CO2 Permeation and Diffusion Properties of Semicrystalline Poly(4-methyl pentene-1) Membranes

Abstract

CO2 permeation and diffusion behaviors of poly(4-methyl pentene-1) (PMP) with three different degrees of crystallinity were examined at −10 to 45°C. Permeation and diffusion coefficients in crystalline and amorphous parts of PMP were obtained by an extrapolation to 100 and 0% degrees of crystallinity, respectively. The inflection corresponding to the glass transition temperature of PMP was observed in Arrhenius plot of both the permeability and diffusion coefficients only for the amorphous part of PMP. The non zero values of permeation and diffusion coefficients of crystalline part of PMP indicated that the permeation and diffusion of CO2 occurred even in the crystalline part of PMP. The permeation and diffusion of CO2 for the crystalline part of PMP were Arrhenius type within experimental scatter.