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Intermolecular Forces and Physical Properties02:56

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Updated: Jul 16, 2026

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
07:45

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

Linking Intrinsic Filler Properties to Gas Separation Performance in Polyimide-Based Mixed-Matrix Membranes.

Alba Torres1,2, Cenit Soto1,2, Javier Carmona1,2

  • 1Surface and Porous Materials (SMAP), Associated Research Unit to CSIC, Facultad de Ciencias, Universidad de Valladolid, Paseo Belén 7, 47011 Valladolid, Spain.

Polymers
|July 15, 2026
PubMed
Summary

Porous organic fillers in polyimide membranes significantly boost gas separation performance. These mixed-matrix membranes (MMMs) enhance permeability while maintaining selectivity, offering a promising strategy for efficient gas separation technologies.

Keywords:
d-spacingfree volumegas separationmixed-matrix membranesporous organic polymers

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Last Updated: Jul 16, 2026

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
07:45

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Polymer Science

Background:

  • Mixed-matrix membranes (MMMs) are crucial for gas separation.
  • High-performance polyimides offer excellent mechanical properties but can have limited permeability.
  • Porous organic fillers can enhance membrane transport properties.

Purpose of the Study:

  • To investigate the influence of free volume and molecular architecture on gas transport in MMMs.
  • To develop a matrix-independent method for estimating intrinsic filler permeabilities.
  • To explore structure-property relationships in MMMs for gas separation.

Main Methods:

  • Incorporation of four rigid, porous organic fillers (TFAP-Trp, Is-Trp, TFAP-TPB, Is-TPB) into seven polymer matrices (P84®, Matrimid®, Pi-DAPOH, Pi-DAROH, Pi-HABAc, Pi-DAM, PIM-1).
  • Matrix-independent methodology to estimate intrinsic filler permeabilities for He, O2, N2, CH4, and CO2.
  • Analysis of gas permeability and selectivity as a function of filler properties (FFV, BET surface area) and gas kinetic diameter.

Main Results:

  • A strong correlation was found between filler fractional free volume (FFV), BET surface area, and gas permeability.
  • Isatin-based fillers showed particularly high CO2 permeability.
  • Filler incorporation enhanced permeability by 100-350% with maintained or improved selectivity (CO2/CH4, He/CH4).
  • Several MMMs approached or exceeded the Robeson upper bound, indicating improved performance.
  • Filler-induced disruption of polymer packing and creation of transport pathways were identified as key factors.

Conclusions:

  • Rationally designed porous organic fillers are effective in enhancing gas separation performance of polyimide membranes.
  • MMMs can mitigate the permeability-selectivity trade-off, improving gas separation efficiency.
  • These findings offer a broadly applicable strategy for developing advanced membrane materials.