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采用定时取样研究了以过硫酸钾-亚硫酸氢钠为引发剂,对甲氧基苯辛基二甲基烯丙基氯化铵(ADMAAC)和丙烯酰胺(AM)在水溶液中的共聚反应动力学,测定了相应的聚合速率方程、聚合表观活化能;采用阴阳离子相互作用测定残余ADMAAC的含量,紫外分光光度法测定残余AM的含量,根据单体投料量和残余量差值,得到低转化率下共聚物的组成,按Kelem-Tudos法得到两单体竞聚率。实验结果表明:聚合反应温度在40℃下,聚合速率方程为:Rp=K[M]1.241[KPS]0.52[SHS]0.55;根据Arrhenius经验公式计算出对甲氧基苯辛基二甲基烯丙基氯化铵(ADMAAC)和丙烯酰胺(AM)共聚的表观活化能为73.85kJ/mol,高于AM水溶液均聚合的活化能Ea(70.32kJ/mol);两种单体的竞聚率为rADMAAC=0.197、rAM=4.503,为ADMAAC-AM共聚合反应控制确定了重要的动力学参数。两单体的竞聚率的积小于1,ADMAAC与AM共聚合行为类型是一种无恒比点的非理想共聚行为,共聚物组成曲线,在对角线下方。
Time-sampled samples were used to study the kinetics of copolymerization of p-methoxybenzyl dimethylallyl ammonium chloride (ADMAAC) and acrylamide (AM) in aqueous solution using potassium persulfate-sodium bisulfite as initiator The corresponding polymerization rate equation was determined and the apparent activation energy was measured. The content of residual ADMAAC was determined by the interaction of anion and cation. The content of residual AM was determined by ultraviolet spectrophotometry. Conversion of the copolymer composition, according to Kelem-Tudos method to obtain two monomer reactivity. The experimental results show that the polymerization rate equation is: Rp = K [M] 1.241 [KPS] 0.52 [SHS] 0.55 at 40 ℃. The molar ratio of p-methoxybenzyldimethylenes The apparent activation energy of copolymerization of propyl ammonium chloride (ADMAAC) and acrylamide (AM) was 73.85 kJ / mol, which was higher than that of AM polymerization solution (70.32 kJ / mol) The rate of rADMAAC = 0.197, rAM = 4.503, for the ADMAAC-AM copolymerization control to determine the important kinetic parameters. The reactivity ratio between two monomers is less than 1, and the type of copolymerization behavior between ADMAAC and AM is a kind of non-ideal copolymerization behavior with no constant ratio. The copolymer composition curve is below the diagonal.