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Dilatometric properties of two nematic liquid crystals,p-azoxyanisole (PAA),p-p-di-n-pentyloxy azoxybenzene (PPAB) and their mixtures have been measured with an Anton Paar digital density meter. It has been found that in both the nematic and isotropic phases of all the compositions, the density varies linearly with the temperature except in the region 2°C below the nematic isotropic transition. The density data have been used to determine the value of the thermal expansion coefficient.
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Phaovibul et al. (1980) studied this question.
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