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Dynamic Nitroxide Functional Materials.

Hendrik Woehlk1,2, Andrea Lauer1,2, Vanessa Trouillet3,4

  • 1School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), 2 George Street, QLD, 4000, Brisbane, Australia.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 18, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a versatile coating platform for surface functionalization using nitroxide radical coupling (NRC). The system allows for rewritable and light-driven polymer surface coding, demonstrated via spectroscopy.

Keywords:
dynamic covalent chemistrynitroxide radicalsphotochemistrypolydopamine coatingsurface functionalization

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Chemistry

Background:

  • Surface functionalization is crucial for advanced material applications.
  • Existing methods often lack versatility and spatial control.
  • Bioinspired dopamine chemistry offers a versatile platform for surface modification.

Purpose of the Study:

  • To develop a substrate-independent coating platform for spatially resolved surface functionalization.
  • To introduce a rewritable and light-driven polymer surface coding system.
  • To demonstrate the platform's utility in grafting-to polymer surface ligations.

Main Methods:

  • Utilized nitroxide radical coupling (NRC) reactions and thermo-labile alkoxyamine formation.
  • Synthesized nitroxide-decorated poly(glycidyl methacrylate) (PGMA) microspheres via dopamine chemistry.
  • Employed electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) for characterization.
  • Demonstrated "grafting-to" polymer surface ligations with poly(methyl methacrylate) (PMMA) and poly(2,2,2-trifluoroethyl methacrylate) (PTFEMA) using photoclick NRC reactions.

Main Results:

  • Achieved reversible coding and decoding of nitroxide functional microspheres.
  • Successfully conjugated small functional groups in a rewritable manner.
  • Demonstrated spatially confined polymer surface ligations.
  • Visualized light-driven polymer surface coding using time-of-flight secondary ion mass spectrometry (ToF-SIMS) and XPS imaging.

Conclusions:

  • The developed nitroxide coating platform is versatile and substrate-independent.
  • The system enables rewritable and spatially resolved surface functionalization.
  • This approach facilitates advanced polymer surface modifications and coding applications.