Abstract
A series of alkylated statistical copolymers of N-methyl-N-vinylacetamide and N-methyl-N-vinylamine hydrochloride containing C6H13 - C12H25 side aliphatic group in the chain were studied by the methods of molecular hydrodynamics (velocity sedimentation, translational diffusion and viscous flow) in 0.1M NaCl and salt free water solutions, and by flow birefringence. The competition between electrostatic and hydrophilic/hydrophobic interactions manifests differently depending on the ionic strength and the length of the side chains. It was found that the radical length noticeably affects the characteristics of copolymer macromolecules. The hydrodynamic volume decreases and the shear stress optical coefficient increases considerably for the samples with C12H25 side chain groups. This is explained by drastic increase in the hydrophobic interactions which dominate over the electrostatic interactions.
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