Electric-Field Response of the Structure and Rheological Property  of Silicone/Polyether Blends

Minagawa, K.; Saitoh, Koichi; Okamura, Hirokazu; Mori, Takeshi; Masuda, Seizo; Tanaka, Masami

doi:10.1142/s0217979202012530

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…section 3.2) of the LCP/DMS blend systems. The attempt to improve the response time by addition of urethane-modified polysiloxane as the third liquid component also gave similar results [83].…”

Section: Multiphase Systemsmentioning

confidence: 53%

Electro- and Magneto-Rheological Materials: Stimuli-Induced Rheological Functions

Minagawa¹,

Koyama

2005

COC

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Various materials that show reversible changes in the rheological properties in response to external stimuli, especially electric and/or magnetic fields, have attracted attention because of their possible applications to devices of transformation of electric/magnetic stimulus into mechanical (passive) force. These materials are called electrorheological (ER), magnetorheological (MR), and electromagnetorheological (EMR) materials. The field-responsive properties are regarded as 'rheological functions' induced by the field, which characterize these materials. The ER/MR materials can be classified into some types, i.e. suspensions, homogeneous or heterogeneous liquids, elastomers/gels, etc. according to the rheological characteristics in the absence and presence of the electric/magnetic fields. For each type, the field-induced rheological properties are briefly summarized, followed by some topics on the material preparation, stimuli-induced functions, and/or practical applications are exemplified. The materials chemistry, especially for organic/polymer materials, are mainly focused on here.

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Section: Multiphase Systemsmentioning

confidence: 53%

Electro- and Magneto-Rheological Materials: Stimuli-Induced Rheological Functions

Minagawa¹,

Koyama

2005

COC

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Ternary Electrorheological Fluids With Composite Particles Dispersed in Liquid Blends

Minagawa

Aoki

Mori

et al. 2006

Int. J. Mod. Phys. B

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The electrorheological (ER) properties were studied with ternary suspensions containing solid and liquid dispersoids in silicone oil (DMS). The solid dispersoid used was polyether/montmorillonite nanocomposite particles in which polyether molecules were intercalated between the layers of montmorillonite. The liquid dispersoid was urethane-modified polyether prepared from 4,4′-diphenylmethane diisocyanate (MDI) and poly(propylene glycol) (PPG). The steady shear viscosity and dynamic viscoelasticity were measured with a rotating parallel disc rheometer equipped with ER measurement system. The binary and ternary mixtures of these solid and liquid dispersoids with DMS, i.e. composite particle/DMS suspension, polyether/DMS liquid blend, and ternary blend containing both dispersoids, showed an increase of viscosity in response to an electric field (positive ER effect). The ER effect of a ternary suspension containing the particles and polyether liquids was larger than those of binary suspension or blend with one of these dispersoids. The ER effect was found to be improved by combination of the solid and liquid dispersoids, although the recovery time of viscosity after removing the electric field became rather longer, which would be due to the partly irreversible macroscopic aggregation of the dispersoids.

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Electric-Field Response of the Structure and Rheological Property of Silicone/Polyether Blends

Cited by 2 publications

References 2 publications

Electro- and Magneto-Rheological Materials: Stimuli-Induced Rheological Functions

Electro- and Magneto-Rheological Materials: Stimuli-Induced Rheological Functions

Ternary Electrorheological Fluids With Composite Particles Dispersed in Liquid Blends

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