反相悬浮法合成超高分子量AM/AA/AMPS及盐的共聚物

Synthesis of super high molecular weight Co-polymer of AM/AA/AMPS and its salt by inverse suspension polymerization

以丙烯酰胺 (AM)、丙烯酸 (AA)和 2 丙烯酰胺 2 甲基丙磺酸 (AMPS)为单体 ,采用反相悬浮聚合法制备了超高分子量的AM/AA/AMPS及盐的共聚物。本实验固定丙烯酰胺的加入量 ,研究了中和度、2 丙烯酰胺 2 甲基丙磺酸和丙烯酸用量 ,引发剂浓度、抗交联剂及其他助剂对合成共聚物分子量的影响。结果表明 ,本实验的中和度为 70 %比较适宜。在此中和度下 ,AMPS的适宜用量范围为AM的 7 5 %～ 16 2 5 % ;AA的适宜用量范围 4 4 %～5 5 % ;(NH4) 2 S2 O8的适宜用量范围为AM/AA/AMPS总量的 0 0 7%～ 0 12 % ;分子量随CO(NH2 ) 2 的增加而明显升高 ;甲基丙烯酸N ,N 二甲氨基乙酯 (DMAEMA)的适宜用量范围为 0 0 6 %～ 0 10 % ;使用抗交联剂可以解决产品交联造成的难溶问题 ,但加入量不宜过多 ,否则分子量会下降 ;分子量调节剂醋酸钠的用量在 1 2 4 %～ 1 5 4 %范围内可以使产品的分子量达最佳值。本实验可以得到分子量达 1 9× 10 7的AM/AA/AMPS及盐的共聚产物。

Synthesis of super high molecular weight AM/AA/AMPS and its salt by inverse suspension polymerization of acrylamide(AM)/acrylate(AA)/acrylamidomethylpropane sulfonic acid(AMPS) was studied. The effects of the neutralization degree and content of acrylate and acrylamidomethylpropane sulfonic acid, concentration of initiators, regulator of molecular weight and the agents for preventing cross linking on the molecular weight of the co polymer were studied. When the neutralization degree was constant, the best concentration scope of (NH 4) 2S 2O 8 was 0 07%～0 12%. With the increase in CO(NH 2) 2 concentration, the molecular weight significantly increased, and the best concentration scope of DMAEMA was 0 06%～0 10%. In addition, the agents for preventing cross linking were used to prevent the cross linking reaction and its content was not allowed too high, and the best concentration scope of sodium acetate (the regulator of molecular weight) was 1 24%～1 54%. Super high molecular weight (1 9×10 7) co polymer of AM/AA/AMPS and its salt can be obtained through this process.