科研之友
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摘要
An epoxy resin modified thermo-reversible polyurethane with self-healing ability was manufactured successfully by introducing E51 epoxy resin into Diels-Alder reaction-based thermo-reversible polyurethane. The tensile strength, Young's modulus, impact toughness and Shore hardness of the ther-mo-reversible polyurethane were significantly enhanced, while the elongation at break of which was remained at a relatively high level after epoxy resin was introduced. The 20% epoxy resin-modified thermo-reversible polyurethane material presents high mechanical properties such as strength, toughness and hardness, as well as excellent self-healing characteristic. If damages such as cracks and crevices have been accidently emerged on the epoxy resin modified thermal reversible polyurethane, such damaged spots can be recovered through a post heat treatment by either 130℃×20 min or 60℃×24 h. Moreover, such repair may be allowed to repeat several times for the same location after being subjected to repeatedly damages. It is believed that the enhancement of mechanical performance of the epoxy resin modified thermal reversible polyurethane may be ascribed to the so called forced mutual dissolution and synergistic effect , resulted from the interpenetrating polymer network structure formed through entanglement of the rigid phase of epoxy and the elastic polyurethane phase of polyurethane. Meanwhile, the repeatable self-healing of the epoxy resin modified thermal reversible polyurethane may be due to the synergistic effect of the thermo-reversible Diels-Alder reaction and the thermal movement of molecular chains. ? 2023 Chinese Journal of Materials Research.
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