Rotational viscosity γ1 of nematic liquid crystals

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Abstract
The rotational viscosity coefficients γ1 are measured with the rotating field method as a function of temperature in the nematic phases of 4‐methoxybenzylidene‐4′‐n‐butylaniline, 4‐n‐pentyl‐, and 4‐n‐octyl‐4′‐cyanobiphenyl, of the eutectic mixture of two 4‐n‐pentylphenyl 4‐alkoxybenzoates and of the eutectic mixture of the two isomers of 4‐methoxy‐4′‐n‐butylazoxybenzene. Equations are proposed which describe the temperature dependence very well. The Leslie coefficients αi are calculated from the γ1 values and recently measured shear viscosity coefficients.