双水相共聚法合成阳离子聚丙烯酰胺

 摘要：以聚乙二醇（PEG）水溶液为连续相，偶氮二异丙基脒盐（V50）为催化剂，进行丙烯酰胺（AM）与阳离子单体甲基丙烯酰氧乙基三甲基氯化铵（DMC）的双水相聚合，制备出水溶性聚合物乳液。考察了连续相的浓度对体系转化率的影响以及引发剂含量、单体摩尔配比、单体含量、反应温度等因素对聚合物相对分子质量和聚合体系粘度的影响。实验结果表明，双水相体系在PEG水溶液中PEG的质量分数(w(PEG))大于6.0％ 时才能稳定存在，聚合体系的转化率随着w(PEG)的增加而降低。在总单体质量分数为18%、AM与DMC摩尔比n(AM) : n(DMC)=9:1、w(PEG)=7.5％、引发剂V50质量分数w(V50)=0.029％、反应温度为65℃的最优条件下，聚合体系保持了较高的稳定性。

SYNTHESIS OF CATIONIC POLYACRYLAMIDE BY AQUEOUS TWO-PHASE POLYMERIZATION

Abstract: Aqueous two-phase polymerization of acrylamide (AM) and N,N-dimethyla minoethyl methacrylate methyl chloride quaternary salt (DMC) was carried out in the continuous polyethylene glycol (PEG) aqueous solution phase and with V50 as initiator. The effects of mass fraction of PEG aqueous solution on the conversion and the effects of the mass fraction of initiator, the monomer ratio and temperature and monomer on the viscosity of variation and relative molecule mass of polymer were investigated. The results showed that the aqueous two-phase polymerization system was stable when the mass fraction of PEG (w(PEG)) exceeded 6.0%. The conversion of polymerization decreased with the increase of w(PEG). Under the optimum condition: w(Monomer)=18%, n(AM) : n(DMC)=9:1, w(V50)= 0.029％, w(PEG)=7.5%, polymerization temperature of 65℃, aqueous two-phase polymerization system showed good stability.