title: Blends of a Polymer of Intrinsic Microporosity and Partially Sulfonated Polyphenylenesulfone for Gas Separation.
abstract: Polyphenylenesulfone (PPSU) and sulfonated polyphenylenesulfone (sPPSU) are widely used for liquid separations in the medical and food industries. However, their potential applications for gas separation have not been studied extensively owing to their low intrinsic gas permeability. We report here for the first time that blending with sPPSU can significantly improve the gas separation performance of highly permeable polymers of intrinsic microporosity (PIMs), specifically PIM-1, because of the strong molecular interactions of the sulfonic acid groups of sPPSU with CO2 and O2 . In addition, a novel co-solvent system has been discovered to overcome the immiscibility of these polymers. The presence of a higher degree of sulfonation in sPPSU results in better gas separation performance of the blend membranes close to or above the Robeson upper bound lines for O2 /N2 , CO2 /N2 and CO2 /CH4 separations. Interestingly, the blend membranes have comparable gas selectivity to sPPSU even though their sPPSU content is only 5-20 wt %. Moreover, they also display improved anti-plasticization properties up to 30 atm (3 MPa) using a binary CO2 /CH4 feed gas. The newly developed PIM-1/sPPSU membranes are potential candidates for air separation, natural gas separation, and CO2 capture.
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585, Singapore.
authors.forename: Wai Fen
authors.initials: WF
authors.lastname: Yong
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585, Singapore.
authors.forename: Zhi Kang
authors.initials: ZK
authors.lastname: Lee
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585, Singapore. chencts@nus.edu.sg.
authors.forename: Tai-Shung
authors.initials: TS
authors.lastname: Chung
authors.affiliation: Advanced Materials and Systems Research, BASF, Carl-Bosch-Str. 38, 67056, Ludwigshafen, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Weber
authors.affiliation: Advanced Materials and Systems Research, BASF, Carl-Bosch-Str. 38, 67056, Ludwigshafen, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Staudt
authors.affiliation: Performance Materials, BASF, Carl-Bosch-Str. 38, 67056, Ludwigshafen, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Maletzko
mesh_terms: D005740:Gases / Q000737:chemistry* / Q000302:isolation & purification*; D008567:Membranes, Artificial; D008958:Models, Molecular; D008968:Molecular Conformation; D010539:Permeability; D011108:Polymers / Q000737:chemistry*; D016062:Porosity; D012997:Solvents / Q000737:chemistry; D013451:Sulfonic Acids / Q000737:chemistry*
chemical_list: D005740:Gases; D008567:Membranes, Artificial; D011108:Polymers; D012997:Solvents; D013451:Sulfonic Acids; C041325:polyphenylene sulfide
keywords: carbon dioxide; co-solvent; gas separation; plasticization; polymers