Synthesis and gas permeation properties of novel spirobisindane-based polyimides of intrinsic microporosity

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

“…triptycene via TPDA [1] and ethanoanthracene [4]) in a fused-ring fashion showed significantly higher selectivities for the O 2 /N 2 and H 2 /N 2 gas pairs relative to their spiro-based analogs [5,6]. Improvements in CO 2 /CH 4 separation were primarily permeability based (selectivities less than 25).…”

“…Solution-processable polyimides of intrinsic microporosity (PIM-PIs) are an emerging class of glassy materials designed with contorted and inflexible backbones that pack inefficiently in the solid state to trap microporosity [1][2][3][4][5][6][7][8][9]. They have been tuned for highly selective and highly permeable O 2 and H 2 transport using bridged-bicyclic contortion centers, namely 9,10-diisopropyl-triptycene [1] and ethanoanthracene [4], with diamines that restrict rotation about the N-phenyl imide bond.…”

Effect of methanol treatment on gas sorption and transport behavior of intrinsically microporous polyimide membranes incorporating Tröger׳s base

“…However, the structural diversity of PIMs has been somewhat limited for several reasons including monomer availability, insufficient solubility, or the formation of insoluble polymer network products. New avenues which have been explored to improve processability include PIMs incorporating polyimide (PI) structures [21,22]. PIs are well-known and commonly used in various industrial applications due to their excellent physical properties such as thermal and chemical stabilities, good gas permeability, and good solubility in polar aprotic solvents [23,24].…”

Intrinsically Microporous Soluble Polyimides Incorporating Tröger’s Base for Membrane Gas Separation

“…Gas transport data for the two TB-based polyimide membranes are shown in Figure 5 34 and PIM-6FDA−OH, 47 and even out-performed many other reported non-6FDA PIM− PIs such as PIM−PI-1, 43 PIM−PI-3, 43 PIM−PI-9, 42 PIM−PI-10, 42 and PIM−PI-11 42 (see Figure 5), although the performance data are well below the currently reported KAUST-PI-1. 49 The significant increase in microporosity induced by the incorporation of TB units into PI gives marked gains in the gas separation performance of the membranes.…”