Non-Newtonian Viscosity of Liquid Crystals Formed by Cholesteryl Oleyl Carbonate

概要

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The steady flow viscosity of cholesteryl oleyl carbonate was determined in a range of shear rate from 0.1 to 70 sec^1 and over a temperature range from 15 to 45℃. A viscosity maximum associated with a marked non-Newtonian behaviour was observed at a temperature range around 31℃ of the cholesteric-isotropic transition. The linearity of the flow curves in the cholestric mesophase suggested that the structure of the liquid crystal was easily broken by a fairly low shear stress. The measurements of the temperature dependence of the d.c. electrical conductivity, the optical transmittivity, and the dynamic rigidity were also carried out. According to Denny-Brodkey's theory, the equilibrium constants between broken and unbroken structures were estimated near the transition temperature.
社団法人応用物理学会の論文
1973-01-05