Open AccessОсобенности локальной динамики и ориентационного состояния жесткоцепных жидкокристаллических полимеров
Author(s) -
В.А. Рыжов,
В.В. Жиженков,
Н.Г. Квачадзе
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.02.47141.218
Subject(s) - reptation , polymer , materials science , macromolecule , chemical physics , spectral line , bending , thermal motion , nuclear magnetic resonance , chemistry , thermodynamics , physics , composite material , biochemistry , astronomy
Proton magnetic resonance (PMR) spectra and terahertz IR spectra of Vectra A950 fibers and granules and Armos fibers before and after heat treatment were obtained and analyzed in order to understand the molecular mobility mechanisms that ensure the self-organization and restructurization of these rigid-chain liquid-crystal polymers, as well as their similarity and difference. It is shown that large-scale thermal (quasi-segmental) mobility in such LC polymers is due to the reptation of macromolecules with respect to each other and the conformational transitions necessary for the motion of chains in them are the result of random accumulation of displacements that occur during local bending and torsional-vibrational movements in the links of polymer chains according to the Bresler–Frenkel mechanism.