EVALUATION STATISTICAL SEGMENTS OF AMORPHOUS CARBON - CHAIN POLYMERS BASED ON DATA IR - SPECTROSCOPY OF THE TERAHERTZ RANGE
نویسندگان
چکیده
Получены и проанализированы низкочастотные ИК- спектры стеклообразных полимеров: полистирола, поликарбоната, полиметилметакрилата, полиамида-6 полиакрилонитрила при 90K в диапазоне 0.24 - 6 THz (8 200 cm), где проявляется поглощение, обусловленное как индивидуальными (60 140 так коллективными крутильными (либрационными) колебаниями (10 20 предшествующими проявлению релаксационной динамики. Показано, что присутствующие низкочастотных ИК спектрах коллективные крутильно-колебательные моды, обусловленные корреляцией либрационных колебаний на участке цепи, соизмеримом со статистическим сегментом, ответственны за избыточную плотность колебательных состояний. Эта избыточная состояний виде пика изученных спектрах, представленных координатах , We obtained and analyzed low-frequency ir spectra of glassy polymers: polystyrene, polycarbonate, polymethylmethacrylate, polyamide-6, polyacrylonitrile at in the range where absorption appears due to both individual cm) collective torsional (librational) vibrations preceding manifestation relaxation dynamics. It is shown that torsional-vibrational modes present ir-spectra, caused by correlation librational chain section, commensurate with Kuhn's statistical segment, are responsible for excess density vibrational states. This states manifests itself as a peak studied ir-spectra presented coordinates
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ژورنال
عنوان ژورنال: Vestnik Tverskogo gosudarstvennogo universiteta
سال: 2022
ISSN: ['1995-0152']
DOI: https://doi.org/10.26456/vtchem2022.1.9