Abstract: The gas permeation behavior of several new Cardo polyarylethersulfones containing different alkyl substituents on the backbone benzene rings was studied. The variation of permeation and diffusion coefficients with temperature followed Arrhenius equation within the temperature range of 30℃～100℃.The permeation coefficient increased with the rise of temperature, while the selection factor decreased correspondingly. The introduction of isopropyl groups resulted in a significant increase in gas permeation coefficient. In particular,the permeation coefficient and selection factor were found to grow simultaneously when the four hydrogen atoms per repeat unit were replaced with methyl groups.

Key words: polyarylethersulfone, membrane, gas separation