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Polymer nanofilms with enhanced microporosity by interfacial polymerization.

Maria F Jimenez-Solomon1, Qilei Song1, Kim E Jelfs2

  • 1Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.

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|May 3, 2016
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Summary

Researchers developed novel microporous organic polymer membranes using contorted monomers for enhanced solvent separation. These ultrathin polyarylate nanofilms exhibit superior permeability and selectivity in organic solvents.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Separation Science

Background:

  • Highly permeable and selective membranes are crucial for energy-efficient separations.
  • Microporous organic polymers offer high porosity and selectivity but face challenges in solvent stability and controlled microporosity.
  • Existing methods struggle to create robust, selective polymer membranes with tunable pore structures.

Purpose of the Study:

  • To design and fabricate crosslinked, rigid polymer nanofilms with enhanced microporosity and solvent stability.
  • To investigate the effect of monomer structure on polymer microporosity and separation performance.
  • To develop advanced composite membranes for efficient separation in organic solvents.

Main Methods:

  • In situ interfacial polymerization to form ultrathin polyarylate nanofilms (down to 20 nm).
  • Utilizing contorted monomers to manipulate molecular structure and enhance microporosity.
  • Fabricating composite membranes by layering polyarylate nanofilms onto crosslinked polyimide ultrafiltration supports.
  • Employing molecular simulations to rationalize enhanced microporosity and void interconnectivity.

Main Results:

  • Achieved enhanced microporosity and higher interconnectivity of intermolecular network voids by using contorted monomers.
  • Successfully fabricated ultrathin polyarylate nanofilms with controlled microporosity.
  • Composite membranes demonstrated outstanding separation performance in organic solvents.
  • Observed up to two orders of magnitude higher solvent permeance compared to membranes made with planar monomers.

Conclusions:

  • Contorted monomers are effective in designing rigid, crosslinked polymer nanofilms with enhanced microporosity.
  • The developed in situ fabricated polyarylate nanofilms offer superior performance for solvent separations.
  • This approach provides a promising pathway for creating advanced membranes for challenging separation applications.