聚氨酯改性丙烯酸环氧单酯的光-热固化性能

Properties of UV-heat cured films of polyurethane-modified epoxy monoacrylates

合成了聚氨酯改性丙烯酸环氧单酯,树脂分子结构中同时具有光固化基团(双键)和热固化基团(环氧基团)。用FTIR表征了光-热固化过程特征吸收峰的变化。研究了不同的稀释剂、热固化剂对光固化和光-热混杂固化的凝胶率、吸水率、力学性能和热性能的影响,结果表明:光固化膜的凝胶率低于89%,而光-热混杂固化膜的凝胶率在97%左右。在相同稀释剂条件下,与丙烯酸环氧单酯光-热固化体系相比,聚氨酯改性丙烯酸环氧单酯光-热固化膜的断裂强度下降,而断裂伸长率由4.9%提高到8.0%。光-热固化膜的热分解温度都在230℃以上。

A new type of polyurethane-modified epoxy monoacrylates （PMEMA） was synthesized. The resins contained both UV-curable groups （C=C） and heat-curable groups （epoxy）. Different UV-curable liquid compositions were developed with different kinds of active diluents. The change of absorption peaks of double bond and epoxy group were identified by FTIR spectra during UV-heat curing process. The gel content, water absorption, mechanical and thermal characteritics of the UV cured films and UV-heat cured films were investigated. The gel contents of UV cured films were lower than 89%, and the gel contents of UV-heat cured films were about 97%. Compared to the epoxy monoacrylates （EMA） systems with same active diluents, the breaking strength of UV-heat cured films of PMEMA system decreased, but its relative elongation increased from 4.9% to 8.0%. The first decomposition temperature of UV-heat cured films was over 230℃.