| 摘要 |
PURPOSE:To provide an electroviscous fluid of quick response, a homogeneous system free from sedimentation and separation, reduced in basal vicosity without impairing its excellent electroviscous effect, consisting mainly of a side chain- type compound of liquid crystal nature having siloxane linkage-contg. spacer. CONSTITUTION:The electroviscous fluid consisting mainly of side chain-type compound of liquid crystal nature having siloxane linkage-contg. spacer. The above-mentioned compound of liquid crystal nature is e.g. a side chain-type liquid crystal compound of formula I (m/n is 1 or 4), which can be obtained, for example, by the following process: a compound of formula II, a reaction product from p-hydroxybenzoic acid and allyl bromide, is made to react with thionyl chloride to produce an acid chloride, which is then made to react with p-cyanophenol to obtain a compound of liquid crystal nature of formula III, which is then made to react with dimethylethoxysilane followed by treatment with potassium carbonate, and the resultant reaction product is made to react with allyl dimethylchlorosilane to obtain a compound of liquid crystal nature of formula IV, which is then made to react with a copolymer silicone of formula. |
