Determination of Physical Properties of Reaction-Injection-Molded Polyurethanes by NIR-FT-Raman Spectroscopy

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Abstract
Near-infrared-FT-Raman spectroscopy can be used to nondestructively analyze reaction-injection-molded (RIM) Polyurethane elastomers. Unlike conventional 514.5-nm excitation, the 1064.1-nm excitation of NIR-FT-Raman spectroscopy does not produce significant sample fluorescence. In this work, the ability of NIR-FT-Raman spectroscopy to determine flex moduli of Polyurethane elastomers is evaluated. Comparisons are made between NIR-FT-Raman, dispersive Raman with 514.5-nm and 752-nm excitation, and NIR diffuse reflectance spectroscopy for Polyurethane analysis.