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对于正性烯类单体,主要是乙烯基咔唑的电荷转移聚合,诚田已作过详细综述。负性烯类单体的电荷转移聚合主要研究的单体是丙烯腈(AN)及甲基丙烯酸甲酯(MMA)。Barton等研究了芳烃为引发剂的MMA光聚合。我们研究了芳胺为引发剂的光聚合。 芳胺,尤其是芳叔胺,是较强的电子给体,与负性单体在光照下经激基复合物而引发聚合,我们的实验表明,吡啶及其同系物(喹啉与吖啶)并不象吡咯及其同系物(吲哚与咔唑)那样有效地引发AN等负性单体的光聚合(见表1)。从图1所示的结构看,它们有
For the positive ethylenic monomers, mainly vinylcarbazole charge transfer polymerization, Cheng Tian has made a detailed review. The main studied monomers for charge-transfer polymerization of negative-ethylenic monomers are acrylonitrile (AN) and methylmethacrylate (MMA). Barton et al. Studied the aromatization of MMA as an initiator. We studied the photopolymerization of aromatic amines as initiators. Aromatic amines, especially aromatic tertiary amines, are strong electron donors, initiating polymerization with the negative monomer via an exciplex in the light. Our experiments show that pyridine and its homologues (quinoline and acridine ) Did not efficiently initiate photopolymerization of negative monomers such as AN (see Table 1) as did pyrrole and its homologues (indoles and carbazoles). From the structure shown in Figure 1, they have