Intrinsically microporous polyimides containing spirobisindane and phenazine units: synthesis, characterization and gas permeation properties
| Title | Intrinsically microporous polyimides containing spirobisindane and phenazine units: synthesis, characterization and gas permeation properties |
| Publication Type | Journal Article |
| Year of Publication | 2018 |
| Authors | Shrimant, B, Dangat, Y, Kharul, UK, Wadgaonkar, PP |
| Journal | Journal of Polymer Science Part A - Polymer Chemistry |
| Volume | 56 |
| Pagination | 766-775 |
| Date Published | APR |
| ISSN | 0887-624X |
| Keywords | Gas permeability, intrinsic microporosity, polyimides, spirobisindane |
| Abstract | A new diamine containing spirobisindane and phenazine units, namely, 3,3,3,3-tetramethyl-2,2,3,3-tetrahydro-1,1-spirobi[cyclopenta[b]phen azine]-7,7-diamine (TTSBIDA) was synthesized starting from commercially available 5,5,6,6-tetrahydroxy-3,3,3,3-tetramethyl-1,1-spirobisindane (TTSBI). TTSBI was oxidized to 3,3,3,3-tetramethyl-2,2,3,3-tetrahydro-1,1-spirobi[indene]-5,5,6,6-tet raone (TTSBIQ) which was subsequently condensed with 4-nitro-1,2-phenylenediamine to obtain 3,3,3,3-tetramethyl-7,7-dinitro-2,2,3,3-tetrahydro-1,1-spirobi[cyclope nta[b]phenazine] (TTSBIDN). TTSBIDN was converted into TTSBIDA by reduction of the nitro groups using hydrazine hydrate in the presence of Pd/C as the catalyst. A series of new polyimides of intrinsic microporosity (PIM-PIs) were synthesized by polycondensation of TTSBIDA with commercially available aromatic dianhydrides. PIM-PIs exhibited amorphous nature, high thermal stability (T-10>480 degrees C) and intrinsic microporosity (BET surface area=59-289 m(2)/g). The gas permeation characteristics of films of selected PIM-PIs were evaluated and they exhibited appreciable gas permeability as well as high selectivity. The CO2 and O-2 permeability of PIM-PIs were in the range 185.4-39.2 and 30.6-6.2 Barrer, respectively. Notably, polyimide derived from TTSBIDA and 4,4-(hexafluoroisopropylidene)diphthalic anhydride (PIM-PI-6FDA) exhibited high CO2 and O-2 permeability of 185.4 and 30.6 Barrer with CO2/CH4 and O-2/N-2 selectivity of 43.1 and 5.1, respectively. The data of PIM-PI-6FDA for CO2/CH4 and O-2/N-2 gas pairs were located near Robeson upper bound. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 766-775 |
| DOI | 10.1002/pola.28950 |
| Type of Journal (Indian or Foreign) | Foreign |
| Impact Factor (IF) | 2.952 |
Divison category:
Polymer Science & Engineering
Add new comment