Authors Khatiwada, S. P. ; Staudinger, U. ; Jehnichen, D. ; Heinrich, G. ; Adhikari, R.
Title Influence of controlled epoxidation of an asymmetric styrene/butadiene star block copolymer on structural and mechanical properties
Date 04.01.2021
Number 58224
Abstract 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.
Publisher Polymers
Citation Polymers 13 (2021) 96

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