Evaluation of substituted polycarbonates and a blend with polystyrene as gas separation membranes |
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| Affiliation: | 1. Department of Physical Chemistry and Technology of Polymers, Silesian University of Technology, Ks. M. Strzody 9, 44-100 Gliwice, Poland;2. M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of materials science and engineering, Donghua University, Shanghai 201620, China;2. School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China;1. University School of Basic & Applied Sciences, Guru Gobind Singh Indraprastha University, New Delhi 110078, India;2. Department of Physics, Aggarwal College, Ballabhgarh, Faridabad 121004, Haryana, India;1. Department of Chemistry, Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon, 24341, South Korea;2. Guangdong Research Institute of Rare-Metal, Guangdong Academy of Science, Guangzhou, 510651, China;3. Department of Materials Science and Engineering, University of Delaware, Newark, DE 19716, USA;4. Danimer Scientific, Bainbridge, GA 39818, USA |
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| Abstract: | The balance between the rate and the selectivity of transport of various gas pairs in a series of polycarbonates has been examined. Replacement of the four available hydrogens on the aromatic rings of the bisphenol-A unit with CH3, Cl, or Br groups gives materials with a better balance of these two characteristics than the unsubstituted polycarbonate (PC). For example, using CH3 substitution increases the permeability to O2 by nearly a factor of four with no loss in O2/N2 selectivity compared with PC, while using Br substitution increases O2/N2 selectivity by 50% without any loss in O2 permeability compared with PC. While these substitutions affect the permeability through both its mobility and solubility components, the remarkable selectivity effects are caused primarily by changes in relative mobility since the changes in solubility characteristics are nearly the same for all gases. These substitutions alter chain motions, cohesion, and packing as discussed. The tetramethylbisphenol-A polycarbonate forms miscible blends with polystyrene. These blends show absolute permeability coefficients which are lower than additivity while the selectivity of transport is greater. These effects are a result of the interactions between the two polymers. |
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