Gas Permeation Characteristics in Polyarylate/Poly(butylene terephthalate) Blend Membranes

Shin JW; Kim HJ; Jo WH; Hong JM; Jung B; Kang YS

Korea Polymer Journal, Vol.3, No.2, 65-70, October, 1995

Shin JW, Kim HJ, Jo WH, Hong JM, Jung B, Kang YS

The permeation properties of oxygen and nitrogen in polyarylate (PAR)/poly(butylene terephthalate)(PBT) blend membranes were investigated and analyzed by using a modified two-phase model. PAR and PBT are amorphous and semi-crystalline polymers, respectively, and the amorphous phases of these polymers form a miscible blend. When blended, these two polymers show a volume contraction. the effect of crystallinity on gas permeation and separation properties was also examined. The crystallinity was controlled by annealing and/or by varying its PBT content. The resulting gas permeation characteristics were analyzed by using the modified two-phase model, derived from the semi-logarithmic additive rule. The experimental permeability in the amorphous phase of the blend showed a marginally negative deviation from the model. The deviation may be attributable to the volume change during blending.

[References]

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