采用膨胀计法研究了以过硫酸铵-亚硫酸氢钠为引发剂,丙烯酰胺(AM)和二甲基二烯丙基氯化铵(DMDAAC)在水溶液中的共聚反应动力学,测定了相应的聚合表观活化能、聚合速率方程和单体竞聚率.结果表明,当AM与DMDAAC摩尔比分别为5:5、6∶4和7∶3时,表观活化能分别为Ea1=90.61 kJ/mol、Ea2=88.88 kJ/mol和Ea3 =85.15 kJ/mol;聚合反应温度为45℃下,聚合速率方程分别为Rp1=k(M)2.845C(Io)0.51·c(IR)0.61,Rp2 =kc(M)2.77c(Io)0.51c(IR)0.59和Rp3=kc(M)2.73c(Io)0.50c(IR)0.56;2种单体的竞聚率分别为rAM=6.11,rDMDAAC =0.14.上述实验结果可从动力学角度为不同阳离子度共聚物Poly( DMDAAC-co-AM) (PDA)聚合反应速率差别及产物特征黏度值差异进行解释.
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