Excitation Dependence in Photoiniferter Polymerization

We report on a fundamental feature of photoiniferter polymerizations mediated with trithiocarbonates and xanthates. The polymerizations were found to be highly dependent on the activated electronic excitation of the iniferter. Enhanced rates of polymerization and greater control over molecular weigh...

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Bibliographic Details
Published in:ACS macro letters 2023-01, Vol.12 (1), p.14-19
Main Authors: Hughes, Rhys W., Lott, Megan E., Bowman, Jared I., Sumerlin, Brent S.
Format: Article
Language:English
Subjects:
Photolysis
Polymerization
Sulfur Compounds
Thiones
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Summary:We report on a fundamental feature of photoiniferter polymerizations mediated with trithiocarbonates and xanthates. The polymerizations were found to be highly dependent on the activated electronic excitation of the iniferter. Enhanced rates of polymerization and greater control over molecular weights were observed for trithiocarbonate- and xanthate-mediated photoiniferter polymerizations when the n → π* transition of the iniferter was targeted compared to the polymerizations activating the π → π* transition. The disparities in rates of polymerization were attributed to the increased rate of C–S photolysis which was confirmed using model trapping studies. This study provides valuable insight into the role of electronic excitations in photoiniferter polymerization and provides guidance when selecting irradiation conditions for applications where light sensitivity is important.
ISSN:2161-1653
2161-1653
DOI:10.1021/acsmacrolett.2c00683