金属・有機枠ベースの混合マトリックス膜のインターフェイシャルエンジニアリングは,共振的に移植されたポリイマイドブラシを使用します
Hongliang Wang1, Sanfeng He1, Xuedi Qin1
1School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China.
Journal of the American Chemical Society
|November 16, 2018
まとめ
ポリイミドブラシを金属有機フレーム (MOF) の表面に挿入すると,ガス分離のための堅固な膜が生成されます. これらの改造されたMOF膜は,高いMOF負荷下でも,性能と柔らかさを高めています.
科学分野:
- 材料科学
- 化学工学
- ポリマー科学
背景:
- 界面の互換性は,ガス分離における金属有機枠 (MOF) ベースの混合マトリックス膜 (MMM) にとって極めて重要です.
- 伝統的なMMMは,MOF-ポリマーの相互作用が悪いことが多く,その性能が制限されます.
研究 の 目的:
- MOF-ポリマーのインターフェースを,共振的に移植されたポリミドブラシを使って設計する.
- 高性能MMMを開発し,機械性能とガス分離能力を向上させる.
主な方法:
- ポリイミドブラシをMOFの表面に共振的に挿入する.
- 伝統的なポリマーマトリックスなしで,高 MOF 負荷 (88 wt%) を有する独立した膜の製造.
- 膜の柔らかさ,インターフェイスの整合性,ガス分離性能 (CO2/N2,CO2/CH4) を評価する.
主要な成果:
- ポリイミドで埋め込まれたMOF粒子は,MOFの88%の重量で安定した独立した膜を形成した.
- 修飾された膜は,有意に改善された柔らかさ (最大472%) と,インターフェイスの撕裂を減少させた.
- CO2の可塑化に対する耐性が向上し,マトリックス鎖の移動性が低下することが観察された.
- CO2/N2とCO2/CH4の分離の選択性および透過性の同時増加は,MOFの負荷を増やすことで達成された.
結論:
- 協和的に埋め込まれたポリミドブラシは,MOF-ポリマーインターフェースを効果的に設計し,従来のMMMの限界を克服します.
- 開発されたMOFベースの膜は優れた機械性能と優れたガス分離性能を提供します.
- このアプローチは,理論的な予測と整合しながら,分離効率を維持し,改善しながら,高いMOF負荷を可能にします.
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