Deformation behaviour of styrene/butadiene star block copolymer/hPS blends: influence of morphology |
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Authors: | Rameshwar Adhikari Goerg H. Michler Reinhold Godehardt Elena M. Ivan''kova |
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Affiliation: | Institute of Materials Science, Martin Luther University Halle-Wittenberg, D-06099 Halle/Saale, Germany |
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Abstract: | The influence of morphology on micromechanical deformation behaviour of blends consisting of a lamellar forming styrene/butadiene star block copolymer and polystyrene homopolymer (hPS) was studied by transmission electron microscopy (TEM). The pure star block copolymer and the microphase separated blends revealing lamellar structure with polystyrene (PS) lamella thickness in the range of about 20 nm showed homogeneous plastic deformation of the PS lamellae. The macrophase separated blends with PS particles in lamellar matrix exhibited debonding at the particle–matrix interface associated with extensive plastic deformation of the surrounding matrix. The blends containing PS matrix deformed via crazing. |
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Keywords: | Styrene/butadiene block copolymer Morphology Micromechanical mechanism |
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