Correlations between physical properties, formulations, and ATR FTIR spectra of polyurethane foams

Joel A. Caughran; Sanmitra A. Bhat; James A. de Haseth

doi:10.1117/12.166624

31 January 1994 Correlations between physical properties, formulations, and ATR FTIR spectra of polyurethane foams

Joel A. Caughran, Sanmitra A. Bhat, James A. de Haseth

Proceedings Volume 2089, 9th International Conference on Fourier Transform Spectroscopy; (1994) https://doi.org/10.1117/12.166624
Event: Fourier Transform Spectroscopy: Ninth International Conference, 1993, Calgary, Canada

Abstract

Polyurethane foams of varying surfactant, tin catalyst, and amine catalyst levels were prepared to find formulations that made `good' foams. A good foam is characterized by rise and density. Attenuated Total Reflectance spectra of the foams were collected after the foams were allowed to cure for 24 hours. Because the infrared spectrum shows morphology as well as structure, the ATR spectrum can be used to measure physical properties that are dependent on structure and morphology. The ATR FT-IR spectra were baseline corrected and then normalized by the area in the C-H stretch region to correct for differences in contact area with the ATR crystal. Samples were then taken from the cured foam parallel to the direction of rise to measure tensile strength and air permeability. Correlations were then made between the ATR spectra and the physical properties. Partial least squares (PLS) and principle component regression (PCR) were used to do the correlations.

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Joel A. Caughran, Sanmitra A. Bhat, and James A. de Haseth "Correlations between physical properties, formulations, and ATR FTIR spectra of polyurethane foams", Proc. SPIE 2089, 9th International Conference on Fourier Transform Spectroscopy, (31 January 1994); https://doi.org/10.1117/12.166624

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KEYWORDS

Foam

Polyurethane

Attenuated total reflectance

FT-IR spectroscopy

Infrared radiation

Crystals

Tin

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