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Three-phase model of two-component blends consisting of a polystyrene-polybutadiene star block copolymer and a polystyrene homopolymer

: Lach, R.; Satapathy, B.K.; Weidisch, R.; Grellmann, W.; Knoll, K.


Macromolecular symposia 373 (2017), No.1, Art. 1600158
ISSN: 0258-0322
ISSN: 1022-1360
Journal Article
Fraunhofer IMWS ()

Based on results of atomic force microscopy and dynamic mechanical analysis applied on binary blends of polystyrene (PS)–poly­butadiene (PB) star block copolymers (ST3) having different compositions, a three-phase morphology that comprises PB-rich, PS/PB-mixed and PS-rich phase has been found. The pronounced enhancement of toughness in blends with 20–30 wt.-% PS homopolymer compared to pure ST3 can be understood by improvement of the stress transfer between the microdomains through the additional hPS-induced interfacial PS/PB-mixed volume fraction and the co-continuous morphology.