Conformational parameters of poly(N-methyl-N-vinylacetamide) molecules through the hydrodynamic characteristics studies.

Water-soluble PMVA was synthesized by radical polymerization methods. A number of polymer samples were fractionated in the chloroform-diethyl ether system. Fractions were studied by molecular hydrodynamics methods (sedimentation velocity, translational isothermal diffusion and viscosity) in H(2)O and DMF. The molecular masses of fractions were determined and the Kuhn-Mark-Houwink-Sakurada relationships were obtained in the molecular mass range of 3.5 < M x 10(-3) g x mol(-1) <540. A negative temperature coefficient of the characteristic viscosity was obtained in both solvents. The Kuhn statistic segment length and the hydrodynamic diameter of the molecule were estimated for PMVA. The hydrodynamic volumes, occupied by the molecules of PMVA, poly(1-vinyl-2-pyrrolidone), poly(vinylformamide), and pullulan were compared.