Abstract
Composite membranes were prepared by the interfacial condensation of water-soluble diamines with an organic solvent (dichloromethane)-soluble dicarbo-methoxy terephthaloyl chloride or carbomethoxy terephthaloyl chloride on top of a porous aluminum oxide support. The morphology of skin on the composite membranes is different in the two different procedures. The polyimide composite membranes with 40-times coatings provide a high gas permeation rate of oxygen and good permselectivity [α(O2/N2)]. The composite membrane with the polyimides skin at 40-times coatings had a gas permeation rate of oxygen range from 83 × 10−5 to 130 × 10−5 cm3(STP) s−1 cm−2 cmHg−1, and a permselectivity [α(O2/N2)] range of 3.57 to 5.60. The composite membrane with poly (amide-imide)s skin at 40-times coatings had a gas permeation rate of oxygen range from 102 × 10−5 to 146 × 10−5 cm3(STP) s−1 cm−2 cmHg−1, and the permselectivity (α(O2/N2)) range from 3.20 to 4.96.
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