Fourier transform infrared phase separation investigation

A rheoopticai method includes a mechanical test under static conditions (tensile test, stress relaxation, cyclic test) carried out simultaneously with an optical measurement. Among other optical methods such as x-ray scattering, nmr spectroscopy, polarized fluorescence or birefringence, the Fourier transform infrared (flir) spectroscopy has become one of the most frequently applied tools in rheooptics (22). Advantage of infrared spectroscopy is its sensitivity, rapidity, and the ability to investigate changes of molecular orientations not only in separate structural units but also in various phases of multiphase systems. From the ratio of intensities of beams polarized parallel and perpendicular to the deformation direction, orientation functions can be calculated. 

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