Humidity-responsive polymeric films based on AOT - Water reverse microemulsions

Jolanta E. Marszalek
John A. Pojman
Kayce Leard Aultman
Charles E. Hoyle

Abstract

Hydrophobic polymer films, having an aqueous phase distributed throughout the matrix, were formed by polymerizing a solution of dodecyl acrylate and 1,6 hexanediol diacrylate containing nanometer-sized drops of water stabilized by sodium bis(2-ethylhexyl) sulfosuccinate (ACT). Photopolymerization-incluced aggregation of the water drops and/or phase separation occurred, as the initially clear solutions became opaque films. The polymerized films became clear, as the relative humidity was reduced. Clear films still contained 20-50% of the initial water. The transition from opaque to clear films was reversible provided that the film did not become completely dry and form cracks. (c) 2007 Wiley Periodicals, Inc.