Investigation of alternative compounds to poly(E-MA) as a polymeric surfactant for preparation of microcapsules by phase separation method |
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| Authors: | Hidekazu Yoshizawa Eiji Kamio Eiji Kobayashi Joseph Jacobson Yoshiro Kitamura |
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| Affiliation: | 1. Faculty of Environmental Science and Technology, Department of Environmental Chemistry and Materials, Okayama University, Okayama, Japan;2. The Media Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA |
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| Abstract: | ![]()
Various water-soluble polymers were used to examine an alternative emulsifier for poly(ethylene-alt-maleic anhydride), used in the preparation of crosslinked polyurea microcapsules. Microcapsules were successfully prepared by using the water-soluble polymers with large molecular weight alternating copolymers, namely poly(olefin-maleic anhydride), poly(olefin-maleic acid), and poly(acrylic acid). On the other hand, no microcapsule resulted from olefin-maleic acid with small molecular weight alternating copolymers. From these results, the following guidelines were obtained for the selection of polymeric surfactants suitable for crosslinked polyurea microcapsule. A polymeric surfactant must have maleic acid or a carboxyl group in order to form a crosslinked polyurea microcapsule membrane. Furthermore, to form a stronger capsule membrane it is desirable to have a maleic anhydride group. It is also important for membrane formation that the polymeric surfactant has a suitable molecular weight. |
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| Keywords: | Crosslinked polyurea microcapsule polymeric surfactant olefin-maleic anhydride alternating copolymers maleic anhydride group |
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