Non-destructive 3-dimensional mapping of microcapsules in polymeric coatings by confocal Raman spectroscopy |
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| Affiliation: | 1. Department of Materials and Chemistry, Research Group Electrochemical and Surface Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium;2. SIM vzw, Technologiepark 935, 9052 Zwijnaarde, Belgium;1. Ioffe Institute, Polytekhnicheskaya 26, St. Petersburg 194021, Russia;2. Peter the Great St. Petersburg Polytechnic University, Polytekhnicheskaya 29, St. Petersburg 195251, Russia;1. Branch of the Talrose Institute of Energy Problems of Chemical Physics of the Russian Academy of Sciences, Chernogolovka, Moscow Region 142432, Russia;2. Tambov State Technical University, Sovetskaya Street, 106, Tambov 392000, Russia;3. Moscow State Ivan Fyedorov University of Printing Arts, 2A, Pryanishnikova Street, 127550 Moscow, Russia;4. Clermont Université, Université Blaise Pascal, Institut de Chimie de Clermont-Ferrand, BP 10448, F-63000 Clermont-Ferrand, France;5. CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand, F-63171 Aubière, France;1. Department of Chemistry, Kerman Branch, Islamic Azad University, Kerman, Iran;2. Department of Chemistry, Yazd Branch, Islamic Azad University, Yazd, Iran;3. Department of Physics, University of Yazd, P.O. Box 97175/615, Yazd, Iran;1. Interface Material and Chemical Engineering Research Center & Advanced Functional Polymer Research Center, Korea Research Institute of Chemical Technology, Daejon 305-343, Republic of Korea;2. Department of Chemical and Biological Engineering and Institute of Chemical Processes, Seoul National University, Shilim-9-Dong, Gwanak-Gu, Seoul 151-744, Republic of Korea |
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| Abstract: | Nowadays, the properties of polymeric coatings are enhanced by various additives mixed into the resin. Recently, embedding of polymeric microcapsules into the coating matrix has been investigated to provide special on-demand features to the coating. The detection and characterization of such microcapsules in a polymeric coating are of major importance but difficult, because both are built up by similar molecules with similar densities. Current analysis methods require complex sample preparation to allow reliable measurements.In contrast, confocal Raman spectroscopy allows fast and non-destructive differentiation between characteristic molecular bonds at a spatial resolution below one micrometer. Hence, the objective of this research was to apply this technique on microcapsules embedded in a coating and provide answers to the following questions: Can one detect microcapsules embedded in a coating and clearly identify them? Can one differentiate between full and empty microcapsules and the coating matrix? Can one determine the exact location of the capsules and their distribution in the coating?Therefore, several two-dimensional confocal Raman spectroscopy mappings recorded at different depths allowed a three-dimensional reconstruction of the polymeric coating with the polymeric microcapsules in it. Thereby, the distribution of the capsules within the coating could be determined with micrometer resolution. As a result Raman tomography provides a more detailed insight into the distribution of microcapsules through the possibility of three-dimensional reconstruction. |
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| Keywords: | Confocal Raman spectroscopy Three-dimensional imaging Coating Polymer Microcapsules |
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