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1 H, 2 H and 13 C NMR spectra and molecular dynamics of some solid alkylene‐aromatic polyesters
Author(s) -
Kapralova V. M.,
Khachaturov A. S.,
Koltsov A. I.,
Skorokhodov S. S.,
Zuev V. V.
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910520120
Subject(s) - glass transition , methylene , phenylene , polyester , isotropy , polymer , anisotropy , polymer chemistry , nmr spectra database , annealing (glass) , crystallography , materials science , spectral line , molecular dynamics , chemistry , computational chemistry , organic chemistry , composite material , physics , quantum mechanics , astronomy
Molecular dynamics of some mesomorphic main–chain alkylene–aromatic polyesters have been investigated by means of NMR spectra of various nuclei over a wide temperature range. In solid polymers regions of different molecular mobilities coexist and their fractions are determined by the sample temperature and thermal history. The sample annealing leads to the growth of rigid fraction. It was found that below the glass transition temperature the only forms of large–scale mobility are the torsional vibrations and flips of para–phenylene groups, while spacer groups are virtually rigid. Above the glass temperature almost all phenylene rings undergo flipping motions and methylene groups of the spacer take part in complicated motions of both anisotropic and isotropic character.