Toward a practical method for measuring glass transition in polymers with low-frequency Raman spectroscopy

Glass transition temperature is one of the most important characteristics to describe behavior polymeric materials. When a material goes through glass transition, conformational entropy increases, which affects phonon density states. Amorphous materials invariably display low-frequency Raman features related states resulting in broad disorder band below 100 cm−1. This includes Boson peak and shoulder, dominated by van Hove peak, quasi-elastic Rayleigh scattering also contributes signal. The dependence ratio integrated intensity proximity that shows kink near as determined differential scanning calorimetry. Careful analysis spectra confirms this change at temperature. makes promising technique for thermal characterization polymers because not only chemically agnostic contactless but it requires neither calibration nor deconvolution chemometric analysis.