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• W2077898562 endingPage "205" @default.
• W2077898562 startingPage "195" @default.
• W2077898562 abstract "A copolyamic acid was synthesized from 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) as the dianhydride and 4,4′-oxydianiline (4,4′-ODA) and 2,4-diaminotoluene (2,4-DAT) as the diamine and was coated on the outer surface of a porous alumina support tube. The film was imidized and then carbonized by varying reaction period, temperature and atmosphere. Permeances of the BPDA-ODA/DAT carbon membrane were much lower than those of BPDA-ODA carbon membranes. However, the performance of the BPDA-ODA/DAT copolyimide-based membrane was greatly improved by treating in air at temperatures up to 500°C for 1 h, followed by carbonizing in nitrogen at temperatures up to 700°C. Permeance to CO2 for the BPDA-ODA/DAT carbon membrane prepared under optimum conditions was 3 × 10−8 mol m−2 s−1 Pa−1, and the separation coefficient of CO2 to CH4 was 60 at a permeation temperature of 35°C. These were comparable to the results of carbon membranes prepared from BPDA-ODA polyimide. The micropore structure of the BPDA-ODA/DAT carbon membrane was thus successfully controlled by an optimized combination of oxidation and carbonization after imidization." @default.
• W2077898562 created "2016-06-24" @default.
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• W2077898562 date "1997-10-01" @default.
• W2077898562 modified "2023-10-12" @default.
• W2077898562 title "Carbon molecular sieve membrane formed by oxidative carbonization of a copolyimide film coated on a porous support tube" @default.
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• W2077898562 doi "https://doi.org/10.1016/s0376-7388(97)00100-2" @default.
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