Abstract
A green method is established to prepare soft self-healing cross-linked non-isocyanate polyurethanes (SH-NIPUs). Three non-isocyanate polyurethane prepolymers with furan terminal groups (F-NIPUs) were synthesized through a ring-opening reaction of diglycerol bis(cyclic carbonate) with isophoronediamine and furfurylamine under mild reaction conditions. New SH-NIPUs were prepared via a Diels–Alder reaction between F-NIPUs and unsaturated polyester. The obtained SH-NIPUs were characterized by 1H NMR, ATI-FTIR, DSC, polarized optical microscope, and tensile strength after being damaged and healed. The SH-NIPUs exhibited a Tg between -4 and 20 °C, and a relatively low reverse Diels–Alder temperature between 90 and 100 °C. Soft SH-NIPUs with high self-healing efficiency up to 100% were achieved successfully.
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