Low-energy vibrational excitations in polymethylmetacrylate with IR and RAMAN spectroscopy

Based on IR and Raman spectroscopy data, it was determined the minimum size of a chain segment (torsional-vibrational segment) and we found that low-energy vibrational excitations in polymethylmethacrylate (PMMA) and its oligomers with a degree of polymerization n=2,7,9 and 50 are due to the low-angle correlated torsionalvibrational dynamics preparing the relaxation mobility of macromolecules.

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