FOURIER-TRANSFORM INFRARED PHOTOACOUSTIC-SPECTROSCOPY OF POLYMERS ADSORBED FROM SOLUTION BY GAMMA-IRON OXIDE

It is possible to obtain infrared spectra of Estane 5703 and Phenoxy PKHH adsorbed onto the surface of gamma-iron oxide by FT-IR/PAS. Although the gamma-iron oxide absorbances contribute to the overall infrared spectrum, when substracted from the composite spectrum the infrared spectrum of the polymer is the result. The FT-IR/PAS spectra of the Estane 5703 and Phenoxy PKHH are in good spectral agreement with transmission spectra obtained from the same polymers. Peak resolution is good and qualitative identification is readily made. It was shown, with the use of FT-IR/PAS, that Estane 5703 and Phenoxy PKHH were adsorbed from solution by gamma-iron oxide, but that Phenoxy PKHH is preferentially absorbed over the Estane 5703.