Thermally stable cross-linked P84 with superior membrane H2/CO2 separation properties at 100 °C
- Univ. at Buffalo, NY (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
Polymers with a strong size-sieving ability and superior H2/CO2 selectivity at 100 °C or above are of great interests for pre-combustion CO2 capture. 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 °C. As such, herein we demonstrate that commercial P84™ can be chemically cross-linked using 1,4-butanediamine (BuDA) to achieve robust H2/CO2 separation properties at 100–150 °C. 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 effects 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 cross-linked by BuDA for 6 h exhibits a H2 permeability of 47 Barrers (1 Barrer = 3.35 × 10–16 mol m/m2 s Pa) and H2/CO2 selectivity of 14 at 100 °C, which is on the Robeson's upper bound, indicating their potential for practical applications.
- Research Organization:
- Univ. at Buffalo, NY (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy (FE); National Science Foundation (NSF)
- Grant/Contract Number:
- FE0026463; 1554236
- OSTI ID:
- 1659661
- Journal Information:
- Journal of Membrane Science, Vol. 575; ISSN 0376-7388
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Fabrication of Defect-Free P84® Polyimide Hollow Fiber for Gas Separation: Pathway to Formation of Optimized Structure
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journal | December 2019 |
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