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研究了二硫代苯甲酸酯存在下偶氮二异丁腈引发苯乙烯(St)、St与N-对羟基苯基马来酰亚胺(HPM)、St与N-对(2-氯/溴丙酰氧基)苯基马来酰亚胺(CPPM/BPPM)的可逆加成-断裂链转移(RAFT)均/共聚,聚合物的结构由紫外-可见光(UV-Vis)与凝胶渗透色谱(GPC)表征.结果表明,St的RAFT均聚以及St与N-取代马来酰亚胺的RAFT共聚均呈现活性聚合特征,分子量随着转化率上升而增加,且分子量分布较窄.对于St的RAFT均聚,由于双基终止,聚苯乙烯(PSt)链中“戴帽效率”随着转化率上升逐渐下降.对于St与N-取代马来酰亚胺的RAFT共聚合,电荷转移复合物的形成显著地提高了共聚反应速度,并促进交替结构的形成.随后进行了以P(St-alt-BPPM)引发St的原子转移自由基聚合以制备梳型PSt,结果表明在强极性溶剂中进行的聚合过程失去可控性,所得产物分子量极宽,而在本体聚合中所得聚合物分子量相对较窄,有一定的可控性.
The effects of azobisisobutyronitrile on styrene (St), St and N-p-hydroxyphenylmaleimide (HPM), St and N- / Bromopropionyloxy) phenylmaleimide (CPPM / BPPM) was prepared by reversible addition-fragmentation chain transfer (RAFT). The structure of the polymer was characterized by UV-Vis and gel (GPC). The results showed that the RAFT homopolymerization of St and the copolymerization of St and N-substituted maleimide showed active polymerization. The molecular weight increased with the conversion rate and the molecular weight distribution was narrow. For RAFT homopolymerization of St, the “cap efficiency” in the PSt chain decreased gradually with the conversion rate due to the diradical termination.For RAFT copolymerization of St with N-substituted maleimide , The formation of charge-transfer complexes significantly increased the rate of copolymerization and promoted the formation of alternating structures.Attorney Docket No .: TS-025-WO-PCT, the atom transfer radical polymerization of St was initiated with P (St-alt-BPPM) to prepare comb PSt, The polymerization process in a highly polar solvent loses controllability and the resulting product has a very high molecular weight while the molecular weight of the resulting polymer in the bulk polymerization is relatively narrow, Controllability.