Abstract
The storage and loss shear moduli, G′ and G″, have been measured for solutions of a star polystyrene with average number of arms 8.7 and weight-average molecular weight 5000000, by use of the Birnboim—Schrag multiple-lumped resonator. The frequency range was 106 to 6060 Hz and the concentration range 0.001 to 0.013 g/ml. Decalin and di-2-ethyl hexyl phthalate were used as solvents at their respective Θ temperatures, 15 and 21°C, and α-chloronaphthalene as a good solvent at 25°C. The extrapolated intrinsic moduli agree well with the predictions of the Zimm—Kilb theory as evaluated by Osaki and Schrag if the hydrodynamic interaction parameter h* is taken as 0.40 in the Θ solvents and 0.25 in α-chloronaphthalene. The product h*αη, where αη is the expansion factor of the excluded-volume effect as evaluated from the intrinsic viscosity, is about 0.40 instead of 0.21 as observed for linear polymers. The origin of this unexpectedly large value is unclear. The terminal relaxation time is smaller by a factor of 12 to 14 than that of a linear polymer of the same molecular weight; the storage modulus at a given low frequency and concentration, and the steady-state compliance, are correspondingly much smaller than for a linear polymer.
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Mitsuda, Y., Osaki, K., Schrag, J. et al. Infinite-Dilution Viscoelastic Properties of Star Polystyrene with Nine Arms. Polym J 4, 24–28 (1973). https://doi.org/10.1295/polymj.4.24
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DOI: https://doi.org/10.1295/polymj.4.24
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