Styrene-maleic acid copolymer beads and styrene-divinylbenzene beads were encapsulated with polyaniline by insitu oxidative polymerization of aniline. These beads both in unmodified and encapsulated forms were studied for their organic vapor and hydrogen adsorption behavior at 30 degrees C and reduced pressure. Enhanced adsorption of hydrogen to the extent of 4.9 mass % was observed for encapsulated styrene-maleic acid copolymer beads. (c) 2007 Wiley Periodicals, Inc.