含氧光敏引发体系的研究——Ⅶ.二苯酮羧酸胺盐的光谱性质和光引发作用

本文合成了一类新的二苯酮羧酸胺盐(BPAA),包括具有不同碳链长度的伯胺盐和叔胺盐二个系列共六种化合物。实验结果表明,BPAA和二苯酮(BP)的光物理性质相似,长碳链BPAA分子具有显著的两亲性质,在非水溶液中可发生分子缔合形成反胶束。由BPAA与叔胺(TEA)组成的体系,引发MMA光聚合反应,聚合速度(R_p)比单用BP快得多,其中BPAA叔胺盐比相应的伯胺盐活性高,长链BPAA比短链BPAA活性高。另外还对比了氧气和氮气条件下的聚合反应速度,氧存在时R_p可增加二倍以上。此外还研究了BPAA/TEA浓度对聚合反应的影响。

STUDY OF PHOTOSENSITIZED INITIATION SYSTEM CONTAINING OXYGEN Ⅶ. SPECTRAL CHARACTERISTICS AND PHOTOINITIATIONS OF ALKYLAMMONIUM BENZOYLBENZOATE

A new kind of alkylammonium benzoylbenzoate (BPAA), including primary and tertiary amines with different length of hydrocarbon chain, was synthesized in this paper.The experimental results show that photophysical properties of alkylammonium benzoylbenzoate (BPAA) are identical with simple benzophenone, these BPAA with long hydrocarbon chain are characteristic of amphiphilic property and can aggregate into reversed micelles in non aqueous solution. The results obtained indicate that polymerization rates (Rp) of MMA initiated by BPAA/TEA are greatly faster than that initiated by simple BP/TEA at the same concentration condition in which tertiary amine salts of BPAA show higher activities related with the corresponding primary amine salts, polymerization rates for BPAA compounds with long-chain are remarkably higher than those with short chain. By comparison of the polymerization rates obtained under O2 and N2 different conditions, it shows that rate enhancement by O2 for BPAA leads to increase obviously in the rate above two times higher than that for BP. The influence of concentration of each BPAA/TEA photoinitiation system is also performed.