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Influence of Domain Size on Toughness of Poly(styrene‐block‐butadiene) Star Block Copolymer/Polystyrene Blends
Authors:Ralf Lach  Roland Weidisch  Andreas Janke  Konrad Knoll
Abstract:Summary: The toughness of poly(styrene‐block‐butadiene) star block copolymer/polystyrene (PS) blends have been investigated using the essential‐work‐of‐fracture approach. The blends show a co‐continuous or layer‐like structure of polystyrene‐rich and polybutadiene‐rich domains arising from the used extrusion process. A tough‐to‐brittle transition at a critical domain size of polystyrene‐rich domains of about 50 nm and a maximum in the non‐essential work of fracture at 20–30% PS (co‐continuous morphology) have been found.

Non‐essential work of fracture as a function of the mean thickness of polystyrene‐rich domains, demonstrating a tough‐to‐brittle transition at a critical domain thickness about 50 nm. AFM micrograph of a star block copolymer/PS‐blend containing 40% PS.

Keywords:amorphous star block copolymer  blends  microstructure  polystyrene  toughness
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