Abstract
A new liquid crystal of a siloxane dimer with an achiral swallow-tail, C11Si2C11, was synthesized and mixed with a chiral material of 4′-(1-Butoxy-1-oxopropan-2-yloxy)biphenyl-4-yl 3-bromo- 4-[9-(1,1,2,2,3,3,3-hepta- methyltrisiloxanyl)nonyloxy) benzoate, C9SiFLC, to prepare binary mixtures for this study. The mesophases under consideration were investigated by means of polarizing microscopy (POM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and electro-optical experiments. The influence of the mixture proportion of C9SiFLC on the occurrence of the chiral smectic C (SmC*) phase was investigated. Finally, the electro-optical properties of the SmC* phase, such as the tilt angle, dielectric permittivity, and switching behavior was also measured. As a consequence, the correlation between the electro-optical properties and mixture proportion was determined.
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