Effects of hydroxyl-functionalization and sub-Tg thermal annealing on high pressure pure- and mixed-gas CO2/CH4 separation by polyimide membranes based on 6FDA and triptycene-containing dianhydrides

• Published in: Journal of membrane science Vol. 475 p.571-581; pp. 571 - 581
• Main Authors: Swaidan, Raja, Ghanem, Bader, Litwiller, Eric, Pinnau, I
• Format: Journal Article
• Language: English
• Published: 01.02.2015
• Subjects: adsorption; annealing; artificial membranes; carbon dioxide; cellulose acetate; fluorescence; heat; methane; microstructure; natural gas; permeability; polymers; sieving; solubility

A sub-Tg thermally-annealed (250°C, 24h) ultra-microporous PIM-polyimide bearing a 9,10-diisopropyl-triptycene contortion center and hydroxyl-functionalized diamine (2,2-bis(3-amino-4-hydroxyphenyl)-hexafluoropropane, APAF) exhibited plasticization resistance up to 50bar for a 1:1 CO2/CH4 feed mixtu...