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Conformation, ordering and mobility of macromolecules in aromatic polyesters as studied by IR and solid‐state NMR spectroscopy
Author(s) -
Koltsov A. I.,
Kapralova V. M.,
Khachaturov A. S.,
Medvedeva D. A.,
Shilov S. V.,
Purkina A. V.,
Volchek B. Z.,
Skorokhodov S. S.,
Zuev V. V.
Publication year - 1993
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.19930720109
Subject(s) - mesogen , thermotropic crystal , macromolecule , methylene , polyester , crystallography , nuclear magnetic resonance spectroscopy , infrared spectroscopy , chemistry , spectroscopy , solid state nuclear magnetic resonance , polymer , materials science , stereochemistry , organic chemistry , liquid crystalline , nuclear magnetic resonance , biochemistry , physics , quantum mechanics
Thermotropic main‐chain LC polyesters have been studied with the aid of IR and NMR spectroscopy. Rigid mesogens and mesogens with a possibility of conformational isomerism were examined. The dependence of the order parameters of the mesogens and spacers on the chemical structure of the polymer has been determined. The IR spectroscopy data and the data of the calculation of the possible conformations of the mesogen and the spacer confirm the theoretical predictions about the straightening of macromolecules in the anisotropic melt. Solid‐state 2 H NMR spectra show that p‐oxybenzoic rings adjacent to a flexible spacer are more mobile than inner terphthalic rings. In decamethylene spacer the contrary holds true: the mobility of inner methylene groups is more marked than that of the α‐methylene groups bound to the mesogen.