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View Journal Article: Relation of Swelling and Tg Depression to the Apparent Free Volume of a Particle-Filled Epoxy-based Adhesive Citation: Chiang, M. Y. and Fernandez-Garcia, M. (2003). Relation of Swelling and Tg Depression to the Apparent Free Volume of a Particle-Filled Epoxy-based Adhesive. Journal of Applied Polymer Science 87 (9). 1436-1444. Collection: Polymer Publications     Attached Files Name Description MIMEType Size Downloads chiangm0103.pdf   chiangm0103.pdf application/pdf 175.59KB 0 Title Relation of Swelling and Tg Depression to the Apparent Free Volume of a Particle-Filled Epoxy-based Adhesive Author(s) Chiang, M. Y. Fernandez-Garcia, M. Keyword(s) hygrothermal aging depression of glass transition temperature swelling free volume particle-filled adhesive Abstract/Summary The effect of hygrothermal aging on a particle-filled, epoxy-based adhesive was studied using a gravimetric sorption technique. This study has explored moisture sorption characteristics as well as the associated behaviors of swelling and the depression of the glass transition temperature (Tg). We observed that the diffusion of water in this adhesive has a non-Fickian behavior, and the depression of Tg proceeds to a definite value that is independent of the final equilibrium water content of the system. Our observations suggest that water diffuses into the polymer in a dualsorption mode, in which water resides in two populations. In one population, water is considered to occupy apparent free volume of the adhesive, and the second population water infiltrates polymer structure and forms hydrogenbonded clusters. Our results show that hygrothermal aging temperature and swelling do not alter the apparent free volume of this adhesive. We conclude that the constant value of Tg depression at saturation implies that only water in the apparent free volume is responsible for the Tg depression, whereas the swelling proceeds through the formation of hydrogen bonds in the adhesive. Publisher Wiley Periodicals, Inc. Date 2003-01-01 Copyright Notice http://www.nist.gov/public_affairs/disclaim.htm Journal Journal of Applied Polymer Science Volume 87 Pages 1436-1444 Issue 9 Copyright Agreement on Additional Notes Journal of Applied Polymer Science 2003; 87(9): 1436-1444; Sponorship: The support of the Ministerio de Educacion y Cultura of Spain to M.F.-G. for this research is gratefully acknowledged.   User Comments   Created: Wed, 01 Nov 2006, 20:51:53 EST Detailed History

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