Effect of Hygrothermal Aging History on Sorption Process, Swelling, and Glass Transition Temperature in a Particle-Filled Epoxy-Based Adhesive
M Fernandez-Garcia, Martin Y. Chiang
The effects of hygrothermal aging history and initial water content on sorption behavior and the physical properties of a commercial particle-filled, epoxy-based adhesive were studied using a water reabsorption process. FTIR-AR analysis was performed to characterize the hydrogen bond interactions among the water, resin and fillers. Swelling behavior and the depression of the glass transition temperature (Tg) under different hygrothermal aging histories were related to the water in the apparent free volume of the adhesive. The results show that the water diffusion of the adhesive is a non-Fickian process regardless of hygrothermal-aging history and initial water content. It is also observed that swelling (which is reversible and consistent with water cluster formation) and the rate of diffusion are not only dependent on the hygrothermal temperature but also the hygrothermal history. In addition, the swelling observed by the reabsorption process does not alter the apparent free volume of this adhesive system, and Tg depression is independent of the final equilibrium water content of the system. These results are consistent with those in our previous paper, in that the water contained in the apparent free volume of this adhesive is the determining factor for the Tg depression.
and Chiang, M.
Effect of Hygrothermal Aging History on Sorption Process, Swelling, and Glass Transition Temperature in a Particle-Filled Epoxy-Based Adhesive, Journal of Applied Polymer Science, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851682
(Accessed June 7, 2023)