FTIR micro DRIFTS

Low levels of reflected energy, even from micro samples, can be measured by FTIR instruments. This method is termed diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. A reflectometer design with hemiellipsoidal mirrors sliding back for sample positioning is very convenient (Fig. 4.1.4). 

Comparison of a PS-PMMA blend with a corresponding copolymer gave information on the chemical drift. In the analysis of a competitive modified vinyl polymer sample by SEC/FTIR, some of the components of the binder could be readily identified (vinyl chloride, ethyl methacrylate, acrylonitrile), and an epoxi-dized drying oil additive was also detected. An analysis of styrene-butadiene copolymers, including a determination of the styrene/butadiene ratio and of the micro structure of the butadiene units cis/trans, l,2-/l,4-units), was performed by Pasch et al. 

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