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℃。
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 abmrption 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 W-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 chred films exceeds 240
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2012年第3期38-40,45,共4页
Polymer Materials Science & Engineering
