等离子体引发丙烯酰胺与2-甲基-丙烯酰氧乙基三甲基氯化铵水溶液聚合

Polymerization of Acrylamide with(2-Methacryloyloxyethyl) Trimethyl Ammonium Chloride Initiated by Plasma in Aqueous Solution

研究了等离子体引发丙烯酰胺(AM)和2-甲基-丙烯酰氧乙基三甲基氯化铵(DMC)水溶液聚合制备线性阳离子聚电解质的工艺方法。测定了不同反应压力下反应液的沸点,得到最佳的反应压力为133Pa;优化了引发聚合的条件:放电时间40s、放电功率60W、反应溶液pH=4.5、w(AM+DMC)=30%、m(AM)∶m(DMC)=1∶1、聚合时间24h、聚合温度40℃。在优化条件下,聚合物的最高特性粘数为966cm3/g。探索了等离子体引发AM-DMC水溶液聚合的机理:AM与水溶液中H+结合形成的HAM自由基起引发作用,进而与AM或DMC单体进行反应,生成线性聚合物。

Copolymerization of acrylamide（AM）with（2 - methacryloyloxyethyl）trimethyl ammonium chloride （DMC） initiated by plasma in aqueous solution was studied. Linear cationic polyelectrolyte polymer P （AM - DMC） was obtained. Boiling points of reaction solution under different pressures were determined. Factors effecting intrinsic viscosity of polymer were optimized as following： discharge time 40 s, discharge power 60 W and pH of aqueous solution 4.5. Under above conditions, intrinsic viscosity of the linear copolymer could reach 966 cm^3/g. The polymerization mechanism was also studied, which showed that free radical HAM · formed by combination AM with H ^＋ was effective in initiation of copolymerization.