Synthesis and characterization of crosslinked porphyrin-based polyimides from different terminal alkynyl groups for carbon dioxide adsorption and separation
writer：關紹巍
keywords：交聯(lián)反應，多孔結構
source：期刊
Issue time：2019年
We fabricated three crosslinked
porphyrin-based polyimides (PPBPI-CRs) from PEPHQDA, TAPP and three terminal anhydrides (PA,
PEPA and PENA) via alkynyl groups crosslinking
reactions. PPBPI-CRs had permanent porosities and
revealed outstanding thermal stabilities. Affected by π-stacking
and molecular sizes effect, with increasing conjugate and molecular sizes
effect in different terminal anhydrides, porphyrin-based polyimides (PPBPIs) revealed
decreased specific surface areas (106.8 – 8.3 m2 g-1),
whereas, PPBPI-CRs showed increased BET surface areas (1.8
- 633 m2 g-1). Meanwhile, PPBPI-CRs had considerable CO2 uptakes (1.37,
2.01 and 2.37 mmol g-1) and isosteric heats of CO2
adsorption (34.8, 27.5 and 22.6 kJ/mol). The PPBPI-CRs had CO2/N2 (39.83, 36.95,
40.08) and CO2/CH4 (14.13, 9.78, 10.87) separation selectivities.