Thermodynamic measurements of δH and δS for the nematic-isotropic transition for a homologous series of Siamese Twin diester liquid crystals are reported. These diesters are structurally related as conceptual dimers in the monomer oligomer polymer sequence of liquid crystals with a 4,4′-disubstituted phenyl benzoate mesogenic moiety. Both δH and δS values show an odd:even alternation with carbon number intermediate in magnitude between those for the monomeric and the polymeric mesogens. It is concluded that the Twin diesters are good models for these oligomers in the monomer oligomer polymer progression.
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Griffin et al. (1983) studied this question.
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