Water absorption isotherms for cured bisphenol A type epoxy resins: Effects of isotherm temperature and resin hardener

✍ Scribed by Bryan Ellis; H. U. Rashid

• Publisher: John Wiley and Sons
• Year: 1984
• Tongue: English
• Weight: 868 KB
• Volume: 29
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1984.070290611

✦ Synopsis

Water-sorption isotherms have been determined for some bisphenol-A-type epoxy resins cured with either 4,4'-diamino diphenyl methane (DDM), phthalic anhydride, or polyamide, Versamid 115. The absorption isotherms for the diamine-cured resin are reversible and that at 0.2"C is linear for the whole accessible range of relative pressures (0 < h < I). With increase in temperature deviations from Henry's law occur at successively lower relative pressures. It is shown that these deviations from Henry's law are related to a concentration dependence of the isosteric heat of absorption. Sorption by both the polyamide and phthalic-anhydride-cured resins is not reversible; there are weight increases following an absorption-desorption cycle.