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研究了少量N-[4-(α-溴代异丁酰氧基)苯基]马来酰亚胺(BiBPM)与大量甲基丙烯酸-N,N-二甲氨基乙酯(DMAEMA)在CuBr/N,N,N′,N″,N″-五甲基二乙烯三胺(PMDETA)催化下的自缩合原子转移自由基共聚合(SCATRCP).分别利用气相色谱、三检测凝胶渗透色谱测定了聚合反应过程中DMAEMA的转化率、所得聚合物(PDMAEMA)的分子量与分子量分布、绝对分子量和特性黏数等随着反应时间的变化.结果表明,在以上聚合过程中,PDMAEMA的分子量随着聚合的进行而不断上升,但是支化度持续下降.由此可知,在聚合早期就形成了低分子量而高支化度的PDMAEMA,在聚合后期,主要进行DMAEMA的ATRP,导致支化度随着分子量的上升而逐渐下降.
The effects of a small amount of N- [4- (α-bromoisobutyryloxy) phenyl] maleimide (BiBPM) and a large amount of DMAEMA on CuBr (SCATRCP) catalyzed by PMDETA / N, N, N ’, N “, N” -pentamethyldiethylenetriamine (PMDETA) were determined by gas chromatography and gel permeation chromatography The conversion of DMAEMA, molecular weight and molecular weight distribution (PDMAEMA), absolute molecular weight and intrinsic viscosity of the obtained polymer (PDMAEMA) were measured with the reaction time.The results showed that the molecular weight of PDMAEMA With the progress of polymerization, but the degree of branching continued to decline, it was found that PDMAEMA with low molecular weight and high degree of branching was formed early in the polymerization and that ATRP of DMAEMA was mainly carried out in the late stage of polymerization, leading to the degree of branching With the rise of molecular weight and gradually decline.