Modification of epoxy resin with thermoplastic polyurethane elastomers: the effects of hard segments of the elastomers on properties of cured epoxy resin

摘要

The relationships between morphology and physical properties of cured epoxy resins blended with thermoplastic polyurethane elastomers (TPUs) were investigated. TPUs with hard segment/epoxy resin blends were prepared by a in-situ polymerization method in the epoxy resin. Adhesion properties of Fe/Fe joint using TPU/epoxy resin blends, bending properties and fracture toughness of cured ones were improved as compared with unblended epoxy resin and they were affected by the amount of TPUs and moreculer weights of macro-glycols. The results of dynamic viscoelastic properties, thermal analysis and scanning electron microscopy photographs of fracture surfaces of cured TPU/epoxy resin blends showed that the morphologies of the cured blends were varied by the amount of TPUs, moreculer weights of macro-glycols and the presence of hard seguments in TPUs.