Abstract
Shear relaxation moduli G(t, s) were measured for various strains s with a relaxometer of the cone-plate type for concentrated solutions of polystyrene in chlorinated biphenyl. The strain was varied from 0.34 to 25 shear units. The time—temperature reduction method was applicable to the shear-dependent relaxation moduli over the temperature range studied (20—50°C) and the shift factor aT was independent of s. When s was very large, logG(t, s) decreased very rapidly with increasing time in two regions of t (two-step relaxation) while logG(t, s) for small s dropped rapidly only at long times (one-step relaxation). The relative rate of decrease of G(t, s) with increasing s was independent of t when t was larger than a certain time, τk. The maximum relaxation time τm was independent of s while the corresponding strength of relaxation Gm was proportional to ID−0.83 when s was large. Here ID is the first invariant of strain.
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Einaga, Y., Osaki, K., Kurata, M. et al. Stress Relaxation of Polymer Solutions under Large Strain. Polym J 5, 91–96 (1973). https://doi.org/10.1295/polymj.5.91
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DOI: https://doi.org/10.1295/polymj.5.91
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