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A glycidyl‐terminated polyurethane prepolymer was synthesized and used to enhance the properties of epoxy resins. Some properties of glycidyl‐terminated PU/epoxy with polyether based (PPG) and polyester based (PBA) glycidyl‐terminated PU were investigated in this research. The polyether based glycidyl‐terminated PU(PPG) modified epoxy resin proved to be superior to conventional epoxy resins in improved impact strength and fracture energy, but not tensile strength, tensile modulus, flexural strength and flexural modulus. On the other hand, the polyester based glycidyl‐terminated PU(PBA) modified epoxy resin had increased mechanical properties while showing slight variation of impact strength and fracture energy. Different mechanisms for this behaviour are advanced in this paper.
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Li et al. (1994) studied this question.
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