r'his column is a summary of the Analytical Series article, "Infrared Spectroscopy in the Analysis, Characterization, and Testing of Coatings," by John M. Chalmers of VSConsulting, published in the July 2005 issue of CoatingsTech. Visit https://docs. paint.org/Ct-Analytical-Series/Chalmers_Iuly2005-1767.pdf to read the complete article. The infrared portion of the electromagnetic spectrum is typically divided into three regions according to wavelength: the near-infrared region (-750 nm-2.5 μm), the mid-infrared region (-2.5 nm-25 μm), and the far-infrared region (> 25 μm). Many of the important vibrational frequencies of organic molecules occur in the mid-infrared region, and as a result this region is of particular interest for those in the coatings industry. Since the 1980s, modern Fourier transform infrared (FTIR) spectrometers have been among the most widely used mid-infrared tools for fingerprinting coatings on reflective substrates. This article describes many of the common mid-infrared sampling techniques available to the industry and demonstrates their usefulness in measuring key film properties.
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