Investigation of alternative compounds to poly(E-MA) as a polymeric surfactant for preparation of microcapsules by phase separation method.
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.
Yoshizawa
Hidekazu
H
Faculty of Environmental Science and Technology, Department of Environmental Chemistry and Materials, Okayama University, Okayama, Japan. yhide@cc.okayama-u.ac.jp
Kamio
Eiji
E
Kobayashi
Eiji
E
Jacobson
Joseph
J
Kitamura
Yoshiro
Y
D000475:Alkenes / Q000737:chemistry*; D002214:Capsules; D003432:Cross-Linking Reagents; D005557:Formaldehyde; D008299:Maleic Anhydrides / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D011108:Polymers; D012118:Resorcinols; D012995:Solubility; D013501:Surface-Active Agents / Q000737:chemistry*; D014508:Urea; D014867:Water
D000475:Alkenes; D002214:Capsules; D003432:Cross-Linking Reagents; D008299:Maleic Anhydrides; D011108:Polymers; D012118:Resorcinols; D013501:Surface-Active Agents; D014867:Water; D005557:Formaldehyde; D014508:Urea; C031389:resorcinol