摘要： 将三种双固化聚氨酯丙烯酸酯低聚物与环氧丙烯酸酯组成不同的双固化体系，利用实时红外(FT-IR)的 方法研究了不同固化顺序(先光固化后热固化和先热固化后光固化)对体系中—NCO反应基团和 C=C 双键转化率的 影响，结果显示先光固化后热固化的固化顺序更有利于体系达到高转化率。通过测试不同体系固化后的硬度和柔韧 性，证明后期的热固化能大幅度提高涂膜的硬度。

关键词: 双固化, 聚氨酯丙烯酸酯, 异氰酸酯基团, 实时红外

Abstract: The title dual- curing systems here prepared by three different polyurethane acrylates oli-gomers and epoxy acrylate，which can be cured by both heating and UV-iradiation.Both proces were mo-nitored quantitatively by infrared spectroscopy through the disapearance of the characteristic FT-IR bands at 2272cm^-1 (isocyanategroup) and 811cm-1(doublebond).Diferent curing sequences are shown to have greatly influence on the conversion of polymerization(C=C)and polyadition(—NCO/—OH).UV curing folowed by the heat curing is proved to have arelatively higher conversion.Mechanical properties of the curing film was evaluated ands hown to be highly dependent on the curingcondition.It was demonstrated that thermal curing after UV exposure was particularly efective to improve the hardness without any negative influence on flexibility.

Key words: dual- curing, isocyanates groups, polyurethane acrylate, FT-IR