A cationic polyacrylamide with high molecular weight was synthesized by inverse phase sus-pension polymerization using acrylamide and acryloxyethyl trimethylammonium chloride as monomers in the presence of (NH4)2S2O8/NaHSO3/VA-044 as complex initiators.The effects of initiator con-centration,dispersants and their concentrations,stirring speed and ratio of organic solvent to water on the molecular weight of CPAM and conversion of monomers were systematically investigated.The op-timized polymerization conditions were as follows:w(VA-044)and w[(NH4)2S2O8/NaHSO3]was 40×10-6and 60×10-6,respectively,dispersant Span60/Span80[m(Span60): m(Span80)= 1:1] was m(Span60/Span80): m(cyclohexane)= 3 : 97,and m(oil): m(water)= 1.5 : 1,the stirring speed was 300 r/min.The cationic polyacrylamide with molecular weight of 1 050×104g/mol was pre-pared and monomer conversion reached 97.5% under the optimized reaction conditions.FTIR,1H NMR and TG were used to characterize the synthesized polymer as CPAM,which showed good ther-mal stability and retention effect.%以丙烯酰胺 (AM)和丙烯酰氧乙基三甲基氯化铵 (DAC)为单体,以过硫酸铵[(NH4)2S2O8]/亚硫酸氢钠(NaHSO3)/偶氮二异丁咪唑啉盐酸盐(VA-044)为复合引发剂,采用反相悬浮聚合法制备阳离子聚丙烯酰胺(CPAM).系统研究了引发剂的用量、分散剂的种类和用量、搅拌速度以及 m(油):m(水)对CPAM 的黏均分子质量和单体转化率的影响.得出较佳反应条件为引发剂w(VA-044)= 40 × 10 -6、w[(NH4)2S2O8/(NaHSO3)]= 60 × 10-6,分散剂为 Span60/Span80 [m(Span60): m(Span80)=1:1],m(Span60/Span80): m(环己烷)=3:97,m(油): m(水)=1.5:1,转速300 r/min,制备出黏均分子质量为1050×104g/mol、单体转化率97.5% 的CPAM.FTIR、1 H NMR、热重分析表征所合成的聚合物为CPAM,并具有良好的热稳定性、较佳的助留助滤效果.
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