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• W1491036765 abstract "A commercial sample of poly(vinyl alcohol) (Mw of 45,000) has been fractionated on a preparative scale by gel permeation chromatography. Several fractions were obtained and these were characterized by ultracentrifugation, acetate analysis, and viscometry. The Mw of the fractions ranged from 4,000 to 70,000. The acetate content and values for the Huggins/Martin constant, calculated from the viscosity data, showed no variation with molecular weight. The following Mark-Houwink equation was established: [η]25°C = 2.7 × 10−4Mw0.71. By use of the Stockmayer-Fixman equation the polymer-solvent interaction parameter, χ1, was found to be 0.465. The effective hydrodynamic dimensions and the rms dimensions of the polymer coils in solution were calculated from the ultracentrifugation and viscosity data, respectively, for each fraction. These fractions were used for a study of the dependence of adsorption on molecular weight. The amount adsorbed at the plateau of the isotherm, Λ, and the adsorbed layer thickness, δ, calculated from ultracentrifugation, both increased linearly with Mw12. The volume occupied by each polymer molecule in the adsorbed state was found to be approximately the same as that occupied by the effective hydrodynamic sphere in bulk solution. However, the adsorbed layer thickness was found to be greater than the effective hydrodynamic diameter of the polymer coils in solution. Thus the adsorption was interpreted in terms of a possible deformation of the random coil but with no interpenetration with or compression of adjacent adsorbed molecules." @default.
• W1491036765 created "2016-06-24" @default.
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• W1491036765 date "1974-10-01" @default.
• W1491036765 modified "2023-10-07" @default.
• W1491036765 title "A comparison of the volume occupied by macromolecules in the adsorbed state and in bulk solution" @default.
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• W1491036765 doi "https://doi.org/10.1016/0021-9797(74)90298-7" @default.
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