• Subjects: Applied sciences; blends; Exact sciences and technology; Organic polymers; Physicochemistry of polymers; poly(ethylene-co-1-octene); polypropylene; Properties and characterization; rheological properties; Rheology and viscoelasticity; thermal properties; Solid state; Polymer blends; Molten state; Olefin copolymer; Dynamic mechanical properties; Isotactic polymer; Propylene polymer; Ethylene copolymer; Experimental study; Rheological properties
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/1097-4628(20010228)79:9<1634::AID-APP130>3.0.CO;2-Y

Dynamic viscoelastic properties of binary blends consisting of an isotactic polypropylene (i‐PP) and ethylene‐1‐octene copolymer (PEE) were investigated to reveal the relation between miscibility in the molten state and the morphology in the solid state. In this study, PEE with 24 wt % of 1‐octene was employed. The PEE/PP blend with high PEE contents showed two separate glass‐relaxation processes associated with those of the pure components. These findings indicate that the blend presents a two‐phase morphology in the solid state as well as in the molten state. The PEE/PP blend with low PEE content showed a single glass‐relaxation process, indicating that PEE molecules were probably incorporated in the amorphous region of i‐PP in the solid state. The DMTA analysis showed that the blends with low PEE contents presented only one dispersion peak, indicating a certain degree of miscibility between the components of these blends. These results are in accordance with the results of the rheological analysis. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1634–1639, 2001