A Study of the Effect of Polyetheramines on the Mechanical Property of High Elasticity-high Elongation Epoxy Resin Adhesives

Epoxy resin structural adhesives modified by polyetheramine(D230,D400,T403)and polyetheramine(D2000) were prepared by casting molding method.A series of high elasticity-high elongation epoxy resin systems with simple formula design,were prepared and compared with epoxy systems modified by common aliphatic amine(593#) and Polyether glycol(HF220).The influence of the relative molecular mass,functional degree and structure of the polyetheramine on the tensile property,tensile behavior of the product was investigated by mensurating its tensile strength,breaking elongation,glass transition temperatrue(Tg) and the morphology of fractured surfaces.Load-displacement curves reflect the brittle fracture-toughness fracture-ductile fracture transition.Introduction of flexible D2000 into epoxy systems could dramatically reduce the degree of cross-linking,form relaxible network structure and facilitate the chain motion,thereby improving the ductibility.Furthermore,good synergistic effect between D400 and D2000,the CYD-128/D400/D2000 system have a higher elongation.Thermal analysis indicated that the glass transition temperature decreasesd with increasing D2000 content.Systems with D2000 have better flexibility-elasticity at low temperatures.SEM analysis of tensile fracture surfaces proved D2000 to be an excellent flexibilizer that modifies epoxy systems successfully to form a homogeneous phase structure.