Gas Separation Properties of Triptycene-Based Polyimide Membranes

Tuning Porosity in Triptycene-Poly(arylene ether)s

“…9,10 In terms of gas separations, when triptycene is introduced into a polyimide backbone, the fractional free volume and rigidity simultaneously increase, 2 resulting in enhanced gas permeability and reduced plasticization effects. 11,12 Similar improvements have been demonstrated for other polymers, as well. For example, a triptycene-based polysulfone had improved permeability, selectivity, and resistance to physical aging compared to bisphenol A-based polysulfone.…”

“…Triptycenes and related [2.2.2] and [2.2.1] bicyclic systems are configurationally rigid 3D structures that can promote a high internal free volume in polymers when they are incorporated directly within or fused to the main chain. These design principles have been leveraged to make intrinsically microporous polymers with targeted materials properties, including materials with low dielectric constants, − high fluorescence quantum yields for efficient excitonic transport, superior ion transport, , attractive properties for highly active heterogeneous catalyst supports, , and enhanced gas transport. , In terms of gas separations, when triptycene is introduced into a polyimide backbone, the fractional free volume and rigidity simultaneously increase, resulting in enhanced gas permeability and reduced plasticization effects. , Similar improvements have been demonstrated for other polymers, as well. For example, a triptycene-based polysulfone had improved permeability, selectivity, and resistance to physical aging compared to bisphenol A-based polysulfone .…”