Modular system for the production of degradable and recyclable thermosets via photopolymerization

Stanford researchers in the Bao Lab have developed a flexible and modular system for the production of degradable and recyclable thermosets via photopolymerization and 3D printing of hemiacetal ester-based resins. This approach centers on a polyurethane structure known for its strong, elastic, and adjustable features. The system also incorporates methacrylate at the ends of the chains for the polymerization process and integrates hemiacetal ester (HAE) connections. These HAE connections not only bind the polyurethane and methacrylate parts but also make it easy to degrade the material with a mild acid. A significant advantage of this method is that the resulting polymer can be easily purified (through a base-driven process to remove the polymethacrylic acid side product) to recover a functional polyurethane diol, making the material not just degradable but also recyclable.

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Image credit - DOI:10.1039/D3SC03623E

Stage of Development