Super Case II Transport of Organic Vapors in Glassy Polymers

摘要: Alfrey, Turner, and Lloyd have defined Fickian transport Case II as the two limiting cases for transort of an organic penetrant through amorphous glassy polymer.1 refers to interdiffusion polymer described by Fick’s equations. In general, diffusion is only observed in systems when penetrants are simple gases, solvents with small molecular diameters, or partial at very low temperatures activities. At activities where swell polymer, often controlled a combination relaxation mechanisms. occurs sorption entirely stress-induced relaxations taking place sharp boundary separating outer swollen shell, essentially equilibrium concentration, from unpenetrated core. Ideally, this moves constant velocity during transport.