Authors
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Staudinger, U. ; Satapathy, B.K. ; Thunga, M. ; Weidisch, R. ; Janke, A. ; Knoll, K.
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Title
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Enhancement of mechanical properties of triblock copolymers by random copolymer middle blocks
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Date
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21.09.2007
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Number
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15310
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Abstract
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Symmetric styrene-b-styrene-co-butadiene-b-styrene (S-SB-S) tri-block copolymers with varying middle and outer block composition have been studied. We report our findings based on a systematic variation of the effective interaction parameter (chi) by adjusting the composition of the random copolymer in the middle block and of the outer blocks (in terms of PS-chain length) which allows us to explore the chi-parameter space with regard to molecular architecture more thoroughly than in SBS triblock copolymers. A variation in the S/B middle block composition or in the PS outer block content leads to a change in phase behaviour and morphology simultaneously accompanied by significant changes in mechanical properties, varying from elastomeric to thermoplastic property profile. Despite high PS contents of 55-75 wt.% these S-SB-S triblock copolymers reveal high strain at break values between 650% and 350% which is in striking contrast to the conventional SBS triblock copolymers where only about 10% strain at break have been reported to be achieved with similar PS-content (similar to 75 wt.%). (c) 2007 Elsevier Ltd. All rights reserved.
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Publisher
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European Polymer Journal
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Wikidata
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Citation
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European Polymer Journal 43 (2007) 2750-2758
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DOI
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https://doi.org/10.1016/j.eurpolymj.2007.03.022
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