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Ion Transport in Nanostructured Phosphonated Block Copolymers Containing Ionic Liquids.

Ha Young Jung1, Onnuri Kim1, Moon Jeong Park1

  • 1Department of Chemistry, Division of Advanced Materials Science, Pohang University of Science and Technology, Pohang, 790-784, Korea.

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|April 24, 2016
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Summary

This study explores poly(styrenephosphonate-b-methylbutylene) block copolymers with ionic liquids, revealing unique A15 lattice structures that enhance ion conductivity for advanced polymer membranes.

Keywords:
block copolymersionomersself-assemblysmall-angle X-ray scatteringstructure-property relations

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Area of Science:

  • Polymer Science
  • Materials Science
  • Electrochemistry

Background:

  • Block copolymers self-assemble into various morphologies.
  • Ionic liquids can influence polymer morphology and conductivity.
  • Understanding these relationships is key for designing functional materials.

Purpose of the Study:

  • To investigate the morphology and ionic conductivity of poly(styrenephosphonate-b-methylbutylene) block copolymers containing ionic liquids.
  • To explore the formation of novel self-assembled nanostructures.
  • To correlate nanostructure with ion-transport properties.

Main Methods:

  • Synthesis of poly(styrenephosphonate-b-methylbutylene) block copolymers.
  • Incorporation of ionic liquids into the polymer matrix.
  • Morphological characterization using techniques like transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS).
  • Ionic conductivity measurements.

Main Results:

  • Block copolymers exhibited well-defined self-assembled morphologies including lamellae, gyroid, hexagonal cylinder (HEX), body-centered cubic, and A15 lattice.
  • An equilibrium A15 lattice was observed in linear diblock copolymers, attributed to packing frustration and electrostatic interactions.
  • A15 lattice structures demonstrated significantly higher morphology factors (0.83-0.96) compared to HEX phases (0.42-0.69).

Conclusions:

  • The A15 lattice offers superior 3D symmetry for creating less tortuous ion-conduction pathways compared to 2D HEX structures.
  • This research paves the way for the rational design of nanostructured phosphonated polymer membranes with enhanced ionic conductivity.
  • The findings highlight the potential of these materials for applications requiring efficient ion transport.