Abstract
It is shown that the sorption method makes it possible to quantitatively estimate the presence of ordered structures in the supramolecular structure of partially crystalline and liquid-crystalline paraamide polymers. Using 1H NMR spectroscopy and the sorption method, the growth of liquid-crystalline type structures during spinning and thermal treatment of the poly(paraamide) fiber is analyzed. A comparison of the 1H NMR spectra of the as-spun and heat-treated fibers at low temperatures (110–210 K) in a rigid lattice reveals that “loose” disordered microregions occur in the fiber before thermal treatment. Thermal treatment results in the “healing” of structural defects and leads to the appearance of liquid-crystalline-type structures owing to the large-scale quasi-segmental motion at a high temperature.
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Original Russian Text © V.V. Zhizhenkov, S.F. Grebennikov, K.N. Busygin, N.G. Kvachadze, T.V. Smotrina, V.A. Smotrin, 2017, published in Vysokomolekulyarnye Soedineniya, Seriya A, 2017, Vol. 59, No. 2, pp. 156–164.
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Zhizhenkov, V.V., Grebennikov, S.F., Busygin, K.N. et al. Formation of liquid-crystalline-type structures in poly(paraamides). Polym. Sci. Ser. A 59, 198–205 (2017). https://doi.org/10.1134/S0965545X17020110
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DOI: https://doi.org/10.1134/S0965545X17020110