胺甲基化聚丙烯酰胺稀溶液行为的研究——pH值对粘性行为及其絮凝作用的影响

Study on Solution Behavior of Cationic Polyacrylamide——Effect of pH on the Viscosity Behavior and Flocculation Properties

pH值对胺甲基化聚丙烯酰胺(CPAM)稀溶液粘性行为的研究表明:不同的CPAM-H_2O溶液体系(胺化度28.8～38mol％,外加盐浓度0～0.2M)的粘性行为,特性粘数[η]和Huggins常数k′随溶液pH值变化分别是现极大值和极小值;CPAM对有机污泥脱水絮凝作用随溶液pH值变化存在极大值。本文从CPAM电荷的形成、电荷密度的增加以及屏蔽出发讨论了上述两种极限现象。

The viscosity behavior of cationic polyacrylamide (CPAM) from the Mannish re-action of PAM, with different degrees of amination (28.8 and 38.0 mo1%) in water withadded salt (0-0.2 M NaNO_3) and covering pH range of 1-10, have been investigated.It was found that the intrinsic viscosity and Huggins constant k' show a maximum atabout pH=3, respectively. And also the maximum flocculation toword organic sludgewith opposite charges exist at almost same pH. This finding can be interpreted by theformation, increase and shielding of the charges on the chain of CPAM.