Self-healing and chemical resistance polyurethane elastomers based on 2-ureido-4[1H]pyrimidinone

Self-healing polyurethane elastomers allow increasing the life cycle, adapting to the circular economy, thus reducing the generation of waste. In this work, ureido-4[1H]-pyrimidinone (UPy) compounds was used to construct on supramolecular polymer. The self-healing polyurethane elastomers were successfully prepared by supramolecular polymer based on UPy via a simple blending way. The self-healing performance of the polyurethane elastomers with UPy were investigated by the scratch test and the cut-off test, respectively. The scratch of the self-healing polyurethane elastomer (PU-15UPy) was totally healed in 1 h at 35 degrees C. The tensile strength and the elongation at break of PU-15UPy were 0.81 MPa and 563.8%. After the cut-off test, the healing efficiencies of tensile strength were 63.8% (0.51 MPa) and 85.2% (0.69 MPa) after healing for 10 h at 35 and 80 degrees C, respectively. The healing efficiency of tensile strength reached the value of 90.1% (0.73 MPa) after healing for 24 h at 80 degrees C. The chemical resistance of the self-healing polyurethane elastomers was tested by immersion in water, NaCl solution (3%), HCl solution (5%), NaOH solution (5%), and diesel, respectively. The mass loss of self-healing polyurethane elastomers were all less than 2% after immersed in these solutions for 1 month, indicating the excellent chemical resistance performance of PU-15UPy.