长脂肪链改性HMPP型大分子光引发剂的制备及性能研究

摘要

利用异佛尔酮二异氰酸酯(IPDI)与2-羟基-2-甲基-1-[4-(2-羟基乙氧基)苯基]-1-丙酮(JRCure-1113)、十八胺及十八醇的反应制备了2种长脂肪链改性的HMPP(2-羟基-2-甲基-1-苯基-1-丙酮)型光引发剂(2959-IPDI-Am和2959-IPDI-Al).利用红外光谱、核磁共振氢谱以及紫外-可见光谱表征了其结构,研究了光引发剂的紫外光裂解过程以及其引发1,6-己二醇二丙烯酸酯(HDDA)聚合的动力学.结果表明:与JRCure-1113相比,2959-IPDI-Am和2959-IPDI-Al具有较高的光引发活性,能在一定程度上降低氧阻聚.此外,2959-IPDI-Am和2959-IPDI-Al引发HDDA光固化所得固化膜的凝胶率分别为96.0％和95.9％,残留光引发剂的可萃取率降为10％.2959-IPDI-Am和2959-IPDI-Al与2-羟基-2-甲基-1-苯基-1-丙酮(JRCure-1103)复配使用具有良好的光引发性能.%Two long alkyl chain modified HMPP-type macrophotoinitiators (2959-IPDI-Am and 2959-IPDI-Al) had been synthesized through the reaction of octadecylamine or octadecanol with terminated isocyanate which obtained by the reaction of isophorone diisocyanate (IPDI) with JRCure-1113.The structures were characterized by FT-IR,1H NMR and UV-vis spectroscopy.The photo bleaching of 2959-IPDI-Am and 2959-IPDI-Al were analyzed by UV-vis spectroscopy.The photopolymerization kinetics of HDDA initiated by 2959-IPDI-Am and 2959-IPDI-Al were explored by real-time FT-IR.The results revealed that the photoinitiating activity of 2959-IPDI-Am and 2959-IPDI-Al were higher than that of JRCure-1113 due to the migration of long alkyl chain modified photoinitiators,and the oxygen inhibition weaken to a certain degree.In addition,the gel rates of cured films initiated by 2959-IPDI-Am and 2959-IPDI-Al were 96.0％ and 95.9％,respectively.The extractable rates of the residual 2959-IPDI-Am and 2959-IPDI-Al were about 10％.The combination of 2959-IPDI-Am or 2959-IPDI-Al with JRCure-1103 has a better photoinitiating performance.