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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Wavelength-Resolved PhotoATRP.

Martina Nardi1, Eva Blasco1,2, Christopher Barner-Kowollik1,3

  • 1Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

Journal of the American Chemical Society
|January 10, 2022
PubMed
Summary
This summary is machine-generated.

This study maps wavelength-dependent photochemical atom transfer radical polymerization (ATRP) using pulsed-laser polymerization. Findings reveal optimum wavelengths for photoATRP, crucial for designing advanced soft matter materials.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Photoinduced reversible-deactivation radical polymerizations (RDRP) are vital for soft matter materials.
  • Understanding wavelength-dependent behavior is key for optimizing photochemical polymerizations.
  • Atom Transfer Radical Polymerization (ATRP) is a prominent RDRP technique.

Purpose of the Study:

  • To investigate the wavelength-specific performance of photochemically induced ATRP.
  • To correlate polymer properties with the absorption spectrum of copper(II) catalysts.
  • To identify optimal wavelengths for efficient photoATRP.

Main Methods:

  • Utilized nanosecond pulsed-laser polymerization (PLP) to study methyl acrylate polymerization.
  • Mapped photochemical reactivity across a wavelength range of 305-550 nm.
  • Analyzed polymer conversion, molecular weight, and dispersity at constant photon flux.

Main Results:

  • Observed a red shift in the action spectrum compared to the copper(II) catalyst's absorption spectrum.
  • Demonstrated a clear wavelength dependence for both number-average molecular weight and dispersity.
  • Confirmed a linear correlation between molecular weight and conversion across tested wavelengths.

Conclusions:

  • The study provides essential data for selecting optimal wavelengths in photoATRP.
  • This wavelength mapping is critical for the precise design of soft matter materials.
  • Results advance the application of photochemical RDRP in materials science.