CO2-based environment-friendly flexible UV light curing polyurethane acrylate

A series of CO₂-based UV cured polyurethane acrylate with good flexibility and mechanical strength were prepared using polycarbonate diol (PECD), diphenylmethane diisocyanate (MDI), hydroxyethyl acrylate (HEA), and tetrahydrofuran acrylate (THFA) as raw materials. Simultaneously compared with traditional polyester (PCLD)-based and polyether (PPG)-based UV cured polyurethane acrylates. By analyzing the infrared spectra of prepolymer and PECD-PUA, the generation of characteristic absorption peaks indicates the successful synthesis of PECD-PUA. In addition, compared with the uncured film, the carbon carbon double bond absorption peak (810 cm^-1) of the cured film disappeared, indicating that the double bond had undergone a reaction. The mechanical properties, hardness, water contact angle, and solvent absorption properties of UV-cured polyurethane were studied. The results show that the CO₂-based material PECD has excellent properties, the tensile strength can reach 9.83 MPa, and the elongation of break reach 82.92% and the cured UV-PECD-PU film has high hardness (pencil hardness: HB) All cured films exhibited excellent thermal stability (more than 250 ℃) through TGA analysis. This paper synthesized environmentally friendly CO₂-based photopolymerization polyurethane, providing direction for the resource utilization of carbon dioxide-based materials.