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Tuning the mesogenic properties of 5-alkoxy-2-(4-alkoxyphenyl)pyrimidine liquid crystals: the effect of a phenoxy end-group in two sterically equivalent series.
- Source :
- Liquid Crystals; Sep2014, Vol. 41 Issue 9, p1246-1260, 15p
- Publication Year :
- 2014
-
Abstract
- Two sterically equivalent series of phenoxy-terminated 5-alkoxy-2-(4-alkoxyphenyl)pyrimidine liquid crystals were synthesised, and their mesogenic properties were characterised by polarised optical microscopy and differential scanning calorimetry (DSC). The phenoxy end-group causes a significant increase in melting point and inhibits – at least partially – the mesomorphism of these materials relative to the parent isomers; in most cases, the broad enantiotropic SmC phase formed by the parent isomers is suppressed by the addition of the phenoxy end-group. However, detailed analyses by small-angle X-ray scattering and monodomain 2D X-ray scattering suggest that these compounds form a SmA phase with a partially intercalated bilayer structure in which the phenoxy end-groups are nanosegregated. Such an intercalated bilayer structure might enable the tuning of smectogenic properties by appropriate substitution of the phenoxy end-groups. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02678292
- Volume :
- 41
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Liquid Crystals
- Publication Type :
- Academic Journal
- Accession number :
- 96936244
- Full Text :
- https://doi.org/10.1080/02678292.2014.913721