Han, Jun Young Lee, Ju Yeon Kim, Hyoung-Juhn Kim, Man-Ho Han, Su Gyeong Jang, Jong Hyun Cho, Eun Ae Yoo, Sung Jong Henkensmeier, Dirk 2024-01-20T09:04:52Z 2024-01-20T09:04:52Z 2021-09-05 2014-08 0021-8995 https://pubs.kist.re.kr/handle/201004/126538 The purpose of this study is to develop new cardo-polybenzimidazole (CPBI) copolymers containing cardo fluorene, with improved gas permeability, specifically oxygen permeability. The characteristics of these copolymers are investigated by Fourier transform infrared spectroscopy, nuclear magnetic resonance, H-1 and C-13), thermo-gravimetric analysis, and wide-angle X-ray diffraction. These membranes fabricated from copolymers have relatively high oxygen diffusion coefficients, determined using gas permeation. In particular, the CPBI-co91 (synthesized by using the monomers ratio containing dibenzoic acid=9 : 1) membrane have oxygen permeability coefficient (P-O2) of 10.69 Barrer, theoretical selectivity of 5.4 for oxygen to nitrogen, and O-2 diffusion coefficient of 9.64 x 10(-8) cm(2)/s. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40521. English John Wiley & Sons Inc. Synthesis and Characterization of Fluorene-Based Polybenzimidazole Copolymer for Gas Separation Article 10.1002/app.40521 1 Journal of Applied Polymer Science, v.131, no.15 Journal of Applied Polymer Science 131 15 N scie scopus 000336456400040 2-s2.0-84900486740 Polymer Science Polymer Science Article TRANSPORT PROPERTIES MEMBRANES PERMEABILITY POLYMERS HYDROGEN SORPTION copolymers membranes separation techniques