Ultra‐Microporous Triptycene‐based Polyimide Membranes for High‐Performance Gas Separation

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

“…A limited number of PIM−PIs have been prepared to date, by conventional cycloimidization reaction either between spirobisindane-based 41−43 /ethanoanthracenebased 44 dianhydrides and aromatic diamines, or triptycenebased 45,46 /spirobisindane-based diamines 47,48 and aromatic dianhydrides, or by using triptycene-based dianhydride with aromatic diamines. 49 Without exception, all the PIM−PIs exhibited higher permeability to specific gases without greatly impairing their inherent good selectivity, and also had attractive solution-processability compared with conventional PI dense membranes. 8 Taking into consideration the above-mentioned performance advantages of microporous polyimides, incorporating TB units into polyimides are expected to provide rigid PIs with intrinsic microporosity, which we anticipated would have high permeability and good permselectivity for membrane gas separation.…”

Pure- and mixed-gas propylene/propane permeation properties of spiro- and triptycene-based microporous polyimides

“…Recently, solution-processable PIMs (ladder-type and PIM-polyimides (PIM-PIs)) have been designed and predominantly evaluated for gas/gas separations (i.e. O 2 /N 2 , H 2 /N 2 , H 2 /CH 4 , CO 2 /CH 4 ) [17][18][19][20][21][22][23][24][25]. Only a few studies on PIMs, specifically the prototypical ladder-type PIM-1, have revealed outstanding vapor/gas separation properties [26,27].…”

Gas permeation and physical aging properties of iptycene diamine-based microporous polyimides

“…One class of PIMs is based on high-free-volume aromatic polyimides (PIM-PIs) that contain rigid contortion sites either in their dianhydride and/or diamine moiety. Examples of such molecular building blocks are: (i) spirobisindane dianhydrides [7,12,13] and diamines [14,15], ethanoanthracene dianhydride [6,16], spirobifluororene dianhydride [17] and diamines [18,19], Tröger's base diamines [20][21][22], and triptycene dianhydrides [10,23] and diamines [15,24,25].…”

“…Recently developed polymers of intrinsic microporosity (PIM) have demonstrated excellent gas separation performance, often exceeding the latest 2008 upper bounds [5][6][7][8][9][10][11]. These amorphous glassy polymers are characterized by: (i) very high thermal stability; (ii) solubility in organic solvents; (iii) high BET surface area (up to ~ 1000 m 2 /g); (iv) microporosity (pore size < 20 Å) as well as ultra-microporosity (< 7 Å).…”