SOLVATION OF N-CHLORANIL AND N-XYLYLENE TAGGED CATIONIC POLYELECTROLYTES - VISCOSITY MEASUREMENTS IN DIMETHYLFORMAMIDE AND DIMETHYL-SULFOXIDE

Viscosity studies of four new types of cationic polyelectrolytes (mol. wt. 1167 to 6432), where quaternary nitrogens in the molecular chain are tagged with chloranil and xylylene moieties and are interspersed w ith ethylene, phenothiazine and bipyridyl (viologen) linkages, have be en studied in the two; dipolar aprotic solvents viz., dimethylformamid e and dimethylsulphoxide at 298 +/- 5 K. Ail results have been treated on the basis of Fuoss equation, eta(sp)/C=A/(1+B root C), where (eta( sp)/C)(C=O) led to an estimation of intrinsic viscosity ([eta]). The [ eta] values signif y not only the measure of molecular size of the pol ymer but also connote frictional resistances toward solution flow by t he specific conformation of individual molecule in infinitely dilute s olution. The increase in eta(sp)/C with dilution might not be due to c hain expansion in all the cases. Thus, intrinsic viscosities in conjun ction with other derived parameters, such as characteristic ratios (C- infinity), maximum cross dimension ((S) over bar), root mean square en d-to-end distances (< R-g(2)>(1/2)) and plane projection distances (P) at all temperatures have been invoked to propose the hydrodynamic mod els of polycations in the medium of intermediate permittivity.