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Thermally stable cross-linked P84 with Superior Membrane H2/CO2 separation properties at 100 oC

Published

Author(s)

Maryam Omidvar, Christopher M. Stafford, Haiqing Lin

Abstract

Polymers with a strong size-sieving ability and superior H2/CO2 selectivity are of great interests for pre-combustion CO2 capture at 100 oC or above. Polyimides (such as Matrimid and 6FDA-durene) have been cross-linked using diamines and show superior H2/CO2 selectivity. However, these cross-linked polymers cannot be used for the pre-combustion CO2 capture because of the lack of thermal stability at 100 oC. Herein we demonstrate that commercial P84TM can be chemically cross-linked using 1,4-butanediamine (BuDA) to achieve robust H2/CO2 separation properties at 100 - 150 oC. The cross-linked P84 were thoroughly evaluated using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The effect of the cross- linking time on the physical properties and H2/CO2 separation properties at various temperatures were determined and interpreted using a free volume model. An exemplary sample based on P84 crosslinked by BuDA for 6 h exhibits a H2 permeability of 28 Barrers (1 Barrer = 3.35 × 10-16 mol m/m2·s·Pa) and H2/CO2 selectivity of 14 at 100 oC, which is on the Robeson’s upper bound, indicating their potential for practical application.
Citation
Journal of Membrane Science
Volume
575

Keywords

polyimide, membranes, crosslinking, separation, diamine
Created January 6, 2019, Updated May 30, 2019