Optics and Spectroscopy
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Universal features of the manifestation of the relationship between local and segmental dynamics of polymers at terahertz frequencies in IR spectra
Low-frequency IR- spectra of glassy polymers were obtained and analyzed at temperatures from 90 to 400 K. Temperature changes in the IR- spectra in the range from 10 to 140 cm-1 show three universal features: low-temperature, corresponding to the torsional-vibrational motion of monomer units, high-temperature, due to the influence of primary relaxation (glass transition) and intermediate, caused by the activation of conformational mobility in chains at a temperature of β-transition. This versatility extends both to polymers with universal chain-to-chain interactions and to those with hydrogen bonds. Keywords: IR spectra, excess density of vibrational states, bosonic peak, molecular dynamics, α- and β-relaxations.
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