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Gas permeability and mechanical properties of polystyrene–polypropylene blends

✍ Scribed by Zdeněk Horák; Jan Kolařík; Milan Šípek; Vladimír Hynek; Frantiśek Večerka

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
383 KB
Volume
69
Category
Article
ISSN
0021-8995

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✦ Synopsis

Permeability to water vapor and oxygen, elastic modulus, tensile strength, and impact strength of polystyrene-polypropylene and high-impact polystyrenepolypropylene blends were determined as functions of blend composition and morphology. Three types of styrene-butadiene block copolymers were tested as compatibilizers and found to improve mechanical properties of blends. The experimental data on permeability and modulus were compared with the predictions for the studied binary and ternary blends. The predictive scheme employs a two-parameter equivalent box model and the data on phase continuity of constituents calculated using general equations derived from percolation theory. Blends with decreased permeability and plausible mechanical properties were proposed with regard to intended applications in food packaging.

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