两种裂解型有机硅大分子光引发剂的合成与性能

Synthesis and property of two polysiloxane-based macromolecular photoinitiators

以2-羟基-2-甲基-对羟乙基醚基苯基丙酮-1(2959)和氨基硅油为原料合成了双官能度和四官能度两种裂解型有机硅大分子光引发剂NH2-2959-2和NH2-2959-4。研究了两种光引发剂的紫外吸收和降解,引发光聚合及自上浮性能。结果表明,两种光引发剂均在275 nm有最大吸收峰,紫外吸收峰强度随着紫外光辐照时间的延长逐渐减弱。NH2-2959-4光引发剂体系的光聚合速率明显高于NH2-2959-2体系。与小分子光引发剂2959相比,NH2-2959-2和NH2-2959-4均具有较好的自上浮能力,可以在体系中自发地向表面迁移,形成浓度的梯度分布。

Two photocleavage polysiloxane-based macromolecular photoinitiators, NH2-2959-2 and NH2-2959-4, were synthesized with 2-hydroxy-4＇-（2-hydroxyethoxy）-2-methyl-propiophe （2959） and amino polysiloxane as raw materials. The properties of UV/vis absorption and degradation, photopolymerizetion and self-floating ability of the photoinitiaors were investigated. The results show that both of the photoinitaitors have a similar maximum absorption peak at 275 nm, and the intensity of the UV/vis absorption peak tended to decrease against the increase of the UV ir- radiation time. The system containing NH2-2959-4 exhibited a higher photopolymerization rate than that of NH2-2959-2. Compared with 2959, the NH2-2959-2 and NH2-2959-4 both possessed good self-floating ability, and could spontaneously migrate to the surface of the system to form a concentration gradient.