Study on interfacial connecting properties of small molecule intervention repairable epoxy composites

The interfacial bonding method and mechanical properties of new repairable epoxy and its composites were studied. Ethylene glycol was used to connect the resin interface. The effects of temperature, time and resin content on the strength of interface bonding were systematically studied, and the optimal bonding scheme was determined. The results show that this connection method has significant advantages, and the tensile strength reaches 73% of the intact resin. Furthermore, the reparable resin matrix fiber-reinforced composite was prepared, and this method was successfully extended to the composite connecting. The interfacial shear strength of the fiber composites reached 21.88 MPa by single lap test, which has a good application prospect.