Thioxanthonation of fluorenone: Visible photoinitiator for radical polymerization

Thioxanthonation of fluorenone resulted in a new visible light initiator namely, indeno [1,2‐b]thioxanthene‐7,13‐dione (TX–FN). The detailed photophysical properties of the singlet and the triplet excited states of TX–FN are reported using steady‐state absorption, fluorescence, and phosphorescence,...

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Published in:Journal of polymer science. Part A, Polymer chemistry Polymer chemistry, 2016-04, Vol.54 (7), p.1012-1019
Main Authors: Karaca, Nurcan, Balta, Demet Karaca, Ocal, Nuket, Arsu, Nergis
Format: Article
Language:English
Subjects:
Absorption
camphorquinone
Flash photolysis
Fluorescence
Initiators
laser flash photolysis
Lasers
Phosphorescence
Photoinitiators
photophysical properties
photopolymerization
Polymerization
thioxanthone
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Summary:Thioxanthonation of fluorenone resulted in a new visible light initiator namely, indeno [1,2‐b]thioxanthene‐7,13‐dione (TX–FN). The detailed photophysical properties of the singlet and the triplet excited states of TX–FN are reported using steady‐state absorption, fluorescence, and phosphorescence, as well as laser flash photolysis techniques. Photoinitiated polymerization of MMA with TX–FN and CQ has been investigated in the presence and absence of a co‐initiator (MDEA). Additionally, Photo‐DSC studies were performed both in mono‐ and multiacrylate systems with TX–FN and parent compounds TX and FN. The obtained results were compared for formulations consisting of CQ. At low initiator concentrations, the conversions were lower than those obtained with TX–FN. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016, 54, 1012–1019
ISSN:0887-624X
1099-0518
DOI:10.1002/pola.27938