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Thermoset polymers with permanently cross-linked networks via thermally reversible covalent bonds have outstanding self-healing and adaptable properties, combined with very good mechanical properties and solvent resistance. This work reports in premiere the synthesis and characterization of such materials, derived from epoxidized linseed or soybean oils crosslinked with different ratios of 2, 2’- dithiodibenzoic acid. The epoxy/hardener ratio was studied as a key parameter influencing the overall process and moreover the networks recyclability. The synthesized thermosets showed excellent chemical recycling and mechanical reprocessing abilities. The elaborated networks were chemically recycled then the recuperated reprocessed material showed no or a small decrease in mechanical properties. These biobased thermosets open opportunities on the circular use of thermosets.

materials advances

Building thermally and chemically reversible covalent bonds in vegetable oil based epoxy thermosets. Influence of epoxy–hardener ratio in promoting recyclability