Pristine and thermally-rearranged gas separation membranes from novel o-hydroxyl-functionalized spirobifluorene-based polyimides
Type
ArticleKAUST Department
Advanced Membranes and Porous Materials Research CenterChemical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2014-09-22Permanent link to this record
http://hdl.handle.net/10754/563261
Metadata
Show full item recordAbstract
A novel o-hydroxyl-functionalized spirobifluorene-based diamine monomer, 2,2′-dihydroxyl-9,9′-spiro-bifluorene- 3,3′-diamine (HSBF), was successfully prepared by a universal synthetic method. Two o-hydroxyl-containing polyimides, denoted as 6FDA-HSBF and SPDA-HSBF, were synthesized and characterized. The BET surface areas of 6FDA-HSBF and SPDA-HSBF are 70 and 464 m2 g-1, respectively. To date, SPDA-HSBF exhibits the highest CO2 permeability (568 Barrer) among all hydroxyl-containing polyimides. The HSBF-based polyimides exhibited higher CO2/CH4 selectivity than their spirobifluorene (SBF) analogues (42 for 6FDA-HSBF vs. 27 for 6FDA-SBF) due to an increase in their diffusivity selectivity. Polybenzoxazole (PBO) membranes obtained from HSBF-based polyimide precursors by thermal rearrangement showed enhanced permeability but at the cost of significantly decreased selectivity.Citation
Ma, X., Salinas, O., Litwiller, E., & Pinnau, I. (2014). Pristine and thermally-rearranged gas separation membranes from novel o-hydroxyl-functionalized spirobifluorene-based polyimides. Polym. Chem., 5(24), 6914–6922. doi:10.1039/c4py01221fSponsors
The authors acknowledge KAUST funding for Professor Ingo Pinnau.Publisher
Royal Society of Chemistry (RSC)Journal
Polym. Chem.ae974a485f413a2113503eed53cd6c53
10.1039/c4py01221f