The Effect of Hydrothermal Aging on Swelling and Tg Depression for a Particle-Filled, Epoxy-Based Adhesive
Martin Y. Chiang, K T. Faber, M Fernandez-Garcia
The aim of this experimental investigation was to determine the effectof moisture on he physical properties of a particle-filled adhesive for structural bonding applications (weld-bond). This study has explored moisture effect on he behaviors of swelling and the depression of the glass transition temperature (Tg). The swelling and Tg depression are related to the free volume of the adhesive. The results suggest that the free volume is the determining factor for the depression of Tg, and that swelling does not alter the free volume of the adhesive system. Consequently, the depression of Tg proceeds to a definite value which is governed by water trapped in free volume, but is independent of the final equilibrium water content of the system. The results also suggests that the swelling due to water uptake proceeds through the statge of water cluster formation in the adhesive.
free volume, hygrothermal aging, swelling, the depression of glass transition tempe
, Faber, K.
and Fernandez-Garcia, M.
The Effect of Hydrothermal Aging on Swelling and Tg Depression for a Particle-Filled, Epoxy-Based Adhesive, Adhesion Society, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851562
(Accessed December 8, 2023)