论文部分内容阅读
虽然Santappa等早已报道Ce~(4+)(高氯酸铈)/甲醛体系能引发丙烯腈(AN)、甲基丙烯酸甲酯(MMA)的聚合,但对醛的活性以及参与引发单体聚合的自由基都未有详细报道,近来孙燕慧等发现脂肪醛能显著促进Ce~(4+)(硝酸铈铵CAN)引发丙烯酰胺(AAM)的聚合,而且醛的活性远大于相应的醇。至于芳香醛对于Ce~(4+)引发烯类单体的聚合的影响也未见详细报道。本文扼要报道苯甲醛(BA)及其衍生物对-硝基苯甲醛(PNBA)、间-硝基苯甲醛(MNBA)、间-溴苯甲醛(MBBA)、对-氯苯甲醛(PCBA)对Ce~(4+)(CAN)存在下丙烯酰胺聚合的影响,测定了其聚合速率,以UV吸收光谱、ESR波谱测定
Although it has been reported by Santappa et al. That Ce ~ (4 +) (ceric perchlorate) / formaldehyde system can initiate the polymerization of acrylonitrile (AN) and methyl methacrylate (MMA), the activity of aldehyde and the monomer Of the free radicals are not reported in detail. Recently, Sun Yanhui et al found that fatty aldehydes can significantly promote the polymerization of acrylamide (AAM) by Ce ~ (4 +) (cerium ammonium nitrate), and the aldehyde activity is far greater than that of the corresponding alcohols. The effect of aromatic aldehydes on the polymerization of Ce ~ (4+) initiated alkene monomers has not been reported yet. In this paper, the effects of p-nitrobenzaldehyde (PNBA), m-nitrobenzaldehyde (MNBA), m-bromobenzaldehyde (MBBA) and p-chlorobenzaldehyde (PCBA) The effect of acrylamide polymerization in the presence of Ce ~ (4 +) (CAN) was studied. The polymerization rate was measured by UV absorption spectroscopy and ESR spectroscopy