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Article

Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties

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Research Center for Applied Science and Technology (RECAST), Tribhuvan University, P. O. Box 1030, Kirtipur, Kathmandu 44613, Nepal
2
Nepal Polymer Institute (NPI), P. O. Box 24411, Kathmandu 44613, Nepal
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Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden, Germany
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Institut für Textilmaschinen und Textile Hochleistungswerkstofftechnik, Technische Universität Dresden, 01069 Dresden, Germany
*
Author to whom correspondence should be addressed.
Polymers 2021, 13(1), 96; https://doi.org/10.3390/polym13010096
Received: 5 December 2020 / Revised: 24 December 2020 / Accepted: 24 December 2020 / Published: 29 December 2020
(This article belongs to the Section Polymer Processing and Engineering)
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. View Full-Text
Keywords: star block copolymer; epoxidation; morphology; mechanical properties; nanostructures star block copolymer; epoxidation; morphology; mechanical properties; nanostructures
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MDPI and ACS Style

Khatiwada, S.P.; Staudinger, U.; Jehnichen, D.; Heinrich, G.; Adhikari, R. Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties. Polymers 2021, 13, 96. https://doi.org/10.3390/polym13010096

AMA Style

Khatiwada SP, Staudinger U, Jehnichen D, Heinrich G, Adhikari R. Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties. Polymers. 2021; 13(1):96. https://doi.org/10.3390/polym13010096

Chicago/Turabian Style

Khatiwada, Shankar P., Ulrike Staudinger, Dieter Jehnichen, Gert Heinrich, and Rameshwar Adhikari. 2021. "Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties" Polymers 13, no. 1: 96. https://doi.org/10.3390/polym13010096

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