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<p>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 (<i>T</i><sub>10%</sub> &gt; 518 ℃) and hydrophobicity (water contact angle of 82.7°-90.7°). All membranes maintained good mechanical properties, with tensile strengths exceeding 56&#xa0;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 CO<sub>2</sub> permeability (29.61 Barrer) and CO<sub>2</sub>/N<sub>2</sub> 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.</p>

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

  • 期刊论文

  • 发表日期：

    2026年6月1日

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  • Junjie Qu,
  • Junhao Mo,
  • Shanshan Wu,
  • Chao Shan,
  • Chanjuan Liu,
  • Xiaohua Huang

摘要

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.