Issue 43, 2023

Wavelength-resolved near infra-red light induced free-radical polymerization

Abstract

Initiating polymerization processes at long wavelengths, ideally in the near-infrared (NIR) range, is critical to enable applications where shorter wavelengths may be harmful and where high penetration depths may be required. While we have recently demonstrated that gold nanorods (AuNR) function as effective photothermal converters at 800 nm to initiate free radical polymerizations, a careful wavelength-by-wavelength assessment (photochemical action plot analysis) of their effectiveness is outstanding. Herein, we provide a full NIR action plot from 620 to 950 nm, probing the wavelength-by-wavelength monomer to polymer conversion with an identical number of photons at each wavelength. While the vast majority of action plots show a red-shift relative to the absorption spectrum, we herein observe a pronounced blue-shift for the most effective conversion.

Graphical abstract: Wavelength-resolved near infra-red light induced free-radical polymerization

Supplementary files

Article information

Article type
Paper
Submitted
30 Sep 2023
Accepted
11 Oct 2023
First published
12 Oct 2023

Polym. Chem., 2023,14, 4912-4917

Wavelength-resolved near infra-red light induced free-radical polymerization

P. Neidinger, J. Davis, J. A. Carroll, J. Kammerer, E. Jaatinen, S. L. Walden, A. Unterreiner and C. Barner-Kowollik, Polym. Chem., 2023, 14, 4912 DOI: 10.1039/D3PY01097J

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