Abstract
Upon flow reversal, two types of responses were observed in the nematic phase of poly(p-phenylenebenzobisthiazole) in methanesulfonic acid depending on the rod concentration and the applied shear rate. At low concentrations and low shear rates, the shear stress versus strain exhibits no overshoot, and the first normal strew transient is always positive. At higher concentrations and higher shear rates, damped oscillations in the shear stress and a negative transient followed by oscillatory behavior in the first normal stress were recorded
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