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Grafting Multiwalled Carbon Nanotubes with Polystyrene to Enable Self-Assembly and Anisotropic Patchiness

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Azobenzene-based supramolecular polymers for processing MWCNTs.

Laura Maggini¹, Tomas Marangoni, Benoit Georges

¹Department of Chemistry and Namur Research College (NARC), University of Namur (FUNDP), Rue de Bruxelles 61, 5000 Namur, Belgium.

|December 11, 2012

Summary

This summary is machine-generated.

Researchers developed light-responsive polymers to control multi-walled carbon nanotube (MWCNT) suspensions. These polymers enable reversible dispersion and precipitation of MWCNTs in organic solvents using light or heat.

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Published on: June 1, 2016

Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Supramolecular polymers with azobenzene units exhibit photothermal responsiveness.
Controlling the dispersion of multi-walled carbon nanotubes (MWCNTs) in organic solvents is crucial for their applications.

Purpose of the Study:

To synthesize photothermally responsive supramolecular polymers.
To utilize these polymers as dispersants for MWCNTs.
To investigate the reversible control of MWCNT suspensions.

Main Methods:

Synthesis of azobenzene-containing supramolecular polymers.
Dispersion of MWCNTs in organic solvents using the polymers.
Monitoring solubilization/precipitation via UV-Vis absorption spectroscopy.
Characterization of MWCNT-polymer hybrids using TGA, XPS, TEM, and AFM.
Molecular dynamics simulations for structural analysis.

Main Results:

The supramolecular polymers effectively dispersed MWCNTs in organic solvents.
Trans-cis isomerisation of azobenzene units reversibly controlled MWCNT suspension.
Heating (cis→trans) favoured dispersion, while irradiation (trans→cis) induced precipitation.
UV-Vis spectroscopy successfully monitored the processes.
Characterization confirmed the formation of MWCNT-polymer hybrid materials.

Conclusions:

Photothermally responsive supramolecular polymers offer a novel method for reversible MWCNT dispersion and precipitation.
This approach provides tunable control over MWCNT suspensions for material applications.
The study demonstrates the potential of azobenzene-based polymers in nanotechnology and materials science.