Recycling Epoxy by Vitrimerization: Influence of an Initial Thermoset Chemical Structure

Yue, Liang; Amirkhosravi, Mehrad; Gong, Xuehui; Gray, Thomas G.; Manas-Zloczower, Ica

doi:10.1021/acssuschemeng.0c04815

Recycling Epoxy by Vitrimerization: Influence of an Initial Thermoset Chemical Structure

Journal Article · Mon Aug 03 00:00:00 EDT 2020 · ACS Sustainable Chemistry & Engineering

DOI:https://doi.org/10.1021/acssuschemeng.0c04815· OSTI ID:1644310

^[1]; ^[2]; Gong, Xuehui ^[2]; Gray, Thomas G. ^[2]; ^[2]

Case Western Reserve Univ., Cleveland, OH (United States); Case Western Reserve University
Case Western Reserve Univ., Cleveland, OH (United States)

Epoxy/anhydride cured thermosets are widely used in aerospace and wind energy structures. Recycling the enormous amounts of epoxy thermoset waste remains a global challenge. Vitrimerization, a practical, low-cost, eco-friendly and scalable method was developed for closed-loop recycling of the crosslinked epoxy by converting the permanent network into a vitrimer type dynamic network. Here we study the effect of virgin epoxy network properties on network reforming efficiency and the activation energy of the dynamic network by varying the epoxy/anhydride ratio. The results point out that the permanent network crosslink density and glass transition temperature have a more pronounced effect on vitrimerization efficiency by comparison with the concentration of free hydroxyl groups in the system. Furthermore, the result can be potentially used to better control vitrimerization efficiency in recycling epoxy thermoset polymers and tailor the vitrimerized products properties.

View Accepted Manuscript (DOE)

Research Organization:: Case Western Reserve Univ., Cleveland, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation

Grant/Contract Number:: SC0010714; SC0010714

OSTI ID:: 1644310

Journal Information:: ACS Sustainable Chemistry & Engineering, Journal Name: ACS Sustainable Chemistry & Engineering Journal Issue: 33 Vol. 8; ISSN 2168-0485

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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ball milling
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Recycling Epoxy by Vitrimerization: Influence of an Initial Thermoset Chemical Structure

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