초록 ▼

Electrorheological systems of improved temperature range are obtained by including within the system a solid polymer insoluble in a low molecular weight activating material and in the hydrophobic medium of the fluid. The polymer contains hydrophilic functionality, and in the polymer a portion of the

Electrorheological systems of improved temperature range are obtained by including within the system a solid polymer insoluble in a low molecular weight activating material and in the hydrophobic medium of the fluid. The polymer contains hydrophilic functionality, and in the polymer a portion of the low molecular weight polar activating material is sorbed in an amount which reversibly increases with increasing temperature.

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[ What is claimed is:] [1.] An electrorheological fluid system suitable for use in an electrorheological device which comprises a fluid compartment which contains a portion of said fluid system and a pair of electrodes separated by a gap and encompassing a portion of said fluid system, said fluid sy

[ What is claimed is:] [1.] An electrorheological fluid system suitable for use in an electrorheological device which comprises a fluid compartment which contains a portion of said fluid system and a pair of electrodes separated by a gap and encompassing a portion of said fluid system, said fluid system comprising:(a) a hydrophobic liquid medium having a boiling point of at least about 150.degree. C.;(b) a dispersed particulate phase comprising an effective amount of electrorheologically active particles to exhibit electrorheological activity in the presence of an activating material;(c) an effective amount of a low molecular weight polar activating material to modify the electrorheological activity of said dispersed particulate phase; and(d) an effective amount of a solid polymer to reduce the increase in conductivity of said electrorheological fluid system at elevated temperatures, said polymer being distinct from the particles of (b), insoluble in said low molecular weight activating material and in said hydrophobic medium, containing hydrophilic functionality, and capable of sorbing an amount of said low molecular weight polar activating material which increases with increasing temperature, said sorption being at least in part reversible;wherein the polymer of (d) is in a form of one or more pieces other than particles of a dispersed particulate phase, whereby said fluid can be employed between the electrodes of said electrorheological device without passage of the pieces of polymer of (d) between said electrodes.