The Physical and Molecular Properties of Some Nematic Fluorobiphenylalkanes

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Abstract
Measurements are reported of the electric permittivities, refractive indices and elastic constants for four members of the homologous series of alkyl-cyclohexyl alkyl-fluorobiphenyl ethanes. The results are analysed to give values for the order parameters of the nematogens, and in conjunction with dilute solution measurements on the mesogens yield values for the molecular properties of dipole moment and polarisability. The dielectric anisotropy of the materials is measured to be close to zero (∼0.05), and changes sign from negative to positive with increasing temperature.

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