Intramolecular Charge Transfer Complexes as Fluorescence Probes for UV and Visible Light Induced Acrylate Polymerization
BOWLING GREEN STATE UNIV OH CENTER FOR PHOTOCHEMICAL SCIENCES
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Intramolecular charge transfer complexes ICTC of derivatives of 1- diaminonaphthalene-5-sulfonamide DANSYL AMIDE such as 1-dimethylamino- naphthalene-5-sulfonyl-n-butylamide 1,5-DASB and 2-dimethylamino-naphthalene- 5-sulfonyl-n-butylamide 2,5DASB, were used as fluorescence probes for cure monitoring of photocurable polymer systems. This technique is based upon the difference in fluorescence intensity from the parallel and perpendicular conformations of the excited state of the complex, and is based on the dependence of the relative population of each conformation on the microviscosity of the system. As the curing reaction proceeds, the steady state fluorescence emission spectra of the probes were all found to exhibit hypsochromic spectral shifts due to the increase in matrix microviscosity. A linear correlation between the fluorescence intensity ratios RIpar. Iper. and the extent of polymerization, measured by transmission FTIR spectrometry, was obtained for different types of acrylated polymers, cured with UV or visible VIS initiators. Intramolecular charge transfer, Visible light induced acrylate polymerization.
- Organic Chemistry
- Polymer Chemistry
- Electricity and Magnetism