バリウムフェライト磁性塗料の粘弾性
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概要
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The viscoelastic properties of a suspension of barium ferrite particles in silicone oil was investigated. The effects of flocculated structure, formed by dispersed particles, on the rheological properties were discussed. In order to investigate non-linear viscoelastic properties of concentrated suspension precisely, a computer-controlled rheometer was constructed using Megatorque Moter. Various modes of rheological measurements were performed, such as stress overshoot phenomenon after sudden initiation of shear flow, steady shear viscosity at various shearing conditions, and dynamic viscoelastic properties.<BR>Peculiar time-dependent phenomena associated with formation and breakdown of the network structure formed by magnetic particles were observed. From the stress overshoot experiments the growth of structural networks was evaluated quantitatively. The dependence of standing time on viscoelastic properties for suspensions of Ba-ferrite was less clear than that of γ-Fe<SUB>2</SUB>O<SUB>3</SUB>. In the frequency dependence of the storage modulus, the value is almost constant in the low-freqeuncy region and decreases with increasing shear strain due to the reduction of the structural density of interpatricle networks. In strain sweep experiment concerning the dynamic viscosity, the value takes a maximum tentatively prior to decrease, because the rupture of the interparticle networks causes an increase in the internal friction. The dependence of the viscosity on the amplitude is rather mild comparing with that of storage modulus.
- 色材協会の論文
色材協会 | 論文
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