This article is cited in 6 papers

Spectroscopy of condensed matter

A study of low-energy processes in polymethyl methacrylate and its short-chain oligomers by terahertz IR and Raman spectroscopies

V. A. Ryzhov

Ioffe Institute, 194021, St. Petersburg, Russia

Abstract: Based on the data of low-frequency (terahertz) IR and Raman spectroscopies, it is established that low-energy vibrational excitations in PMMA and its oligomers with a degree of polymerization $n$ = 2, 7, 9, and 50 are due to correlated small-angle torsional–vibrational dynamics, which prepares the relaxational mobility of macromolecules. The minimum size of the chain segment (“torsional–vibrational segment”), the spectrum of which is identical to the spectrum of the high-molecular polymer, is determined.

Keywords: Raman spectroscopy, low-energy vibrational excitations, relaxation mobility, PMMA oligomers.

Received: 27.11.2018
Revised: 02.09.2019
Accepted: 03.09.2019

DOI: 10.21883/OS.2019.12.48682.340-18

 English version: Optics and Spectroscopy, 2019, 127:6, 979–983

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