Membrane formation mechanism of cross-linked polyurea microcapsules by phase separation method

H. Yoshizawa Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Okayama 700-8530, JapanCorrespondence[email protected]

E. Kamio Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Okayama 700-8530, Japan

N. Hirabayashi Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Okayama 700-8530, Japan

J. Jacobson The Media Laboratory, Massachusetts Institute of Technology, 20 Ames Street, Cambridge, Massachusetts, USA

Y. Kitamura Department of Environmental Chemistry and Materials, Faculty of Environmental Science and Technology, Okayama University, 3-1-1 Tsushima-Naka, Okayama 700-8530, Japan

Abstract

This research was conducted to clarify the membrane formation mechanism of cross-linked polyurea microcapsules by phase separation method, especially the role of polymeric surfactant, such as poly(ethylene-alt-maleic anhydride) (poly(E-MA)) at the interface of O/W emulsion. It was found that poly(E-MA) was necessary for the formation of cross-linked polyurea membrane. The addition of sodium dodecyl sulphate (SDS) prohibited the membrane formation reaction at the interface, even in the case of poly(E-MA) concentration enough for polymeric microcapsule formation. From the results in this study, poly(E-MA) was found to be adsorbed on the O/W emulsion and provide the reaction site for the membrane formation of polymeric microcapsules.

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Membrane formation mechanism of cross-linked polyurea microcapsules by phase separation method

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Membrane formation mechanism of cross-linked polyurea microcapsules by phase separation method

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