新型二苯乙烯类光引发剂的光引发性能分析

Photoinitiativity analysis of novel distyryl photoinitiators

报道了3个新型近紫外光引发剂:4-甲氧基-4-苯甲酰基二苯乙烯,3,4-二甲氧基-4-苯甲酰基二苯乙烯,3,4,5-三甲氧基-4-苯甲酰基二苯乙烯。利用光照实验和光示差热扫描量热仪(Photo-DSC)对这些分子的光引发性能进行了系统研究,分析不同数目的甲氧基、光照时间以及光引发剂浓度对光引发性能的影响。结果表明:由Photo-DSC测得3种化合物的单体聚合速率分别为0.065 32,0.102 01,0.163 23s-1,表明随着随着甲氧基数目的增多,能有效地提高光引发剂的引发性能;随着光照时间的增长与引发剂浓度的增大,光聚合比率逐渐降低并趋于稳定。

4-benzoyl-4-methoxyldiphenylethylene,4-benzoyl-3,4-dimethoxyldiphenylethylene,and 4-benzoyl-3,4,5-Trimethoxyldiphenylethylene are studied as near-ultraviolet photoinitiators.Light trigger property is studied systematically via illumination experiment and Photo-DSC,and the influence of photoinitiativity is studied by different amount of methoxyl groups,illumination time and concentration of photoinitiator.The results show that the monomer polymerization rate of three compounds measured by the Photo-DSC are 0.065 32s-1,0.102 01s-1 and 0.163 23s^-1.Thus photoinitiation of photoinitiators can be effectively increased by increasing the number of attached methoxy groups.The ratio of photopolymerization yield between two photoinitiators gradually decreases with the increase of illumination time or concentration of photoinitiator,and it tends to be stable.