Abstract
In concentrated polymer solutions, the concentration (ϕ) dependence of the terminal relaxation time τd reflects ϕ-dependent changes of several factors, the monomeric friction ζ0(ϕ), the entanglement length, a(ϕ), and the correlation length, ξ(ϕ). Usually, the effect of the latter two factors on τd can be cast in a simple power law, τd ∼ ϕv. This power law form is to be examined for τd after correction of the changes of ζ0 with ϕ, but this iso-ζ0 correction is an unsettled problem. The correction based on the concept of “iso-free-volume” has been attempted in literatures. This study focused on four groups of solutions with different local frictional environments to examine universal validity of this correction. The isothermal data of τd were rheologically measured, and then corrected to the iso-frictional (iso-ζ0) state. After this correction, τd of most solutions in small molecule solvents showed the power law behavior τd ∼ ϕv with exponent of v = 2.0 ± 0.2, irrespective of the solvent type, either neutra...
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