CPAM水分散聚合体系的微观相结构及稳定性

Microscopic Phase Structure and Stability of Water Dispersion Polymerization System of Cationic Polyacrylamide

以丙烯酰胺(AM)、甲基丙烯酰氧乙基三甲基氯化铵(DMC)为单体,利用水分散聚合法合成了阳离子聚丙烯酰胺,研究了其微观相结构、分散介质、DMC单体用量等因素对聚合体系黏度及稳定性的影响。结果表明,体系的分散相呈球形存在于分散介质中,分散相为阳离子聚丙烯酰胺(CPAM),连续相为聚乙二醇(PEG)或聚氧化乙烯(PEO)。聚合过程中体系黏度随反应时间的增长先增大后减少,体系稳定性随着连续相用量增多而增大,DMC用量对稳定性的影响也呈现先增后减的趋势。

Cationic polyacrylamide was prepared using acrylamide and 2-trimethylammonium ethyl methacrylate chloride（DMC） as monomers by water dispersion polymerization.The microstructure of the system was investigated by microscopic.The influences of disperse medium,dosage of DMC and other factors on viscosity and stability of the water dispersion polymerization system were also investigated.The micrograph of the product shows that the cationic polyacrylamide disperses in the continuous polyethylene glycol （PEG）or polyoxyethylene（PEO） phase like a pellet.As the polymerization proceeded,the viscosity of the system increases firstly,then decreases gradually.With the increase of the dosage of disperse medium concentrations,the final viscosity of the system increases while the max viscosity of the system decreases rapidly from 143 Pa·s to 20.5 Pa·s.The stability of system improves with growth of the concentrations and relative molecular mass of disperse medium and the value of pH.With the increase of the dosage of DMC,the stability of system enhances at first and then decreases.