Abstract
Based on the data of low-frequency (terahertz) IR and Raman spectroscopy, it was found that low-energy vibrational excitations in PMMA and its oligomers with polymerization degrees n = 2, 7, 9, and 50 are due to small-angle correlated torsion-vibrational dynamics, which prepares the relaxation mobility of macromolecules. The minimum size of the chain segment ("torsion-vibrational segment"), the spectrum of which is identical to the spectrum of a high molecular weight polymer, is determined.
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