Abstract
The advent of Fourier transform infrared spectroscopy has allowed for the use of the photoacoustic detection technique in the infrared region of the electromagnetic spectra. Urban recently described the advantages of photoacoustic Fourier transform infrared spectroscopy (PAS/FT-IR) in the characterization of polymeric coatings and interfaces at various depths at the molecular level. Nonetheless, because of the strong tendency for PAS/FT-IR spectra to be distorted due to saturation of peaks with strong absorbances, PAS/FT-IR has found only limited use as a quantitative procedure. In this report we describe how, with careful selection of a reference peak, one can use the strong peak saturation characteristic of PAS/FT-IR to advantage in the quantification of small amounts of residual unsaturation in a photo-cured acrylate coating.
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