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Aspects of dispersion and flow in thermoplastic-elastomer blends

โœ Scribed by H. P. Schreiber; A. Olguin

Publisher
Society for Plastic Engineers
Year
1983
Tongue
English
Weight
591 KB
Volume
23
Category
Article
ISSN
0032-3888

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โœฆ Synopsis

Abstract

Polypropylene, polystyrene, EP (ethylene/propylene) rubber, and bromobutyl rubber were blended under standardized conditions and the sizes of minor phase domains determined by Quantimet analysis. Dispersion effectiveness was found to depend on the melt viscosities of components under mixing conditions and on their โ€œcompatibiltyโ€ as inferred here from surfaceโ€tension data. Dispersion was optimized when components wet readily at contact surfaces and when melt viscosities were similar. Shear heating during dispersion appeared to offer an empirical index of component compatibilty. Apparent melt viscosities of the blends further reflected the component compatibility factor.

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