Applicability of quinolizino-coumarins for monitoring free radical photopolymerization by fluorescence spectroscopy |
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| Affiliation: | 1. Department of Physics and Electronics, Beijing University of Chemical Technology, Beijing 100029, China;2. School of Materials Science and Technology, China University of Geosciences (Beijing), Beijing 100083, China;1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;2. Institute of Super-Microstructure and Ultrafast Process in Advanced Materials, Central South University, Changsha 410083, China;3. Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;1. University of Warsaw, Faculty of Physics, Pasteura 7, 02-093 Warsaw, Poland;2. Institute of Electronic Materials Technology, Wolczynska 133, 01-919 Warsaw, Poland;3. Warsaw University of Technology, Institute of Microelectronics and Optoelectronics, Koszykowa 75, 00-662 Warsaw, Poland |
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| Abstract: | ![]()
Applicability of commercially available 2,3,5,6-1H,4H-tetrahydro-quinolizino[9,9a,1-gh]coumarin (Coumarin 6H) and its 9-methyl (Coumarin 102), 9-trifluoromethyl (Coumarin 153) and 10-carboxy (Coumarin 343) derivatives as fluorescent molecular probes for monitoring progress of free radical photopolymerization of several acrylic and methacrylic monomers by Fluorescence Probe Technique (FPT) has been tested. The progress of the photopolymerization was monitored using a specially designed cure monitoring system. It was found that all the quinolizino-coumarins shifted their fluorescence spectra towards shorter wavelengths with progress of polymerization, which enabled monitoring the progress in terms of fluorescence intensity ratios as the progress indicator. Coumarin 6H turned out to be the most sensitive to changes occurring during polymerization. Coumarin 102 and Coumarin 153 exhibit only about 20% lower sensitivity than that of Coumarin 6H, so those are also good enough for the cure monitoring of acrylic monomers, except for tetraethylene glycol diacrylate, where the quinolizino-coumarins response was disturbed by some fluorescent side product. Moreover, it has been found that the FPT technique has some limitations in the case of monofunctional monomers. |
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| Keywords: | Molecular probes Free radical photopolymerization Reaction monitoring Fluorescence spectroscopy FPT |
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