Hydrophobic and self-healing polyurethane elastomers(ISH-PU-X)were prepared by introducing quadruple hydrogen bonds and disulfide bonds onto the polyurethane chains.The effects of disulfide bonds and quadruple hydrogen bonds on the mechanical properties and self-healing performance of polyurethane elastomers were studied.It was found that the tensile strength of ISH-PU-2 was 4.49 MPa,the elongation at break was 331％,the scratch disappeared completely at 80 ℃,and the mechanical properties could be restored to 98％of the original sample.By utilizing the fluidity of dynamically bonded polymer chains,silver nanowires(AgNWs)were uniformly embedded on the surface of polyurethane to obtain hydrophobic self-healing polyurethane electromagnetic interference shielding composite materials(AgNWs/PU-X).The effects of AgNWs content on the electromagnetic interference shielding properties,hydrophobicity,and self-healing performance of the composites were explored.The results showed that the electromagnetic interference shielding effectiveness of AgNWs/PU-X could reach about 60 dB,the water contact angle could reach about 122°,and the conductivity could be restored to 85％of the original sample after healing at 80 ℃.The AgNWs/PU-X composite materials can expand the application fields of electromagnetic interference shielding materials and meet the sustainable demand in complex and diverse application environments.
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