Abstract
The role of the segment friction coefficient in slow chain dynamics in concentrated polymer solutions was studied from temperature dependence of the self diffusion coefficient Ds, and the steady viscosity η. Concentrated solutions of two polystyrene samples (code F4; Mw=43900 and F40; Mw=355000) in dibutyl phthalate with concentration of 40 and 50 wt% were used as test samples. Solutions of their blend containing 1 wt% of labeled F40 were also studied at total concentration of 40 wt%. For unentangled PS (F4) solutions, temperature dependence of Ds and η at each concentration was found to be in good agreement with each other and the functional form was well described in terms of the free volume theory. The function with the same values of the free volume parameters at each concentration is also applicable for description of T dependence of Ds of entangled PS (F40) solutions and also of Ds of F40 in the blend solution. The same segment friction coefficient was concluded to be operative in mass and momentum transports in concentrated solutions irrespective of the entanglement coupling.
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Nemoto, N., Kojima, T., Inoue, T. et al. Self Diffusion of Polymers in the Concentrated Regime I. Temperature Dependence of the Self Diffusion Coefficient and the Steady Viscosity of Polystyrene in Dibutyl Phthalate. Polym J 20, 875–881 (1988). https://doi.org/10.1295/polymj.20.875
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DOI: https://doi.org/10.1295/polymj.20.875