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Related Experiment Video

Updated: Apr 13, 2026

Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Molecular Composite Coatings on Nafion Using Layer-by-Layer Self-Assembly.

Christophe J Lefaux1, Byoung-Suhk Kim2, Narayanan Venkat3

  • 1†Polymer Program, Institute of Materials Science and Chemical Engineering Department, University of Connecticut, Storrs, Connecticut 06269, United States.

ACS Applied Materials & Interfaces
|April 30, 2015
PubMed
Summary

Controlled growth of sulfonated poly(benzobisimidazole) (SPBI) and poly(2-vinylpyridine) (P2VP) multilayers was achieved using electrostatic layer-by-layer self-assembly. These coatings enhance Nafion membrane stiffness and thermal stability.

Keywords:
adsorptioncomplexationlayer-by-layermembranesmolecular compositemultilayers

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Developing advanced polymer coatings is crucial for enhancing material properties.
  • Layer-by-layer (LbL) self-assembly offers precise control over multilayer film fabrication.
  • Sulfonated poly(benzobisimidazole) (SPBI) and poly(2-vinylpyridine) (P2VP) are suitable for electrostatic complexation.

Purpose of the Study:

  • To explore controlled growth of SPBI/P2VP multilayer coatings on quartz and Nafion membranes.
  • To investigate the self-assembly behavior and film characteristics of SPBI/P2VP multilayers.
  • To evaluate the thermal stability and mechanical enhancement of Nafion membranes coated with SPBI/P2VP multilayers.

Main Methods:

  • Electrostatic layer-by-layer (LbL) self-assembly in methanol solutions.
  • UV-vis absorption spectrophotometry for monitoring film growth.
  • Atomic force microscopy (AFM) for surface topography and thickness analysis.
  • X-ray scattering for orientation studies.
  • Isothermal gravimetric analysis for thermal stability assessment.

Main Results:

  • A steady-state linear growth regime was observed for SPBI/P2VP multilayer films after initial deposition cycles.
  • AFM confirmed successful multilayer formation with controlled thickness and roughness.
  • SPBI rods were confined to the plane of the coating, showing anisotropic orientation in the parallel direction.
  • The SPBI/P2VP coated Nafion membranes exhibited enhanced thermal stability up to 310 °C.
  • Significant increase in Nafion membrane stiffness was achieved with minimal coating thickness.

Conclusions:

  • LbL self-assembly provides a reliable method for fabricating SPBI/P2VP multilayer coatings.
  • The SPBI/P2VP multilayers demonstrate controlled growth and specific orientation characteristics.
  • Coating Nafion membranes with SPBI/P2VP multilayers effectively improves their thermal stability and mechanical stiffness.