The Physical Properties of a Side-Chain Type Polysiloxane Liquid-Crystalline Polymer with Electrorheological Effect

K. Tajiri Department of Applied Physics, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-01, Japan

M. Sugaya Department of Applied Physics, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-01, Japan

T. Nagaya Department of Applied Physics, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-01, Japan

H. Orihara Department of Applied Physics, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-01, Japan

Y. Ishibashi Department of Applied Physics, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-01, Japan

M. Doi Department of Applied Physics, School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-01, Japan

A. Inoue Central Laboratory, Asahi Chemical Industry Co., Ltd., 2-1 Samejima, Fuji, Shizuoka, 416, Japan

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Abstract

The fundamental physical properties of a side-chain type polysiloxane liquid crystalline polymer, which shows a large electrorheological (ER) effect when diluted with poly-dimethylsiloxane (PDMS), were investigated by means of x-ray diffraction and dielectric measurements. From the results of X-ray diffraction it was found that at about 40°C the polymer undergoes a first-order phase transition from the smectic phase to the isotropic phase. A dielectric absorption due to the δ-process was observed, the activation energy was determined to be 81kJ/mol. In addition, a relatively large conductivity was found in this polymer, the apparent activation energy of which is about 93 kJ/mol.

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The Physical Properties of a Side-Chain Type Polysiloxane Liquid-Crystalline Polymer with Electrorheological Effect

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The Physical Properties of a Side-Chain Type Polysiloxane Liquid-Crystalline Polymer with Electrorheological Effect

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