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Synthesis and gas separation of HOF-21/Triphenylamine polyimide mixed matrix membranes.

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Title: Synthesis and gas separation of HOF-21/Triphenylamine polyimide mixed matrix membranes.
Authors: Qu, Junjie1 (AUTHOR), Mo, Junhao1 (AUTHOR), Wu, Shanshan1 (AUTHOR), Shan, Chao1 (AUTHOR), Liu, Chanjuan1 (AUTHOR) liuchanjuan@glut.edu.cn, Huang, Xiaohua1 (AUTHOR) huangxiaohua@glut.edu.cn
Source: Journal of Polymer Research. Jun2026, Vol. 33 Issue 6, p1-13. 13p.
Subjects: Separation of gases, Polyimides, Polymeric membranes, Mechanical behavior of materials, Thermal stability, Hydrogen-bonded organic frameworks
Abstract: A novel trianiline diamine monomer, 4,4'-diamino-4-(3,4,5-trimethoxy)triphenylamine (DATT), was synthesized from 3,4,5-trimethoxyaniline and 4-fluoronitrobenzene. Subsequently, a fluorinated polyimide (MTPI) bearing triphenylamine, methoxy, fluorenyl, and hexafluoroisopropylidene moieties was prepared by copolymerizing DATT with 9,9'-bis(4-amino-3-fluorophenyl)fluorene (FFDA) and 4,4'-(hexafluoroisopropylidene)phthalic anhydride (6FDA). Mixed matrix membranes (MMMs) comprising HOF-21 and MTPI were fabricated via blending with HOF-21. The resulting MMMs exhibited outstanding thermal stability (T10% > 518 ℃) and hydrophobicity (water contact angle of 82.7°-90.7°). All membranes maintained good mechanical properties, with tensile strengths exceeding 56 MPa, Young's moduli ranging from 1.045 to 1.503 GPa, and elongation at break between 5.14% and 6.77%. In terms of gas separation performance, the 4% HOF-21/MTPI membrane demonstrated high CO2 permeability (29.61 Barrer) and CO2/N2 selectivity (α = 25.32), representing improvements of 22.6% and 14.7%, respectively, compared to the substrate membrane, approaching the Robeson upper limit in 2008. Highlights: A novel diamine monomer containing triphenylamine structure was designed and synthesized. HOF-21/MTPI mixed matrix membranes were successfully prepared. The prepared mixed matrix membrane exhibits excellent gas separation performance, approaching the Robertson upper limit of 2008. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:A novel trianiline diamine monomer, 4,4'-diamino-4-(3,4,5-trimethoxy)triphenylamine (DATT), was synthesized from 3,4,5-trimethoxyaniline and 4-fluoronitrobenzene. Subsequently, a fluorinated polyimide (MTPI) bearing triphenylamine, methoxy, fluorenyl, and hexafluoroisopropylidene moieties was prepared by copolymerizing DATT with 9,9'-bis(4-amino-3-fluorophenyl)fluorene (FFDA) and 4,4'-(hexafluoroisopropylidene)phthalic anhydride (6FDA). Mixed matrix membranes (MMMs) comprising HOF-21 and MTPI were fabricated via blending with HOF-21. The resulting MMMs exhibited outstanding thermal stability (T10% > 518 ℃) and hydrophobicity (water contact angle of 82.7°-90.7°). All membranes maintained good mechanical properties, with tensile strengths exceeding 56 MPa, Young's moduli ranging from 1.045 to 1.503 GPa, and elongation at break between 5.14% and 6.77%. In terms of gas separation performance, the 4% HOF-21/MTPI membrane demonstrated high CO2 permeability (29.61 Barrer) and CO2/N2 selectivity (α = 25.32), representing improvements of 22.6% and 14.7%, respectively, compared to the substrate membrane, approaching the Robeson upper limit in 2008. Highlights: A novel diamine monomer containing triphenylamine structure was designed and synthesized. HOF-21/MTPI mixed matrix membranes were successfully prepared. The prepared mixed matrix membrane exhibits excellent gas separation performance, approaching the Robertson upper limit of 2008. [ABSTRACT FROM AUTHOR]
ISSN:10229760
DOI:10.1007/s10965-026-04942-2