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KMID : 0604520050310010085
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Journal of the Society of Cosmetic Scientists of Korea
2005 Volume.31 No. 1 p.85 ~ p.89
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Effect of Rheological Properties on the Sedimentation of Capsules in an Aqueous Polymer Solution
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Kim Dong-Joo
Kim Jung-A
Kyung Ki-Yeol
Yoon Myung-Seok
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Abstract
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An aim of this study is to study the correlation between rheological properties and sedimentation of capsules in aqueous polymer solution with low viscosity. Rheological properties of aqueous polymer solutions were controlled by carbomer (C), acylate/C10-30 alkyl acylate crosspolymer (AC), and ammonium acryloyldimethyltaurate/VP copolymer (AV). Small amount of polymer C solution had the highest viscosity and yield stress of polymer AV solution was higher than that of polymer C solution in the same viscosity when the concentration of polymer AV exceeded 0.35 wt%. Each aqueous polymer solution was tested and the results showed that as viscosity and yield stress increased, the sedimentation ratio of capsules decreased. The viscoelasticity data also showed the same tendency in a shear stress range of 0.1 to 2.0 Pa. These results demonstrated that the rheological properties of polymer solutions had a strong correlation with the sedimentation of capsules. When polymer I and AV were used, there was a synergistic effect and the correlation between rheological properties and sedimentation of capsules was very complicated. It was assumed that the characteristics of polymer structure and interaction between polymers caused this phenomena.
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KEYWORD
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capsule, sedimentation, rheology, polymer, correlation
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