Abstract. — By analyzing the experimental data obtained in a volumetric study of the 4,4'-di( p,n alcoxybenzylideneamino) biphenyl series, we have calculated the molar volume of the aromatic and aliphatic parts of the molecules as a function of temperature. The aliphatic chains melt in a single step at the transition from the crystal to the first smectic phase. The degree of disorder in the aromatic layers increases stepwise from one polymorphic phase to the next.
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Guillon et al. (1976) studied this question.
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