DIELECTRIC, VISCOUS, AND ELASTIC PROPERTIES OF MESOGENIC 4-n-HEXYLOXY-4'-CYANOBIPHENYL |

G. Czechowski and J. Jad¿ynInstitute of Molecular Physics, Polish Academy of Sciences Smoluchowskiego 17, 60-179 Poznañ, Poland |

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Received: January 22, 2001 |

The paper presents the results of measurements of the static and
dynamic electric permittivity, the shear viscosity, and the splay and
bend elastic constants for 4-n-hexyloxy-4'-cyanobiphenyl (C_{6}H_{13}O-Ph-Ph-C≡N). On the basis of the static values of the nematic principal permittivities, ε_{||}(T) and ε_{⊥}(T),
the angle between the dipole moment vector and the long axis of
4-n-hexyloxy-4'-cyanobiphenyl molecule, the apparent dipole moment and
the nematic order parameter were determined. From the temperature
dependences of the dielectric relaxation time (corresponding to the
molecular rotation around the short axis) and the shear viscosity, the
strength of the nematic potential and the effective length of
4-n-hexyloxy-4'-cyanobiphenyl molecule (in isotropic phase) were
estimated. The K_{11} and K_{33}
elastic constants were determined from the voltage dependence of the
capacitance of the planar nematic cell with the method proposed by
Gruler et al. and Uchida et al. |

DOI: 10.12693/APhysPolA.99.579 PACS numbers: 64.70.Md, 77.84.Nh, 77.22.Gm, 66.20.+d |