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KMID : 0604520050310020135
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Journal of the Society of Cosmetic Scientists of Korea
2005 Volume.31 No. 2 p.135 ~ p.140
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The Rheological Behaviors of Solid-Liquid Transfer Emulsion
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Park Byung-Kyu
Han Jong-Sub
Lee Sang-Min
Lee Cheon-Koo
Yoon Myung-Seok
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Abstract
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A solid state emulsion haying high velocity gradient shows two important transition ranges in the plot of storage modulus(G’’) as a function of shear strain, when the state is changed from solid to liquid. However, a solid state emulsion having low velocity gradient shows only one apparent transition range when the change from solid to liquid state takes place. The result implies the importance of the surface properties in the solid state emulsion. The addition of water phase in the solid state emulsion reduces the modulus in the modulus in the surface transition range by increasing interfacial friction and weakening the matrix. The addition of pigments increases the modulus in the modulus in the surface transition range by reinforcing the matrix, when there is no wafer phase in the solid state emulsion. When the solid state emulsion has water phase, however, the addition of pigments decreases the modulus in the modulus in the surface transition range.
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KEYWORD
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emulsion, rheology, modulus, velocity gradient, surface transition
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