Abstract
The photo-curing reaction of dental resins has been examined with unilateral nuclear magnetic resonance (NMR-MOUSE) allowing nondestructive high-resolution measurement of depth profiles as a function of time and space. The NMR signal is sensitive to both the monomer concentration and changes in molecular mobility. Upon irradiation with blue light, it first increases due to molecular mobility enhanced by the reaction heat and then decreases exponentially with the monomer concentration as the polymer signal is lost in the dead time of the instrument upon curing. The space and time dependence of the NMR signal can be described by the photo-polymerization reaction kinetics together with a heuristic approximation of the temperature dependence.
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Acknowledgments
The author A.M.N. thanks the Brazilian National Council for Scientific and Technological Development (CNPq) for financial support (Grant No. 290010/2009-8). The author B.M. thanks the Federal Republic of Germany, Ministry of Education and Research for financial support due to the FHProfUnt project (Grant No. 17081X10). The author B.H. acknowledges the support of Operational Program Research and Development for Innovations co-funded by the European Regional Development Fund (ERDF) and national budget of Czech Republic, within the framework of project Centre of Polymer Systems (reg. number: CZ.1.05/2.1.00/03.0111).
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Marchi Netto, A., Steinhaus, J., Hausnerova, B. et al. Time-Resolved Study of the Photo-Curing Process of Dental Resins with the NMR-MOUSE. Appl Magn Reson 44, 1027–1039 (2013). https://doi.org/10.1007/s00723-013-0458-6
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DOI: https://doi.org/10.1007/s00723-013-0458-6