Gas separation properties of new polyoxadiazole and polytriazole membranes |
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| Affiliation: | 1. Instituto de Macromolécules, Universidade do Rio de Ilha do Funao, Centro de Tecnologia, CEP 21945, Rio de Janeiro, Brasil;1. Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden;2. Wallenberg Wood Science Center, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden;3. Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;4. Wallenberg Wood Science Center, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden;1. Department of Chemistry, Winston-Salem State University, Winston-Salem, NC 27110, USA;2. Department of Chemistry, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia;1. Karlsruhe Institute of Technology, Institute for Applied Materials, Association KIT-EURATOM, P.O. Box 3640, D-76021 Karlsruhe, Germany;2. Japan Atomic Energy Agency (JAEA), Plasma Heating Technology Group, 801-1 Mukoyama, Naka, Ibaraki 311-0193, Japan;1. College of Chemistry and Chemical Engineering, Fujian Normal University, Fuzhou, Fujian 350108,China;2. Department of Gynaecological Oncology, Fujian provincial Cancer Hospital, Fuzhou, Fujian 350002, China;3. Nuclear Medicine Department, The Affiliated People’s Hospital of Fujian University of Traditional Chinese Medicine, Fuzhou, Fujian 350002, China |
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| Abstract: | The gas separation properties of new aromatic poly-1,2,4-triazole and poly-1,3,4-oxadiazole membranes have been systematically investigated. Various functional groups were incorporated as pendent groups onto the polymer backbone of poly-1,2,4-triazoles. A wide permeability/selectivity spectrum was covered with the choice of functional groups incorporated into the polymer backbone of poly-1,3,4-oxadiazoles. High permeabilities were found for poly-1,3,4-oxadiazoles with a 1,1,3-trimethyl-3-phenylindane (PIDA-POD) and a 4,4′(2,2′-diphenyl)hexafluor propane (HF-POD) unit in the polymer backbone, while incorporation of a 4,4′-diphenyl ether unit (DPE-POD) results in a polymer with a low permeability but an extremely high selectivity. While the permeabilities vary over four orders of magnitude, the solubility remains almost constant and, therefore, the increase in permeability is mainly due to an increase in diffusivity. The permeability is discussed in terms of the polymer free volume. |
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