Abstract
The viscoelastic properties of concentrated solutions of poly(methyl methacrylate) in diethyl phthalate were measured by means of a concentric cylinder type rheometer and capillary viscometer.The Vogel parameters, αf and T0 were calculated from the temperature dependence of viscosity and the shift factor aT obtained from the time-temperature superposition. Moreover, the viscoelastic parameters characteristic of polymer liquids such as the zero-shear viscosity η0, steady-state compliance Je0, and entanglement compliance JeN0 were evaluated from the frequency dependence of the storage shear modulus G′ and the loss modulus G″.With decreasing concentration, the Vogel temperature T0 decreases at higher concentrations, but increases at lower concentrations after passing through a minimum at about 20 wt%. The temperature coefficient of the fractional free volume, αf however, is almost constant at and above 20 wt%, and then rapidly increases with decreasing concentration. This particular concentration of 20 wt% is very near the critical concentration of entanglement coupling.η0 is proportional to w24.0, where w2 is the weight fraction of polymer, in the iso-free-volume state, and this exponent 4.0 is equal to that for molecular weight, which was obtained from the molecular weight dependence of η0. Both Je0 and JeN0 are proportional to w−22, and Je0 is six times higher than JeN0 over the entire range of concentration where JeN0 can be evaluated.
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Masuda, T., Toda, N., Aoto, Y. et al. Viscoelastic Properties of Concentrated Solutions of Poly(methyl methacrylate) in Diethyl Phthalate. Polym J 3, 315–321 (1972). https://doi.org/10.1295/polymj.3.315
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DOI: https://doi.org/10.1295/polymj.3.315
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