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Abstract
Side-chain liquid-crystalline polysiloxane derivatives possessing fluorinated mesogens that have positive dielectric-anisotropy parallel to the long axis of mesogen were synthesized to study phase-transition behavior and electrorheological (ER) effect of the polymers with a preshearing method. About 2000 Pa increments in shear stress could be obtained after preshearing as an ER effect. In addition, shear rate dependence on shear stress as a function of temperature was investigated. As a result, it was shown that the preshearing treatment with high shear rate was important to generate a larger ER effect.
ACKNOWLEDGMENT
We express our thanks to Tomonori Hanasaki (Ritsumeikan University, Japan) for valuable and fruitful discussion and Tomoki Nakano and Eigo Katsuura for the synthesis of the polymers and the measurement of the ER effect. Philippe Martinoty and Daniel Rogez (Unité Mixte de Recherche CNRS-ULP, Université Louis Pasteur, France) are also acknowledged for their partial support for differential scanning calorimetry (DSC) measurement. A High-Tech Research Center Project for Private Universities matching fund subsidy from Ministry of Education, Culture, Sport, Science, and Technology is gratefully acknowledged for partial support of this work (2006).
Notes
Note. G: glass state; SmA: smetic A; IL: isotropic liquid. The transition temperatures were determined with on-set value.