Abstract
Flow properties such as complex moduli, complex moduli with superimposed steady shear and non-Newtonian viscosity were measured on moderately concentrated solutions of polystyrene in chlorinated diphenyl. The range of molecular weight M and of concentration c was 5.6×105–2.5×106 and 1–4.5 g/dl, respectively. The real part G′ and the imaginary part G″ of the complex modulus of solutions with various molecular weights and concentrations were superimposed to give single composite curves, respectively, if G′M and G″M were plotted against ωηM, where ω is the angular frequency and η is the zero-shear viscocity. Thus the steady shear compliance Je is proportional to M and is independent of c. The values of the real part G′ and the imaginary part G″ of the complex moduli with superimposed shear decreased when the rate of superimposed shear κ increased. They decreased more rapidly in the range of low frequency than in the range of high frequency. The degree of decrease was larger for the real part than for the imaginary part. This effect of the superimposed steady shear on the complex moduli, together with the molecular weight and concentration dependence of the complex moduli, were qualitatively interpreted by assuming molecular aggregates in moderately concentrated polymer solutions.
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Osaki, K., Kurata, M. & Tamura, M. Flow Properties of Moderately Concentrated Solutions of Polystyrene in Chlorinated Diphenyl. Polym J 1, 334–340 (1970). https://doi.org/10.1295/polymj.1.334
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DOI: https://doi.org/10.1295/polymj.1.334