Journal of Applied Polymer Science · 1983 · 26 citations · 15 references
Natural SciencesChemistryMaterials SciencePolymer ChemistrySpectroscopic AnalysisSpectroscopyOptical PolymersPolymer DegradationPolymer FoamsAbsorption SpectraConjugated MoleculesConjugated Polymer StructuresPhotoacoustic ResponsePhotoacoustic SpectroscopyPolymer Thermal DegradationPolyurethane FoamsSpectral Shifts
Abstract Polyurethane rigid foam shows substantial changes in its photoacoustic absorption spectra (PAS) on heating in the presence of air. These spectral changes are due to conjugated structures and quinone–imide formation, formed during degradation. The mechanism of degradation appears to be free radical in nature.
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Theory of the photoacoustic effect with solids
Allan Rosencwaig, A. Gersho · Journal of Applied Physics · 1976 · 2.4K citations