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

doi:10.7517/j.issn.1674-0475.1993.02.22

Abstract

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(k_b) 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

Li JUN, LI MIAO-ZHEN, CHANG ZHI-YING, WANG ER-JIAN. 4-(4’-DIMETHYLAMINOSTYRYL)-BENZOPHENONE/ DIPHENYLIODNIUM SALT--A NEW KIND OF ELECTRON TRANSFER PHOTOSENSITIZATION SYSTEM FOR RADICAL PHOTOPOLYMERIZATION[J]. Imaging Science and Photochemistry, 1993, 11(2): 22-29.

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

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