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- W2090888900 abstract "Abstract A homologous series of chiral materials, (R)-2-pentyl (S)-2-(6-(4-(4′-alkoxyphenyl)benzoyloxy)-2-naphthyl)propionates (R,S)PmPBNP (m = 7-14), derived from a naphthalene ring as part of the core structure in conjunction with a chiral tail containing two stereocentres has been synthesized for the investigation. The twist grain boundary smectic A (TGBA) and smectic C (TGB*C) phases were characterized by the microscopic textures of compounds packed in two untreated glass slides, Cano wedge cell, or homogeneously aligned cell. It was found that the occurrence of these phases depend remarkably on the nature of alkyl chain length m; in the case of shorter alkyl chain length (m = 7-10), the TGBA phase behaves as a metastable-like phase mediated between N and SA phases in a short temperature range, whereas in the longer chain length (m' 11-14), both the TGBA and TGBC phases become thermodynamically stable phases with a wide temperature range. Consequently, this series of chiral materials resulted in two different mesophase sequences: N-TGBA-SA-SCand N-TGBA-TGBC. A kind of parquet texture displaying two types of domain with different relative directions of the smectic layer normal was found in the S phase from the materials (m = 9-14) packed in 2 μm homogeneously aligned cells and cooled down from the isotropic liquid without applying an electric field. The magnitudes of spontaneous polarization (P s) in the SC and TGBC phases showed that the P s values are nearly the same for all compounds at the same temperature below the Curie point. Dielectric measurements revealed no significant occurrence of soft mode switching in the TGBA phase." @default.
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- W2090888900 date "1996-12-01" @default.
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- W2090888900 title "TGBAphase in a series of propionates containing two stereocenters" @default.
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- W2090888900 doi "https://doi.org/10.1080/02678299608032894" @default.
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