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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Polydopamine as a Visible-Light Photosensitiser for Photoinitiated Polymerisation.

Christopher G Bailey1, Mitchell D Nothling2, Lucy L Fillbrook2

  • 1ARC Centre of Excellence in Exciton Science, School of Physics, University of New South Wales, Sydney, Australia.

Angewandte Chemie (International Ed. in English)
|March 13, 2023
PubMed
Summary

Polydopamine (PDA) free radicals are photo-responsive, acting as a visible-light-activated catalyst. This discovery enables PDA nanoparticles to initiate polymerization, offering new applications for melanin-like materials.

Keywords:
Electron Spin ResonanceMelaninPhotosensitizerPolydopaminePolymerisation

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Area of Science:

  • Materials Science
  • Photochemistry
  • Polymer Chemistry

Background:

  • Polydopamine (PDA) mimics melanin, exhibiting versatile opto-electronic properties.
  • PDA possesses stable free radical species, crucial for its catalytic activity.

Purpose of the Study:

  • To investigate the photo-responsiveness of PDA free radicals.
  • To establish PDA as a photo-redox catalyst for initiating polymerization.

Main Methods:

  • Electron spin resonance (ESR) spectroscopy to analyze radical populations.
  • Utilizing PDA nanoparticles to photosensitize photoinitiators.
  • In situ 1 H nuclear magnetic resonance (NMR) spectroscopy to monitor polymerization.

Main Results:

  • Visible light reversibly amplifies PDA semiquinone radical populations.
  • PDA's photo-response alters its redox potential, enabling photoinduced electron transfer (PET).
  • PDA successfully initiated free-radical polymerization (FRP) of vinylic monomers under visible light.

Conclusions:

  • PDA free radicals are photoactive and can function as a photosensitizer.
  • This research reveals novel photo-redox catalytic applications for polydopamine.
  • The findings provide insights into the photophysics of melanin-like materials.