Abstract
ABSTRACTIn this article, we report on the liquid-crystalline properties of the 4-ω-alkenyloxy-4′-cyanobiphenyl series of compounds up to a total aliphatic chain length of eleven. When compared to the analogous fully saturated compounds, we find that the smectic layer spacing is significantly larger for the alkene-terminated materials; conversely the dielectric anisotropy in the nematic phase was found to be significantly smaller. The ability to manipulate bulk properties of nematic and smectic mesophases may have future relevance for display applications.
Highlights
The elucidation of structure–property relationships for mesogenic materials continues to be an important avenue in applied liquid crystal research [1,2,3]
The transition temperatures of compounds 1–9 were determined by a combination of polarised optical microscopy (POM) and differential scanning calorimetry (DSC), with associated enthalpies and entropies of transition measured by DSC
The d/l ratio measured for 10OCB and 11OCB are approximately equivalent at a given reduced temperature, those for the analogous alkene terminated materials exhibit significant differences
Summary
The elucidation of structure–property relationships for mesogenic materials continues to be an important avenue in applied liquid crystal research [1,2,3]. Small angle X-ray scattering (SAXS) was used to measure the smectic layer spacing of compounds 8 and 9 along with their saturated analogues (10OCB and 11OCB) as a function of reduced temperature.
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