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Amide-functionalized triamine-induced network polyimides with tunable steric effects for enhanced CO2 separation and long-term stability
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DOI：10.1016/j.seppur.2026.139626.png)
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Abstract
En 中文
Network polyimides (PIs) with enhanced structural rigidity represent promising candidates for mitigating plasticization and physical aging issues commonly encountered in conventional linear polyimide membranes. In this work, two novel amide-functionalized trimesoyl chloride (TMC)-derived triamine monomers were rationally designed to construct intrinsically crosslinked network polyimide membranes with tunable steric hindrance and crosslinking density. The incorporation of methyl substituents effectively increased interchain spacing and fractional free volume, leading to significantly enhanced gas permeability. Among the prepared membranes, PI-Me-2:8 exhibited the most balanced separation performance, achieving a CO2 permeability of 169.9 Barrer with a CO2/CH4 selectivity of 30.7, surpassing the 1991 Robeson upper bound. After 180 days of physical aging, PI-2:8 retained 76.9% of its initial CO₂ permeability, showing better anti-aging performance than PI-Me-2:8. Both membranes displayed no detectable CO2-induced plasticization up to 30 bar. These findings provide an effective molecular design strategy for developing structurally durable network polyimide membranes for efficient CO2/CH4 separation.
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