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二芳基碘鎓盐和三芳基硫鎓盐是阳离子聚合的光引发剂和光敏产酸物,但他们在300nm以上的光吸收很低,限制了对紫外光的利用效率。为解决此问题,本文合成了一些新的碘鎓盐和硫鎓盐,并用凝胶时间方法考察了它们的光引发效率。实验结果表明,2-苯硫基甲基,2′,4′-二甲基二苯碘鎓盐和9-蒽丙基,二苯基硫鎓盐具有特别高的光引发效率,这归之于光照时这些鎓盐发生了分子内电荷转移反应,即发生了分子内敏化。9-蒽丙基二苯硫鎓盐分子中的蒽基(An)是电子给体也是敏化基团,光照时可发生如下反应:
Diaryliodonium salts and triarylsulfonium salts are cationic polymerization photoinitiators and photoacid generators, but their light absorption above 300 nm is very low, limiting the efficiency of UV light utilization. In order to solve this problem, some novel iodonium salts and sulfonium salts were synthesized and their photoinitiation efficiency was investigated by gel time method. The experimental results show that 2-phenylthiomethyl, 2 ’, 4’-dimethyldiphenyliodonium and 9-anthrylpropyl and diphenylsulfonium salts have a particularly high photoinitiation efficiency At light irradiation, these onium salts undergo intramolecular charge transfer reaction, that is, intramolecular sensitization occurs. Anthracene propyldiphenylsulfonium salt of the anthracene group (An) is an electron donor is also sensitized group, the following reactions can occur when illuminated: