本文通过端异氰酸酯基聚氨酯预聚体与环氧树脂E-51形成了互穿网络,并通过热重分析仪(TGA)研究了完全固化后的互穿网络的热分解行为;透射电镜研究了IPN的相分离行为及用拉伸强度,断裂伸长率对其进行了力学性能的表征。结果表明,经过环氧树脂改性的聚氨酯的耐热性能比纯聚氨酯得到了提高,且力学性能也有所改善。并选取性能较好的PU/EP IPN,用纳米级有机蒙脱土对其进行了改性。研究发现,经有机纳米蒙脱土改性的PU/EP IPN的力学性能及耐热性有了进一步的提高。 In this paper, an interpenetrating network was formed by the reaction of the isocyanate-terminated polyurethane prepolymer with the epoxy resin E-51. The thermal decomposition behavior of the fully-cured interpenetrating network was investigated by thermogravimetric analysis (TGA) The behavior of phase separation and its mechanical properties were characterized by tensile strength and elongation at break. The results show that the epoxy resin modified polyurethane heat resistance than pure polyurethane has been improved, and the mechanical properties have also been improved. The PU / EP IPN with better performance was selected and modified with nano-scale montmorillonite. The results show that the mechanical properties and heat resistance of PU / EP IPN modified by organic nano-montmorillonite have been further improved.