Abstract
The viscoelastic properties of concentrated solutions of linear and randomly branched polystyrenes were measured and compared with each other. From the frequency dependence of the storage shear modulus G′ and the loss modulus G″, the characteristic parameters in the terminal zone, such as zero-shear viscosity η0 and steady-state compliance Je0, were evaluated. The dependence of these parameters on the molecular weight and concentration were discussed. The zero-shear viscosity and its dependence on molecular weight for the solution of randomly branched polystyrene are lower than those of linear polystyrene. The steady-state compliance is proportional to Mw0.84 for the branched samples, while it does not depend on molecular weight for the linear polymer. These results lead to the suggestion that the maximum relaxation time is proportional to Mw2.3 and Mw3.5 for branched and linear polystyrene solutions, respectively. The concentration dependence of the steady-state compliance for the branched polymers is also much less than that of the linear ones. Comparing the frequency dependence curves of G′ for the randomly branched and linear polystyrenes, there seems to be a significant difference in the shape of the relaxation spectra in the region associated with entanglement coupling. This behavior is considered to be due to the difference in the two chain structures.
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Masuda, T., Nakagawa, Y., Ohta, Y. et al. Viscoelastic Properties of Concentrated Solutions of Randomly Branched Polystyrenes. Polym J 3, 92–99 (1972). https://doi.org/10.1295/polymj.3.92
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DOI: https://doi.org/10.1295/polymj.3.92
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