影像科学与光化学 ›› 1993, Vol. 11 ›› Issue (2): 22-29.DOI: 10.7517/j.issn.1674-0475.1993.02.22

• 研究论文 • 上一篇    下一篇

4-(4′-二甲胺基苯乙烯基)-二苯酮/二苯基碘鎓盐——一种新的电子转移光敏化聚合引发体系

李军, 李妙贞, 常志英, 王尔鑑   

  1. 中国科学院感光化学研究所, 北京 100101
  • 收稿日期:1992-04-20 修回日期:1992-07-03 出版日期:1993-05-20 发布日期:1993-05-20
  • 通讯作者: 常志英

4-(4’-DIMETHYLAMINOSTYRYL)-BENZOPHENONE/ DIPHENYLIODNIUM SALT--A NEW KIND OF ELECTRON TRANSFER PHOTOSENSITIZATION SYSTEM FOR RADICAL PHOTOPOLYMERIZATION

Li JUN, LI MIAO-ZHEN, CHANG ZHI-YING, WANG ER-JIAN   

  1. Institute of Photographic Chemistry, Academia Sinica, Beijing 100101, P.R. China
  • Received:1992-04-20 Revised:1992-07-03 Online:1993-05-20 Published:1993-05-20

摘要: 一种新的光敏剂,4-(4′-二甲胺基苯乙烯基)-二苯酮(MABP),已经合成并作了光谱特性表征,MABP和二苯基碘鎓盐(DPIO)组成的体系在近紫外和可见光区具有良好的光响应性,MABP和DPIO体系的光解反应通过电子转移过程快速发生,同时产生MABP的光褪色反应和DPIO的裂解反应,生成具有引发作用的苯自由基,MABP的光褪色速度常数测定为30.7(mol-1·L·s-1),甲基丙烯酸甲酯(MMA)的光聚合反应在氮气净化的乙腈溶液中进行,得到的动力学数据表明,聚合速度和MABP,DPIO和MMA的浓度成正比,浓度指数值分别为0.46,0.32和1.0,添加巯基化合物显著地加速聚合反应,光引发机理也作了讨论。

关键词: 4-(4′-二甲胺基苯乙烯基)-二苯酮, 光敏聚合, 电子转移, 二苯基碘鎓盐

Abstract: A new photosensitizer, 4-(4’-dimethylaminostyryl)-benzophenone (MABP) has been synthesized and characterized spectrophotometrically. The MABP and diphenyliodonium salt(DPIO) combination system shows a good photoresponse at near UV and visible light regions. The photolysis of MABP/DPIO system occurs rapidly via electron transfer and leads simultaneously photo bleaching of MABP and cleavage of DPIO to generate phenyl radical. The photobleaching rate constant(kb) determined was 30.7(mol-1·L·s-1). The photopolymerization of MMA was carried out in N2 purged acetonitrile solution. The kinet-ical results obtained show that the polymerization rate is proportional to the concentration with exponents of 0.46, 0.32, and 1.0 for DPIO, MABP and MMA respectively. The considerable rate acceleration was obtained by adding thiol compounds. The photoinitiation mechanism was also discussed.

Key words: 4-(4’-dimethylaminostyryl)-benzophenone, photosensitized polymerization, electron transfer, diphenyliodonium salt