N，N－二甲基对甲苯胺引发N－对甲苯基马来酰亚胺光聚合的引发机理

Ｎ，Ｎ－二甲基对甲苯胺引发Ｎ－对甲苯基马来酰亚胺光聚合的引发机理叶克强，董建华，丘坤元，冯新德（北京大学化学系，北京，１００８７１）关键词光引发聚合机理，电荷转移复合物，激基复合物，荧光淬灭，Ｎ，Ｎ－二甲基对甲苯胺，Ｎ－对甲苯基马来酰亚胺Ｎ，Ｎ－二甲...

INITIATION MECHANISM OF PHOTO-INDUCED POLYMERIZATION OF N-4-METHYLPHENYL MALEIMIDE INITIATED BY N, N-DIMETHYL- P-TOLUIDINE

The initiation mechanism of photopolymerization has been studied by means of UV spectroscopy, fluorescence spectroscopy and end group analysis methods.UV spectroscopy measurements revealed the formation of charge transfer complexes (CTC ) between N - 4- methylphenyl maleimide (PMPMI ) and N,N - dimethyl - p - toluidine (DMT ). The equilibrium constant of the CTC determined from Benest - Hildebrand equation was 0.056. The fluorescence spedroscopy experimental results identified the formation of exciplex of PMPMI and DMT.The UV measurements of polymer confirmed the presence of DMT moieties as end groups in resulting polymers. Based on the experimental results, it is proposed that the initiation mechanism of photopolymerization of PMPMI initiated by DMT was via exciplex either by the excitation of CTC formed in the ground state or through the local excitation pathway.