Tröger's base-derived dianhydride as a promising contorted building block for polyimide-based membranes for gas separation

Troger's base polymeric membranes for CO2 separation: a review

“…More recently, Abdulhamid et al 105 designed a novel TB-based dianhydride (TBDA) (shown in Fig. 8) and then yielded two TBDA-based PIs by reacting TBDA with 1,7-diamino-6 H ,12 H -5,11-methanodibenzo[1,5] diazocine-2,8-diol (HTB) and 2,3,5,6-tetramethyl- p -phenylenediamine (TMPD), named TBDA-HTB and TBDA-TMPD.…”

“…More recently, Abdulhamid et al 105 2.1.3 Other high free volume TB polymers. According to Freeman's theory, improving the rigidity of polymer chains and preventing chain stacking are effective approaches to improve the FFV and, consequently, gas permeabilities.…”

Effect of monomer moieties on the aggregate structure and gas transport properties of polyimides: Insights from experiments and simulations

“…Extensive researches have been performed to study this relationship of PIs. For example, various PIs were reported by introducing rigid twisted moieties, including spirobifluorene (SBF), 7,8 spirobisindane (SBI), 9 ethanoanthracene (EA), 10,11 Tröger's base (TB), [12][13][14] and triptycene (Trip) 15,16 into diamine or dianhydride monomers. The rigid twisted moieties improved insufficient packing of polymer chains, leading to high fractional free volume and excellent gas separation performances.…”