Hghly self-healable crosslinked polyurethane-urea film with excellent long-term storage stability
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A self-healable crosslinked polyurethane-urea film is prepared upon heating a blended solution coated on a substrate where the blended solution consists of polyols, linear urea oligomers with isocyanate groups at both ends, and crosslinkers containing multiple isocyanate groups. Interestingly, the crosslinked polyurethane-urea film shows better self-healing properties than the polyurethane film only, which is attributed to the strong supramolecular networks resulting from the intermolecular interactions between urethane groups and urea groups. Fourier-transform infrared spectroscopy is applied to prove the effective self-healing mechanism of crosslinked polyurethane-urea film. In addition, contrary to the traditional one-pot synthesis to prepare crosslinked polyurethane-urea systems, the blended solution in our system has excellent long-term storage stability at room temperature.