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Abstract
We have measured the shear elastic modulus and the viscosity values of a pyramidal liquid crystal both normal and parallel to the columnar axis. It was observed that above frequencies of 50Hz, the sample behaves as a Maxwell solid characterized by constant G and eta values. The shear modulus is in the range of 106-107 N m-2, typical for rubbers and polystyrene foams. The viscosity values are in the range of 103-104 Pas, comparable to polymer melts. The observations can be qualitatively explained by temporary entanglements between the side chains of the bowl-shaped molecules, as observed by previous X-ray studies.