二甲基二烯丙基氯化铵-丙烯酰胺共聚物的合成与结构表征

用二步法合成了季铵盐阳离子单体N ,N 二甲基二烯丙基氯化铵 (DMDAAC)。第一步 ,向反应瓶中加入 1mol二甲胺的水溶液 ,控制温度 40℃以下 ,滴加 1mol氯丙烯和 1molNaOH水溶液 (其质量分数为 40 % )。滴加完后再反应 2h,分取上层有机相 ;第二步 ,将有机相加入反应瓶中 ,同时加入适量的丙酮 ,控制温度在 30℃以下 ,滴加 1mol氯丙烯 ,反应 4h。过滤、洗涤、干燥得阳离子单体DMDAAC ,总转化率为 63%。以n(DMDAAC)∶n(丙烯酸胺 ) =1∶3在水溶液中共聚 ,合成了阳离子共聚物 P(DMDAAC AM) ]。反应以分别占单体总质量的 0 5 %的过硫酸钾和亚硫酸氢钠为引发剂 ,反应温度 40℃ ,反应时间 6～ 8h。并利用IR、1HNMR对单体和共聚物进行了结构表征。

Synthesis and Structural Characterization of Copolymer of Dimethyldiallylammonium Chloride and Acrylamide

The quaternary ammonium salt cationic monomer dimethyld ia llylammonium chloride (DMD C) was synthesized by two steps.Firstly,1 mole of aq ueous solution of dimethylamine was charged in a flask,1 mole of allyl chloride a nd 1 mole of 40% aqueous solution of caustic soda were added dropwise in such a way that both additions ended at the same time.The temperature was maintained be low 40 ℃.After additions the reaction was continued for 2 h.Then the upper laye r of organic phase was separated.Secondly,the organic phase obtained above was d issolved in an appropriate amount of acetone,then another 1 mole of allyl chlori d e was added while the temperature was maintained below 30 ℃ by cooling.After 4 h,the separated crystals was filtered,washed and dried.Thus the cationic monomer dimethyldiallylammonium chloride was obtained.The yield was 63% in general.The copolymer of DMD C and acrylamide(AM)(mole ratio=1∶3)was prepared in aqueous s olution with redox initiator.The reaction proceeded at 40 ℃ for 6～8 h.Stru ctures of the monomer and copolymer were characterized by IR and 1 HNMR.