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- W2018336134 abstract "Stress relaxation experiments have been performed from a steady shear rate on monodisperse polystyrene solutions with molecular weight Mw ranging from 1.3 × 105 to 1.6 × 106 and concentration C ranging from 0.05g ml−1 to 0.4g ml−1. Tangential stress data are analysed using a long relaxation time, τ2 and a short one τ1. At long times, relaxation curves η− are parallel so that τ2 is shear-rate independent. The behaviour of τ1 shows the same features as the viscosity and normal stress functions: i.e. a constant value τ10 at low shear rates and a power-law behaviour at high shear rates. Furthermore τ2 and τ10 ∼ M3.4wC4. The initial rate of relaxation defines an elastic parameter [dη−/dt]0. In the limit of low shear rate, we obtain −[dη− /dt]0 ⋍2/Je0. In contrast to the elastic compliance Je, [dη− /dt]0 is found to be shear-rate independent. In contrast to earlier assertions, we found Je0 to be slightly dependent on molecular weight: Je0 ∼ -1 /[dη− /dt]0 ∼ M0.5wC−1.5. Two rheological relations between steady normal stress values and transient tangential stress measurements were tested. Only Yamamoto's equation was found to be consistent with data obtained on the samples of lowest molecular weight (Mw <106. Neither Yamamoto's equation nor the test for the BKZ model were found to be valid for the sample of highest molecular weight (Mw = 1.3 × 106) at concentrations above 0.1 g ml−1." @default.
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- W2018336134 title "Behaviour in shear flow of monodisperse polystyrene solutions: analysis and correlations for steady flow and shear stress relaxation" @default.
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- W2018336134 doi "https://doi.org/10.1016/0377-0257(87)87004-0" @default.
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