Abstract
Confocal Raman spectroscopy is used to measure concentration of solvents and polymer in ternary polymer - solvent -solvent coatings. A laser beam is focused through a pinhole arrangement at a location inside a sample. The scattered light is captured by a detector and its spectra are recorded in an attached computer. The spectrum is reported as intensity (in some arbitrary units) versus wave number (cm- 1). Ternary and binary polymer solvent systems should be chosen in such a way that the polymer and the solvents should be distinguished by having characteristic peak at some different wave numbers. The ratio of the intensity of the polymer to that of the solvent is calibrated against known ratio of concentration of the polymer to that of the solvent.
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