Permeation of liquid water in a filled epoxy resin

Publisher Website
Google Scholar
Abstract
Certain epoxy paints and filled resins were shown to be potentially useful protective coatings for concrete exposed to hot saline media. Since, however, very little information was available about water‐polymer interactions at elevated temperatures, a study of permeation and of dielectric and mechanical relaxation was begun. In this part of the study, the permeation of liquid water through an epoxy film (filled with 0, 10, and 20 wt.‐% spherical glass beads) was measured at temperatures up to 130°CC. As expected, the filler served to decrease permeation, though to a greater extent than predicted. Arrhenius plots of permeation revealed several other characteristics. In general a discontinuity was observed at Tg, with the apparent energies of activation, Ea, being lower below Tg (4–11 kcal/mole, compared to 19–26 kcal/mole). Both the sharpness of the transition and Ea were sensitive to the history of the specimen. At elevated temperatures, the most highly filled specimen showed an additional relative decrease of permeability in comparison with other specimens. An interpretation of the data is proposed, based on segmental mobility as affected by restrictions due to the presence of filler particles.

This publication has 23 references indexed in Scilit: