Polyurethane-type polymeric photoinitiators containing side-chain thioxanthone and in-chain coinitia-tor amine were synthesized through step polymerization of isophorone diisocyanate(IPDI) , 2-(2 ,3-dihydroxy)prop-oxy-thioxanthone ( HPTX) and N-substituted diethanolamine. The thioxanthone and coinitiator amine structures were successfully introduced into the backbones of polymeric photoinitiators. FT-IR and 1H-NMR analyses confirmed the structures of polymeric photoinitiators. UV-Vis spectra showed the macromolecular chain had no obvious effect on the maximal absorption of thioxanthone moieties. Photopolymerization of polyurethane acrylate resin (PUA) , initiated by polyurethane-type polymeric thioxanthone photoinitiators, was studied through photo differential scanning calorimetry (photo-DSC). The results indicate that PU-IPTX is the most efficient photoinitiator for the photopolymerization of PUA.%通过异佛尔酮二异氰酸酯(IPDI)、2-(2,3-二羟基)丙氧基硫杂蒽酮(HPTX)及N取代的二乙醇胺进行逐步聚合反应,将硫杂蒽酮结构及共引发剂胺结构都引入到同一高分子链上,得到侧链含有硫杂蒽酮、主链含有共引发剂胺的聚氨酯型高分子光引发剂(PU-IBTX、PU-IMTX和PU-IPTX).傅立叶红外变换光谱和核磁共振氢谱证实了高分子光引发剂的结构.紫外光谱证实了高分子链的结构对硫杂蒽酮单元的最大紫外吸收几乎没有影响.用光致差示量热计研究聚氨酯型高分子光引发剂引发聚氨酯丙烯酸酯(PUA)树脂的光聚合反应,结果表明,PU-IPTX是引发PUA光聚合最有效的光引发剂.
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