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Analysis of reaction‐injection‐molded polyurethanes by near‐infrared diffuse reflectance spectroscopy
Author(s) -
Miller Charles E.,
Eichinger B. E.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070420807
Subject(s) - diffuse reflectance infrared fourier transform , materials science , near infrared spectroscopy , spectroscopy , polyurethane , partial least squares regression , infrared spectroscopy , diffuse reflection , principal component analysis , elastomer , attenuated total reflection , analytical chemistry (journal) , composite material , chemistry , optics , chromatography , organic chemistry , physics , statistics , mathematics , photocatalysis , quantum mechanics , catalysis , artificial intelligence , computer science
The ability of near‐infrared (NIR) diffuse reflectance spectroscopy to characterize reaction‐injection‐molded (RIM) polyurethane elastomers is demonstrated. The advantage of NIR spectroscopy over other analytical methods is its ability to analyze samples without any preparation. In this work, the specific effects of composition, density, phase separation, and moisture content on the NIR spectra of the polymers are identified. In addition, the ability of NIR spectroscopy to make rapid assessments of physical properties, such as heat sag and flex modulus, is demonstrated. In order to perform these analyses, the multivariate statistical methods of principal components analysis (PCA) and partial least squares (PLS) are used.
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