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Inne
Liquid-crystalline properties of 4-octyloxybenzylidene-4'-alkyloxyanilines and their mixtures with 4-pentyloxybenzylidene-4'-heptylaniline.
Autorzy
Rok wydania
2009
Czasopismo
Numer woluminu
491
Strony
71-79
DOI
10.1016/j.tca.2009.03.004
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Liquid-crystalline properties of the homologous series of 4-octyloxybenzylidene-4′-alkyloxyanilines are described. Based on the polarization microscopy (POM and TOA methods) and the calorimetric (DSC) measurements a rich polymorphism was detected. Investigated compounds exhibit nematic, smectic C, smectic I and smectic G mesophases with their characteristic configurations. The presence of all mesophases was confirmed by the miscibility method, using 4-heptyloxybenzilidene-4′-pentylaniline (I), 4-octyl-4′-decyloxyazobenzene (II) and 4-octyl-4′-undecyloxyazobenzene (III) as the mesophase standards. The influence of an alkyl chain length on the mesophase sequence and the entropic effects are extensively discussed.
Słowa kluczowe
Liquid crystals, Nematic, Smectic, Schiff base, Phase diagram, DSC, Entropy
Adres publiczny
https://doi.org/10.1016/j.tca.2009.03.004
Strona internetowa wydawcy
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