Gas and Water Transport Properties of Epoxy-Amine Networks: Influence of Crosslink Density

摘要

The gas and water transport properties were studied on seven epoxy-amine networks that differ by their di/mono epoxy composition and their cure cycle. The characteristic parameters of transport M_infinity and D were determined in each cae, and they show that the solubility and diffusion coefficients are influenced by their composition. The solubility increases with the extend of cure and with the decrease of dangling chains, and in both cases the evolution of the diffusivity is inverse. The variations of the solubility and diffusivity have been discussed as a function of two parameters: polar groups and unrelaxed holes of the glassy networks.