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Photocrosslinkable Polymeric Bicontinuous Microemulsions.

Michael B Sims1, Joshua W Goetze1, Gabriela Diaz Gorbea1

  • 1Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States.

ACS Applied Materials & Interfaces
|February 12, 2023
PubMed
Summary

Researchers developed a photocrosslinking method for bicontinuous microemulsions, enabling detailed structural analysis and creating robust materials for energy storage. This technique preserves intricate network structures for advanced applications.

Keywords:
bicontinuous microemulsioncoumarindiblock polymersmicrophase separationnanoporous materialsphotocrosslinkingpolymer blends

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Area of Science:

  • Polymer Science
  • Materials Chemistry
  • Nanotechnology

Background:

  • Bicontinuous microemulsions (BμE) offer unique network structures but are challenging to stabilize for characterization and application.
  • Photocrosslinking provides a non-disruptive method for stabilizing complex polymer morphologies.
  • Coumarin derivatives are suitable for photocrosslinking via [2+2] photodimerization.

Purpose of the Study:

  • To present a phase-selective photocrosslinking approach for ternary polymer blends forming bicontinuous microemulsions.
  • To enable detailed structural characterization of these microemulsions.
  • To demonstrate the potential of crosslinked BμE materials in applications like energy storage.

Main Methods:

  • Ternary blends of poly(methoxyethyl acrylate) (PM), poly(hexyl methacrylate-co-coumarin methacrylate) (PHC), and PM-b-PHC diblock polymer were synthesized.
  • Phase-selective photocrosslinking was achieved using the [2+2] photodimerization of coumarin methacrylate units.
  • Structural characterization was performed using scanning electron microscopy (SEM) and atomic force microscopy (AFM).
  • Mechanical properties were tested, and ionic liquid infiltration was conducted for electrolyte applications.

Main Results:

  • Photocrosslinking successfully stabilized the bicontinuous microemulsion structure without thermal or chemical disruption.
  • Crosslinked BμE materials exhibited rubbery behavior with a high elastic shear modulus (nearly 1 MPa at 70 °C).
  • The BμE morphology was observed to be robust, existing over a wide temperature and compositional range.
  • A derived solid electrolyte showed a room-temperature ionic conductivity of 2 mS/cm.

Conclusions:

  • Photocrosslinking is an effective strategy for stabilizing and characterizing bicontinuous microemulsions derived from ternary polymer blends.
  • The resulting crosslinked materials possess desirable mechanical properties and structural integrity for advanced applications.
  • This approach offers a versatile platform for developing functional materials, such as solid electrolytes for energy storage.