Relating microhardness to morphology in styrene/butadiene block copolymer/polystyrene blends |
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Authors: | FJ Baltá-Calleja ME Cagiao GH Michler |
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Affiliation: | a Instituto de Estructura de la Materia, CSIC, Serrano 119, 28006 Madrid, Spain b Department of Engineering, Institute of Materials Science, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle/Saale, Germany |
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Abstract: | The microhardness behaviour of binary blends comprising a styrene/butadiene star block copolymer and polystyrene homopolymer (hPS) over a wide composition range is investigated. In particular, the interrelation between the morphology, tensile properties (such as yield stress σY and the Young's modulus, E) and the microhardness H is explored. As in the case of microphase separated block copolymers and binary block copolymer blends, as reported in preceding publications, a clear deviation in the microhardness behaviour from the additivity law is observed. The lamellar block copolymer system is compared with the nanostructure of semicrystalline polymers having a lamellar morphology. A dependence of H upon PS lamellar thickness is found. For the samples with lamellar morphology the hardness value was found to correlate with the mechanical parameters obtained by uni-axial tensile testing according to: H/σY∼2.2 and E/H∼22. |
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Keywords: | Styrene/butadiene block copolymer/polystyrene blends Microhardness Electron microscopy |
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