Liquid crystalline (LC) materials are known as a homogeneous Electro-Rheological (ER) fluid. The LC cyclosiloxane derivatives using 1,3,5,7-tetramethylcyclotetrasiloxane (cyclosiloxane) as a cyclic core were newly synthesized. In addition, the alkyl chain length in the mesogens of the LC cyclosiloxanes was varied. The phase transition behavior was clarified by using a polarizing optical microscopy and a differential scanning calorimetry. The correlation between the alkyl chain length and the phase transition behavior was discussed, and their ER effect was also discussed.
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