Organosilicon sulfides as co-initiators in photoinduced free radical polymerization

摘要

Three sulfur-containing silanes(organosilicon sulfides)were investigated as electron donors in photoinduced free radical polymerization,in conjunction with xanthene dye(5,7-diiodo-3-butoxy-6-fluorone,DIBF)as sensitizer.The results were compared with the nonsulfur-containing silane,N-((trimethylsilyl)methyl)aniline(K1)and thiophenoxyacetic acid(TPAA).The kinetic studies clearly showed that the DIBF-organosilicon sulfides exhibit a significant increase in the efficiency of free radical polymerization of TMPTA compared to nonsulfur-containing silane and that the efficiency of all tested electron donors is only slightly dependent on the structure of the sulfur-containing co-initiators.