Author(s): S. Sreehari Sastry, A. Bindu Madhavi, T. Vishwam, Ha Sie Tiong
Published in: International Journal of Engineering Research & Technology
License: This work is licensed under a Creative Commons Attribution 4.0 International License.
Volume/Issue: Volume. 6 - Issue. 01 , February - 2017
Rheological measurements are reported for thermotropic p-n alkoxy benzoic acid mesogens (n OBA, n = 3-9). All rheological properties measurements were performed using Rheometer. The existence and the extent of a linear viscoelastic range for the series was inestigated. The mesogens display shear thinning (non-Newtonian) behaviour obeying the constitution equation of Carreau model with the power indices from 0.7 to 1.2. No shear‐independent plateau (region II) is observed. dynamic mechanical experiments, are sufficient for describing the the non-spherical structure (rods) of molecules in the nematic and smectic phases which are oriented by the flow field by showing strong elastic nature at different frequencies and temperature studied in their linear viscoelastic region. Dynamic time sweeps indicate a constant relaxation behavior of the normal stress and dynamic moduli to thermal history (5rad/s) attributing no shift from equilibrium position which leads to no change in the molecular weights.
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