Properties of fiberglass composite using epoxy vitrimer matrix cured by a novel bio-based imine curing agent
In view of the serious problem of recycling and insolubility of thermosetting resin matrix composites in automobile manufacturing,a curing agent containing dynamic imine bond was synthesized by using biovanillin and 4,4-diamino-phenylsulfone.It was further used to cure epoxy resins into a vitreous matrix for fiberglass composite that could be reprocessed and recycled.The composite shows excellent mechanical properties,with a tensile strength and modulus of 670 MPa and 29 GPa,flexural strength and modulus of 752 MPa and 27 GPa,and shear strength of 55 MPa,which are comparable to the commercial battery pack composite material such as BAC 449.This new vitrimer-based composite has better mechanical properties,and its flame retardant can reach UL-94 V-0 level.In addition,owing to the nature of dynamic imine bonds,this vitrimer-based composite can be chemically degraded so that the fiber and resin in the composite can be recycled and reused,helping with carbon reduction and environmental protection.It has potential application in the manufacturing of composite covers of battery packs for electric vehicles.
vitreous compositesbio-based and recyclabledynamic bond exchangeimine hardenerepoxy resin