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. 2019 Nov 4;11(11):1807.
doi: 10.3390/polym11111807.

Effect of a Different Number of Amine-Functional Groups on the Gas Sorption and Permeation Behavior of a Hybrid Membrane Comprising of Impregnated Linde T and 4,4'- (Hexafluoroisopropylidene) Diphthalic Anhydride-Derived Polyimide

Norwahyu Jusoh  1 , Yin Fong Yeong  2 , Serene Sow Mun Lock  3   4 , Noorfidza Yub Harun  5 , Mohd Hizami Mohd Yusoff  6
Affiliations

Effect of a Different Number of Amine-Functional Groups on the Gas Sorption and Permeation Behavior of a Hybrid Membrane Comprising of Impregnated Linde T and 4,4'- (Hexafluoroisopropylidene) Diphthalic Anhydride-Derived Polyimide

Norwahyu Jusoh et al. Polymers (Basel). .

Abstract

The bottleneck of conventional polymeric membranes applied in industry has a tradeoff between permeability and selectivity that deters its widespread expansion. This can be circumvented through a hybrid membrane that utilizes the advantages of inorganic and polymer materials to improve the gas separation performance. The approach can be further enhanced through the incorporation of amine-impregnated fillers that has the potential to minimize defects while simultaneously enhancing gas affinity. An innovative combination between impregnated Linde T with different numbers of amine-functional groups (i.e., monoamine, diamine, and triamine) and 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA)-derived polyimide has been elucidated to explore its potential in CO2/CH4 separation. Detailed physical properties (i.e., free volume and glass transition temperature) and gas transport behavior (i.e., solubility, permeability, and diffusivity) of the fabricated membranes have been examined to unveil the effect of different numbers of amine-functional groups in Linde T fillers. It was found that a hybrid membrane impregnated with Linde T using a diamine functional group demonstrated the highest improvement compared to a pristine polyimide with 3.75- and 1.75-fold enhancements in CO2/CH4 selectivities and CO2 permeability, respectively, which successfully lies on the 2008 Robeson's upper bound. The novel coupling of diamine-impregnated Linde T and 6FDA-derived polyimide is a promising candidate for application in large-scale CO2 removal processes.

Keywords: 6FDA-derived polyimide; CO2/CH4 separation; Impregnated Linde T; hybrid membrane; sorption.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
The chemical structures of 6FDA-derived polyimide, Linde T, and amine-functionalization groups, including monoamine (APTMS), diamine (AAPTMS), and triamine (AEPTMS) functional groups, adapted from Nafisi & Hägg (2014) and Huh et al. (2003) [40,41].
Figure 2
Figure 2
Amine functionalization agent reaction mechanism with 6FDA-derived polyimide and Linde T particles, adapted from Wahab et al. (2008) [43].
Figure 3
Figure 3
Cross-section images of (a) pure 6FDA-derived polyimide membrane, and impregnated Linde T (b) M1 (c) M2, and (d) M3 hybrid membranes.
Figure 4
Figure 4
EDX-mapping images of (a) pure 6FDA-derived polyimide membrane, and impregnated Linde T (b) M1 (c) M2, and (d) M3 hybrid membranes.
Figure 5
Figure 5
Sorption isotherms of pure 6FDA-derived polyimide and impregnated Linde T hybrid membranes including M1, M2, and M3 membranes at 30 °C.
Figure 6
Figure 6
Intramolecular catalysis of amine-functionalization agents including APTMS (monomine), AAPTMS (diamine), and AEPTMS (triamine), adapted from Zhu et al. (2012) [56].
Figure 7
Figure 7
Gas separation performance of membranes fabricated in the present work compared with Robeson’s upper bound.
See this image and copyright information in PMC

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