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以钠缩合法合成的含Si–Cl键的超支化聚硅烷(Cl-HPS)为基础,将其分别与4-羟基二苯甲酮和2-羟基硫杂蒽酮反应,制备了小分子光引发剂取代的超支化聚硅烷BP-HPS和TX-HPS.小分子光引发剂取代的超支化聚硅烷可以不同程度地扩展超支化聚硅烷的紫外吸收.采用实时红外光谱研究了它们引发己二醇二丙烯酸酯(HDDA)紫外光聚合行为.结果表明,小分子光引发剂取代的超支化聚硅烷的自由基引发效率高于未经取代的超支化聚硅烷和它们对应的小分子光引发剂的引发效率.电子自旋共振光谱研究表明,BP-HPS和TX-HPS既可以裂解产生硅自由基,也可以通过硅甲基参与的夺氢反应产生碳中心自由基.
Based on the Si-Cl bond-containing hyperbranched polysilane (Cl-HPS) synthesized by the sodium condensation method, 4-hydroxybenzophenone and 2-hydroxy thioxanthone were reacted with each other to prepare small molecule light Initiator-substituted hyperbranched polysilanes BP-HPS and TX-HPS.The small molecular photoinitiator-substituted hyperbranched polysilanes can extend the UV absorption of hyperbranched polysilanes to varying degrees.We used real-time infrared spectroscopy (HDDA) .The results showed that the radical initiation efficiency of small molecule photoinitiator substituted hyperbranched polysilanes was higher than that of unsubstituted hyperbranched polysilanes and their corresponding small molecule photoinitiators The results of electron spin resonance spectroscopy show that both BP-HPS and TX-HPS can generate silicon free radicals by cleavage and can also generate carbon center radicals through the hydrogen abstraction reaction of silicon methyl groups.