Equivalent electrical conductivity (Λ) is reported for three series of cationic quaternary ammonium polyacrylamide derivatives with $\hbox{MeSO}_{4}ˆ{‐}$, Cl−, Br− and I− as counterions at 25 °C, the polyion equivalent concentration C ranging from 5.3 × 10−4 to 6.4 × 10−3 N and from 1.0 × 10−3 to 1.4 × 10−2 N. Equivalent electrical conductivity increases with decreasing polyion equivalent concentration, and the sequence of equivalent electrical conductivity Λ of polyelectrolytes for the same series with different counterions in the range of concentration investigated is: $\hbox{MeSO}_{4}ˆ{‐} > \hbox{Cl}ˆ{‐} > \hbox{Br}ˆ{‐} > \hbox{I}ˆ{‐}$. The plots of the counterion–polyion interaction parameter f and degree of dissociation α of polyelectrolyte versus the polyion equivalent concentration C show that the order of counterion associating or binding to polyions for the same polyelectrolyte series in the range of concentration studied is $\hbox{MeSO}_{4}ˆ{‐} < \hbox{Cl}ˆ{‐} < \hbox{Br}ˆ{‐} < \hbox{I}ˆ{‐}$. The chemical structures of the polyion have much influence on the Λ, f and α values of the polyelectrolytes. © 1999 Society of Chemical Industry

Equivalent electrical conductivity (L) is reported for three series of cationic quaternary ammonium polyacrylamide derivatives with MeSO À 4 , Cl À , Br À and I À as counterions at 25°C, the polyion equivalent concentration C ranging from 5.3 Â 10 À4 to 6.4 Â 10 À3 N and from 1.0 Â 10 À3 to 1.4 Â 10 À2 N. Equivalent electrical conductivity increases with decreasing polyion equivalent concentration, and the sequence of equivalent electrical conductivity L of polyelectrolytes for the same series with different counterions in the range of concentration investigated is: MeSOThe plots of the counterion±polyion interaction parameter f and degree of dissociation a of polyelectrolyte versus the polyion equivalent concentration C show that the order of counterion associating or binding to polyions for the same polyelectrolyte series in the range of concentration studied is MeSO