Recyclable Vitrimers from Carbohydrate-Based Diols for Epoxy Resins Applications

The transition towards bio-based, recyclable thermoset-like materials is a key strategy to reduce the environmental footprint of plastics. Covalent Adaptable Networks (CANs) enable the replacement of conventional thermoset epoxy resins by combining high performance with recyclability. Here, we present the synthesis of an innovative bio-based epoxy CAN based on diglycidyl ether of xylose glyoxylate diol (DGEXO) and the evaluation of its curing behaviour, properties and recyclability. The final results exhibit a robust crosslinked network, characterized by a glass transition temperature of ~120 °C, a 5% weight-loss degradation temperature above 280 °C and excellent mechanical and electrical performance. Chemical recyclability was demonstrated through base-catalysed alcoholysis, yielding 71% of the open ring hardener (MHHDP) and 72% of the polyol fraction, evidencing an open-loop route to valorize the initial precursors. Application-oriented tests further indicated promising performance for printed circuit board substrates and adhesive formulations. These results confirm the potential of the DGEXO-CAN epoxy resin developed in this work as a potential alternative to conventional systems, capable of reducing environmental impact whilst maintaining high-performance properties.