高分子準希薄溶液の最大緩和時間

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  • The Longest Relaxation Time in Semidilute Polymer Solutions

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The longest relaxation time τm, of linear polystyrene solutions was studied by stress relaxation after cessation of steady shear flow. The concentration of the solutions are in the region where one can call“semidilute” for zero-shear viscosityη0 or “dilute” for steady-state compliance Je. The time τm was compared with the weight-average relaxation time τw which was defined as product of η0 and Je. It is concluded that τm is proportional to τw in this region, as in a well-entangled region. It is also pointed out that the concentration dependence of characteristic time for self-diffusion is similar to that of the relaxation times obtained from viscoelastic measurements.

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