The polymorphism of the 4 cyanobiphenyl-4′-n-alkoxy benzoate esters is investigated and a reentrant nematic phase is observed for the n = 8 and n = 9 homologues. X-Ray studies confirm this fact and show that in the reentrant phase the cybotactic groups are SA-like at high temperature near the SA phase while they appear SC-like at lower temperatures.
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Hardouin et al. (1979) studied this question.
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