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Effect of spacer length on mesomorphic behaviours of chiral liquid crystal compounds containing (-)-menthyl.
- Source :
-
Liquid Crystals . Sep2018, Vol. 45 Issue 12, p1760-1770. 11p. - Publication Year :
- 2018
-
Abstract
- A homologous series of new chiral liquid crystal compounds, MnBEB (n = 4-10), was prepared by covalently linking a chiral (-)-menthyl with biphenyl-benzoate via a dicarboxylic spacer of varying length and parity. A combination of analysis methods, such as FT-IR, 1H NMR spectra, differential scanning calorimetry (DSC), polarised optical microscopy (POM) and X-ray diffraction was carried out to systematically investigate their phase structures and phase transition behaviours. The length and parity of the flexible spacers has a profound influence on the Tm and Tc and a modest odd-even effect is observed for the chiral liquid crystal compounds MnBEB. Only compound M4BEB developed an N* phase with selectively reflection on heating and a blue phase on cooling process. In addition, increasing the length of the flexible spacers tends to narrow the temperature range of the N* phase and widen the smectic phase, moreover, the pitch becomes longer with the spacer increases. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02678292
- Volume :
- 45
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Liquid Crystals
- Publication Type :
- Academic Journal
- Accession number :
- 133199584
- Full Text :
- https://doi.org/10.1080/02678292.2018.1485978