Viscoelastic Behavior and its Mechanisms of Aqueous Suspensions of Resin Particles
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概要
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Rheological properties of aqueous suspensions were investigated. Aqueous suspensions of acryl-styrene copolymer (AS) particles showed linear viscoelastic behavior. Rhelogical properties of AS suspensions were compared with those of flocculated suspensions, colloid crystals, and Brownian suspensions. Lissajous figures of AS suspension showed elliptical shape in whole measurement region, while those of flocculated suspension showed incomplete circles. Creep measurement curves indicated that AS suspensions had liquid like property while colloid crystals had solid like property. These results suggest that the viscoelastic mechanism of AS suspension is different from flocculated suspensions or colloid crystals. The ratio of the Peclet time τp to average relaxation time τw was calculated for a comparison between AS suspensions and Brownian suspensions. The volume fraction dependency of τp/τw of AS suspensions was on the same line with Brownian suspensions.<BR>This result suggests that the Brownian contribution is the origin of the linear viscoelastic behavior of aqueous suspensions of AS particles.
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