Moderately concentrated solutions of polystyrene. I. Viscosity as a function of concentration,temperature, and molecular weight |
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Authors: | B L Hager G C Berry |
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Abstract: | Data on the viscosity η of moderately concentrated solutions of polystyrene are reported. Several solvents were investigated, including cyclopentane solutions over a temperature span between θU = 19.5°C and θL = 154.5°C. The data were analyzed in terms of a relation giving η as a function of α φM, where αφ is the expansion factor for the chain dimensions in a solution with volume fraction φ of polymer with molecular weight M. It is shown that values of αφ so determined decrease as ? lnαφ/? lnφ = (1 ? 2μ)/6μ for φ greater than φ* = 0.2M/s3 for moderately concentrated solutions, where s is the root-mean-square radius of gyration and μ = ? lnη]/? lnM with η] the intrinsic viscosity. |
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