阳离子型聚丙烯酰胺絮凝剂的合成及表征

系统研究了丙烯酰胺(AM)与二甲基二烯丙基氯化铵(DMDAAC)共聚反应制备阳离子絮凝剂的工艺条件。对聚合温度、引发剂浓度、单体质量分数等对合成目标产物的影响进行了详细探索，并对聚合产物的结构和热行为进行了表征。结果表明，最佳聚合条件为聚合温度55 ℃，过硫酸铵与甲醛次硫酸氢钠（质量比为7:3）总质量分数0.0125%，偶氮二异丁脒盐酸盐(V-50)的质量分数0.0125%，单体质量分数35%，阳离子度35%；在最佳工艺条件下，所得阳离子聚丙烯酰胺絮凝剂(CPAM)的分子量为2.5×10⁶，具有良好的絮凝效果。

Synthesis and characterization of a cationic polyacrylamide flocculant

A cationic polyacrylamide flocculant has been prepared by copolymerization of acrylamide(AM) and dimethyl diallyl ammonium chloride(DMDAAC).The effects of varying the reaction temperature,concentration of initiator,and monomer mass fraction on the final polymer were investigated.The optimal conditions were found to be as follows:a reaction temperature of 55 ℃,total mass fraction of(NH4)2S2O8 and NaHSO3·CH2O·2H2O of 0.0125%,mass ratio of(NH4)2S2O8/NaHSO3·CH2O·2H2O of 7∶3,mass fraction of 2,2′-azobis(2-methylpropionamide)dihydrochloride(V-50) of 0.0125%,monomer concentration of 35%,and cationic degree of 35%.The resulting cationic polyacrylamide(CPAM) with a molecular weight of 2.5×106 had a strong flocculation capability.The chemical structure and thermal behavior of CPAM were characterized by FT-IR and TG respectively.The TG results showed that the thermal stability of CPAM was much better than that of AM.