长波长光敏引发聚合体系

香豆素酮染料;双咪唑;染料增感;长波长光敏引发聚合体系     

Photolysis of hexaarylbiimidazole sensitized by dyes and application in photopolymerization

Kinetic studies on the near-UV photo-initiating polymerization of methylmethacrylate (MMA) sensitized by dye/hexaarylbi-imidazole systems were carried out. When exposed to high-pressure mercury lamp (filtered by Pyrex glass), dye/hex-aarylbiimidazole system undergoes quick electron transfer and free radicals are produced. RSH, as hydrogen donor, can improve the polymerization efficiency of MMA. Comparisons of influence of different dyes and different RSH on the conversion of MMA photopolymerization were carried out. Excellent results have been obtained in photoimaging studies, e.g. a minimum exposure energy of the photosensitive systems of 8 mJ/cm2 can be reached and the resolution of presensitized printing plate was ca. 10 μm.     

双咪唑光敏体系紫外光引发聚合甲基丙烯酸甲酯动力学和应用研究

用光敏剂4,4′ 二(N,N′ 二甲基-氨基)苯甲酮(简称米氏酮,MK)、引发剂邻氯代六芳基双咪唑(o-Cl-HABI)和氢给体助引发剂十二烷基硫醇(SH)组成光敏引发体系。研究了在高压汞灯照射下,甲基丙烯酸甲酯(MMA)光聚合速率和该敏化体系每一个组分,包括MK、o-Cl-HABI、SH和MMA的关系,还研究了该体系在PS版材上的应用,并获得了很好的效果。