Sizes of Macromolecules of Copolymers of N-Methyl-N-Vinylacetamide and N-Methyl-N-Vinylamine Hydrochloride with Low Charge Linear Density

Series of copolymers of N-methyl-N-vinylacetamide and N-methyl-N-vinylamine hydrochloride containing from 1.5 to 17% mol % of charged units were obtained by partial hydrolysis of poly(N-methyl-N-vinylacetamide). A complex of hydrodynamic investigations of their diluted solutions (viscous flow, velocity sedimentation, translational diffusion) was performed in 0.2 M NaCl in order to determine the molecular characteristics of copolymers. Viscosimetric investigations were performed in salt-free solution (ionic strength similar to 10(-6) M) to study intrachain electrostatic interactions; the influence of charge linear density on the sizes of polyelectrolyte macromolecules was studied under these conditions. The examination of hydrodynamic volumes, equilibrium rigidity, and/or swelling coefficients of charged chains was performed.