【摘要】 合成了一系列同时具有光固化基团(双键)和热固化基团(环氧)的聚氨酯改性丙烯酸环氧单酯。用红外光谱(FT-IR)表征了固化过程特征吸收峰的变化,测试了柔性链段对聚氨酯改性丙烯酸环氧单酯光-热混杂固化膜的凝胶率、吸水率、力学性能、体积收缩率和热性能的影响。结果表明,在相同稀释剂条件下,与丙烯酸环氧单酯光-热固化膜相比,聚氨酯改性丙烯酸环氧单酯光-热固化膜的凝胶率可达97%以上,断裂强度有所下降,但断裂伸长率由4.6%提高到19.5%,体积收缩率由6.07%下降到4.22%,光-热固化膜的热分解温度超过了240℃。更多还原

【Abstract】 A series of polyurethane-modified epoxy monoacrylates(PMEMA) containing both UV-curable groups(C=C) and heat-curable groups(epoxy) were synthesized.The change of absorption peaks of double bond and epoxy group were identified by FT-IR spectra during UV-heat curing process.The gel content,water absorption,mechanical,volume shrinkage and thermal characterizations of the UV cured films and UV-heat cured films were measured.Compared to the epoxy monoacrylates(EMA) UV-heat curable systems with same active diluents,the gel contents of UV-heat cured films of PMEMA systems are also beyond 97%,and its breaking strength is decreased.Therefore,the relative elongation of UV-heat cured films of PMEMA is increased from 4.6% to 19.5%,and its volume shrinkage is decreased from 6.07% to 4.22%.The first decomposition temperature of UV-heat cured films exceeds 240 ℃.更多还原