Molecular Structure and Nematic Liquid Crystalline Behaviour
- 1 January 1977
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 40 (1), 1-17
- https://doi.org/10.1080/15421407708084467
Abstract
In this review some experimental results on the variation of the nematic-isotropic transition temperature TN1 with molecular structure will be evaluated with the aid of expressions for TN1 from molecular-statistical theories. The effect of terminal substituents on TN1 and some typical trends in the values of TN1 for the members of homologous series can be understood from changes in the anisotropic dispersion forces as discussed in Maier and Saupe's theory. The effects of some other structural changes in the molecules on TN1, as for example the variation of central groups, cannot be explained on this basis. Probably it is necessary to take into account as well the molecular repulsions due to the excluded volume.Keywords
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