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Dynamic mechanical properties of polystyrene–polyurethane blends
Author(s) -
Theocaris P. S.,
Kefalas V.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070421126
Subject(s) - polystyrene , polyurethane , materials science , thermoplastic polyurethane , composite material , rheology , miscibility , polymer blend , dynamic mechanical analysis , toughness , polymer , copolymer , elastomer
Four polystyrene–polyurethane mechanical blends were prepared with 5, 10, 20, and 40% thermoplastic polyurethane, respectively. Their impact properties were compared with pure polystyrene and commerical types of impact polystyrene. The rheological properties of the blends were studied with DSC and dynamic mechanical spectroscopy. It was found that addition of softer polyurethane conglomerates embedded inside the polystyrene matrix, although increasing the toughness of the blend as expected from addition of the softer particulate, also increased the glassy region of the blends by shifting their T g s to higher temperatures. A theory based on the interaction of phases was propounded explaining this phenomenon.