Gas permeation properties of a composite membrane filled with poly(ethylene oxide) into a porous membrane

✍ Scribed by Kimiaki Tsutsui; Hiroaki Yoshimizu; Yoshiharu Tsujita; Takatoshi Kinoshita

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 120 KB
• Volume: 73
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19990923)73:13<2733::aid-app21>3.0.co;2-o

✦ Synopsis

The permeability coefficients of O 2 , N 2 , and CO 2 gases at 25°C were examined for composite membranes that were prepared by filling poly(ethylene oxide)(PEO) with different molecular weights into a porous membrane. The permeability coefficients of O 2 , N 2 , and CO 2 were 2 ϫ 10 Ϫ10 -4 ϫ 10 Ϫ10 , 5 ϫ 10 Ϫ11 -9.5 ϫ 10 Ϫ11 , and 6 ϫ 10 Ϫ10 -1 ϫ 10 Ϫ9 (cm 3 STPcm/cm 2 s cmHg), respectively. The higher permeability coefficients of CO 2 are explained in terms of high solubility of CO 2 in filled PEO. The permeability coefficient of CO 2 was affected by the degree of crystallinity of PEO in the composite. On the other hand, there was little effect of crystallinity on O 2 and N 2 permeability coefficients. Some probable relationships between selectivities of O 2 to N 2 and CO 2 to N 2 and the degree of crystallinity of PEO were observed. The CO 2 gas permeability coefficients of the composite membrane for PEO50000 (M w ϭ 5 ϫ 10 4 ) showed a marked change due to melting or crystallization of PEO.