阳离子聚丙烯酰胺水包水乳液的制备及结构与性能关系研究

Cationic polyacrylamide water-in-water-emulsion:Preparation and investigation of relationships between its structure and properties

以丙烯酰胺(AM)、甲基丙烯酸二甲氨基乙酯(DM)为共聚单体,通过在浓度较低的硫酸铵溶液(PS)中引入自制聚电解质分散剂(PDMC)和水溶性高分子稳定剂(PAB)获得了稳定的阳离子聚丙烯酰胺水分散液(CPAM),该CPAM表观黏度(η)为525 mPa.s,特性黏数([η])为650 mL/g,储存稳定期达到90 d以上,并得出了最佳合成条件为w(PAB)(占反应单体)=13%、w(PDMC)(占水分散体系)=33%、[η](PDMC)=35 mL/g、w(PS)(占水分散体系)=3%。分散稳定剂对CPAM的稳定性影响很大,且随着w(CPAM)的降低,CPAM水分散体系假塑性逐渐减弱,并表现出先迅速溶胀直至凝胶而后逐渐溶解的性质。

A new stable cationic polyacrylamide water dispersed （CPAM） is prepared by the copolymerization of acrylamide（AM） and dimethylaminoethylacrylate （DM） with polyelectrolyte as dispersant （ PDMC ） and water soluble polymer as stabilizer（PAB）. The apparent viscosity（η） and intrinsic viscosity（ [ η] ） of the CPAM are respectively 525 mPa · s and 650 mL/g,and it can also be stored for more than 90 days. The optimal conditions are as follows：w（PAB） （ ratio to momomer） = 13 %, w （PDMC） （ to the whole water dispersed） = 33 % , [ η] （ PDMC ） = 35 mL/g, w （ PS ） （ to the whole water dispersed） = 3 %. The dispersion stabilizer has a great effect on the stability of CPAM, and as w （CPAM） reduces,the pseudoplastic of CPAM water dispersed is weaken,while the CPAM has a great change from water dispersed to a gelatin through a violent swelling and then it is dissolved gradually.