Abstract: Aheterogeneous transport model for the diffusion of ethanol in epoxy resin(epoxy)/urethane acrylate resin(UAR) SINfilms has been established. The experimental results show that over the mass composition ratio range of epoxy and UARfrom 100/0 to 50/50, the SINs exhibit the clear phase separation morphology and the absorption curves measured can be correlated well enough with such a heterogeous transport model. The correlating factor Ψ is expressed as the degree of dispersion for the dispersion phase. With the increase of UARcontent in SIN, factor Ψ increases, which shows the increase of the degree of dispersion of UARnetwork in epoxy continuous phase as consistent with the TEMobservation. The SINwith the mass composition ratio of 50/50 shows a dual continuous morphology, and its correlating factor Ψ increases appreciably.

Key words: Ethanol, Urethane acrylate resin, Epoxy resin, Interpenetrating polymer network, Absorption, Diffusion