Die Gaspermeabilität von Polybutylenterephthalat in der Umgebung der Einfriertemperatur

The permeability of poly(butylene terephthalate) was examined for He, Ne, Ar and CO₂ at the temperature range of 293–338 K and an upstream pressure to 1,2 bar. The energies of activation of permeation and diffusion in case of Ne, Ar and CO₂ are higher above glass transition temperature than below, while they are nearly constant in case of He. The dependence of temperature of solubility coefficients does not change at the glass transition temperature.