【摘要】 研究了阻聚剂对自由基聚合活性化的影响,用1H NM R表征了聚合物的结构。发现在甲基丙烯酸甲酯(MM A)自由基聚合体系中加入少量的加成型阻聚剂2,4,6-三硝基苯酚(TNP)或1,4-苯醌(BQ)时,体系转化率降低,引发效率降低,呈现出一定的缓聚性质;同时得到的聚合物分子量变小,分子量分布变窄,具有一定的“活性”/可控的特征。链转移型阻聚剂如对羟基苯甲醚(4-M P)和对苯二酚(HQ)则不能起到类似的效果。更多还原

【Abstract】 The living characteristic of inhibitions for radical polymerization was studied.It was found that both the conversion and the initiating efficiency of methyl methacrylate(MMA) polymerization system were decreased in the presence of small amounts of addition inhibitions 2,4,6-trinitrophenol(TNP) or Benzoquinone(BQ),the system exhibited some retardation characteristics;At the same time,the molecular weights of obtained polymers was small and the molecular weight distributions(MWD) was narrow,it was suggested that this polymerization system exhibited some "living"/controlled radical polymerization characteristics.However,chain transfer inhibitions such as 4-methoxylphenol(4-MP) and hydroquinone(HQ) cannot acquire the similar results.()~1H NMR was used to characterize the structures of resultant polymers and the proposed mechanism was also investigated.更多还原