Experimental study demonstrates durable remolding in vitrimeric silicone elastomers via Meldrum's acid cross-links, suggesting broader pathways for recyclable materials.
Current vitrimer technology uses only a handful of distinct reactions for cross-linking. New dynamic reactions can diversify vitrimer functionality and properties. In this paper, reversible cross-links formed by conjugate addition–elimination of thiols with a Meldrum’s acid derivative enable compression–remolding of silicone elastomers. After 10 remolding cycles, there is no discernible deterioration of mechanical properties (Young’s modulus, T g, rubbery plateau E’ ), nor is there a change in stress relaxation activation energy. This robust new cross-linker could be implemented in any number of systems that currently use permanent thiol–ene cross-linking, expanding the scope of recyclable materials.
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Ishibashi et al. (2018) studied this question.
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