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Abstract
The mesogenicities of 4,4′″-dialkyloxyquaterphenyls (DAQP) and dialkyl quaterphenyl-4,4′″-dicarboxylates (DCQP) were studied by differential scanning calorimetry, optical microscopy and miscibility tests. The DAQP homologues, for which the number of carbon atoms in the alkyloxy group (n) is 1–9, showed a SA phase, and the higher homologues (n = 9–18) showed a Sc phase. The propyl, butyl and pentyl esters of DCQP showed a SA phase, and the octyl and dodecyl esters showed SA and Sc phases. The isopropyl, isobutyl, 2-ethylhexyl and cyclohexyl esters showed a Sc phase and the branching of the alkyl group strikingly lowered the mesophase thermal stabilities.