Hygrothermal effects of epoxy resin. Part I: the nature of water in epoxy

This study assesses the nature of sorbed water and the related hygrothermal effects in epoxy resins. This paper is the first of a two-paper series. Three epoxy systems, DGEBA+mPDA, TGDDM+DDS, and Fiberite 934, were used in the investigation. Water sorption was achieved by immersing the materials in distilled water at constant temperature of 45°C, 60°C, 75°C and 90°C for 1530 h. Water absorption and desorption profiles were analyzed to determine...