Polyhydroxyurethanes from Biobased Monomers and CO2: A Bridge between Sustainable Chemistry and CO2 Utilization†

Comprehensive Summary Polyhydroxyurethanes (PHUs) have received considerable attention in the last decade as potential alternatives to traditional phosgene‐based polyurethanes (PUs). The development of suitable 5CC (five membered‐ring cyclic carbonate) precursors bearing multiple carbonate moieties (multi‐5CCs) is a key requisite for preparing PHUs by polyaddition reaction with bis‐ or polyamines. Producing sustainable PHUs from CO 2 ‐based five‐membered cyclic carbonates (5CCs) obtained from biobased epoxides is a valuable strategy to bridge CO 2 utilization and the upcycling of renewable substrates. In this context, while many multi‐5CC monomers reported in the literature are oil‐based, recent efforts have led to the development of a large variety of multifunctional 5CCs that are produced by the combination of CO 2 and renewable resources such as fatty acids and vegetable oils, lignin, terpenes, and sugars. In this work, recent crucial advances (2019—2023) on PHUs prepared from bis‐ and multi‐5CCs produced from CO 2 and (partially/potentially) biobased substrates are reviewed with respect to their synthesis, thermal and mechanical properties, and their recent, emerging applications.