Abstract
Tensile creep measurements were made on seven narrow-distribution polystyrene samples. The range of molecular weights was from 7.50×104 to 2.90×106 and that of temperature from 96 to 198°C. The data were all reduced to 140°C by the method of reduced variables. The shift factors were identical for all samples and followed the WLF equation. The free volume parameters were calculated by the method of Williams; the fractional free volume at Tg was 0.028 and the constant B in the Doolittle equation was 0.97. In the transition zone, all master curves, except that of the highest molecular-weight sample L-1, coincided. The master curve of sample L-1, shifted to the right on the logarithmic time scale by a factor of about 0.6, compared with those of other samples, and the retardation spectrum L(τ) disappeared in the rubbery zone. A close relationship between these two observations was suggested. The average molecular weight between entanglements was independent of molecular weight as evaluated by ordinary methods. The dependences on molecular weight of the quantities, ηl De and τm, were also examined. It was found that ηl and τm varied as 3.3 power of molecular weight and De was independent of molecular weight.
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Nemoto, N. Viscoelastic Properties of Narrow-Distribution Polymers. II. Tensile Creep Studies of Polystyrene. Polym J 1, 485–492 (1970). https://doi.org/10.1295/polymj.1.485
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DOI: https://doi.org/10.1295/polymj.1.485
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