A 2D Graphitic‐Polytriaminopyrimidine (g‐PTAP)/Poly(ether‐block‐amide) Mixed Matrix Membrane for CO2 Separation

Poly(ether‐block‐amide)/g‐PTAP mixed matrix membranes (MMMs) were developed by incorporating different wt.% (1–10%) of a novel 2D g‐PTAP nanofiller and its effects on membrane structure and gas permeability were studied. The novel 2D material g‐PTAP was synthesized and characterized by various analytical techniques including field‐emission scanning electron microscopy (FESEM), X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and Raman spectroscopy. The fabricated MMMs were investigated to study the interaction and compatibility between Pebax and g‐PTAP. The MMMs showed an effective integration of g‐PTAP nanofiller into the Pebax matrix without affecting its thermal stability. Gas permeation experiments with MMMs showed improved CO2 permeability and selectivity (CO2/N2) upon incorporation of g‐PTAP in the Pebax polymer matrix. The maximum CO2 permeability enhancement from 82.3 to 154.6 Barrer with highest CO2/N2 selectivity from 49.5 to 83.5 were found with 2.5 wt.% of nanofiller compared to neat Pebax membranes. A 2D g‐PTAP was developed and used as filler in a Pebax polymer matrix to fabricate mixed matrix membranes (MMMs) with varying (0–10 wt.%) g‐PTAP content. The transport properties of the prepared MMMs were evaluated for the separation of CO2 from N2 and it was observed that the incorporation of g‐PTAP material in the Pebax matrix significantly increases CO2 permeability and selectivity.