Authors
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Khatiwada, S. P. ; Staudinger, U. ; Jehnichen, D. ; Heinrich, G. ; Adhikari, R.
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Title
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Influence of controlled epoxidation of an asymmetric styrene/butadiene star block copolymer on structural and mechanical properties
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Date
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04.01.2021
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Number
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58224
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Abstract
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The chemical modification (namely the epoxidation) of a star shaped block copolymer (BCP) based on polystyrene (PS) and polybutadiene (PB) and its effect on structural and mechanical properties of the polymer were investigated. Epoxidation degrees of 37 mol%, 58 mol%, and 82 mol% were achieved by the reaction of the copolymer with meta-chloroperoxy benzoic acid (m-CPBA) under controlled conditions. The BCP structure was found to change from lamellae-like to mixed-type morphologies for intermediate epoxidation level while leading to quite ordered cylindrical structures for the higher level of chemical modification. As a consequence, the glass transition temperature (Tg) of the soft PB component of the BCP shifted towards significantly higher temperature. A clear increase in tensile modulus and tensile strength with a moderate decrease in elongation at break was observed. The epoxidized BCPs are suitable as reactive templates for the fabrication of nanostructured thermosetting resins.
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Publisher
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Polymers
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Wikidata
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Citation
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Polymers 13 (2021) 96
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DOI
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https://doi.org/10.3390/POLYM13010096
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Tags
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