Near-Infrared Free-Radical and Free-Radical-Promoted Cationic Photopolymerizations by In-Source Lighting Using Upconverting Glass

Azra Kocaarslan, Sevcan Tabanli, Gonul Eryurek, Yusuf Yagci*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

A method is presented for the initiation of free-radical and free-radical-promoted cationic photopolymerizations by in-source lighting in the near-infrared (NIR) region using upconverting glass (UCG). This approach utilizes laser irradiation of UCG at 975 nm in the presence of fluorescein (FL) and pentamethyldiethylene triamine (PMDETA). FL excited by light emitted from the UCG undergoes electron-transfer reactions with PMDETA to form free radicals capable of initiating polymerization of methyl methacrylate. To execute the corresponding free-radical-promoted cationic polymerization of cyclohexene oxide, isobutyl vinyl ether, and N-vinyl carbazole, it was necessary to use FL, dimethyl aniline (DMA), and diphenyliodonium hexafluorophosphate as sensitizer, coinitiator, and oxidant, respectively. Iodonium ions promptly oxidize DMA radicals formed to the corresponding cations. Thus, cationic polymerization with efficiency comparable to the conventional irradiation source was achieved.

Original languageEnglish
Pages (from-to)14507-14510
Number of pages4
JournalAngewandte Chemie - International Edition
Volume56
Issue number46
DOIs
Publication statusPublished - 13 Nov 2017

Bibliographical note

Publisher Copyright:
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Funding

The authors would like to acknowledge an Istanbul Technical University Research Fund for financial support.

FundersFunder number
Istanbul Technical University Research Fund

    Keywords

    • cationic polymerizations
    • fluorescein
    • free radicals
    • near-infrared light
    • upconversion glass

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