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对于硝酸(HNO_3)溶剂中以过硫酸铵—乙酰基丙酮—硝酸高铁[(NH_4)_2S_2O_8—CH_3COCH_2COCH_3-Fe(NO_3)_3]氧化还原体系为引发剂的丙烯腈—丙烯酸甲脂—甲叉丁二酸[AN-MA-IA]的三元共聚反应进行了研究。在反应动力学的实验基础上对反应机理作了分析,得出如下结论:聚合反应速率与单体浓度的1.5次方及过硫酸铵[(NH_4)_2S_2O_8]浓度的0.5次方成正比,与乙酰基丙酮(CH_3COCH_2COCH_3)及硝酸高铁[Fe(NO_3)_3]浓度关系不大;分子量与单体浓度的0.5次方成正比,与(NH_4)_2S_2O_8浓度的0.5次方成反比,与Fe(NO_3)_3浓度无关。CH_3COCH_2COCH_3是链转移剂,其浓度的增大会使分子量下降,在可能的反应历程推导的基础上建立了速率方程。
In the nitric acid (HNO_3) solvent, ammonium persulfate - acetylacetone - nitric acid ferric nitrate [(NH_4) _2S_2O_8-CH_3COCH_2COCH_3-Fe (NO_3) _3] redox system was used as initiator, acrylonitrile-methyl acrylate- The ternary copolymerization of acid [AN-MA-IA] was studied. The reaction mechanism was analyzed based on the experiment of reaction kinetics, and the following conclusions were drawn: The polymerization rate is proportional to the 1.5th power of monomer concentration and 0.5th power of ammonium persulfate [(NH_4) _2S_2O_8], and The concentration of acetylacetone (CH_3COCH_2COCH_3) and ferric nitrate [Fe (NO_3) _3] has little relation with the concentration of (NH_4) _2S_2O_8. The molecular weight is proportional to the 0.5th power of monomer concentration, ) _3 concentration has nothing to do. CH_3COCH_2COCH_3 is a chain transfer agent. The increase of its concentration leads to the decrease of molecular weight. The rate equation is established on the basis of the possible reaction history.