Open AccessИзучение низкоэнергетических процессов в полиметилметакрилате и его короткоцепочечных олигомерах методом терагерцовой ИК и рамановской спектроскопии
Author(s) -
В.А. Рыжов
Publication year - 2019
Publication title -
žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-748X
pISSN - 0044-4642
DOI - 10.21883/os.2019.12.48682.340-18
Subject(s) - raman spectroscopy , torsion (gastropod) , macromolecule , polymer , vibrational spectrum , vibrational energy relaxation , materials science , infrared spectroscopy , polymerization , molecular vibration , molecular physics , relaxation (psychology) , chemistry , chemical physics , computational chemistry , physics , optics , molecule , organic chemistry , medicine , biochemistry , surgery , composite material , psychology , social psychology
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.