Molecular-hydrodynamic study of poly(N-methyl-N-vinylacetamide) macromolecules |
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Authors: | G. M. Pavlov O. V. Okatova A. V. Mikhailova N. N. Ul’yanova I. I. Gavrilova E. F. Panarin |
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Affiliation: | 1.Fock Research Institute of Physics,St. Petersburg State University,Petrodvorets, St. Petersburg,Russia;2.Institute of Macromolecular Compounds,Russian Academy of Sciences,St. Petersburg,Russia |
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Abstract: | High-velocity sedimentation, translational isothermal diffusion, and viscometry in H2O and DMF are used to investigate the samples and fractions of poly(N-methyl-N-vinylacetamide) synthesized by free-radical polymerization and fractionated in a chloroform-diethyl ether system. Molecular masses M and the Mark-Kuhn-Houwink-Sakurada relations are obtained for the fractions in the molecular mass range M × 10−3 = 3.5−540.0. The negative temperature coefficient of intrinsic viscosity is revealed for both solvents. The length of the Kuhn statistical segment and the hydrodynamic diameter of poly(N-methyl-N-vinylacetamide) macromolecules are estimated; the hydrodynamic volumes occupied by water-soluble poly(N-methyl-N-vinylacetamide), poly(1-vinyl-2-pyrrolidone), poly(vinylformamide), and pullulan molecules are compared. |
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