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Molecular dynamics of thermotropic liquid-crystalline polymer: Polydecamethyleneterephthaloyl-bis-4-oxybenzoate using2H NMR spectroscopy

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Abstract

2H NMR spectra of a selectively deuterated liquid crystalline, polydecamethylene-terephthaloyl-bis-4-oxybenzoate, have been investigated in the temperature range from 25 to 100°C. It was found that polymer regions exist with greatly differing molecular mobility. It was shown that the molecular mobility in the polymer depends on its thermal history. The molecular mobility in an aromatic fragment is caused by the vibrational motions of 1,4-phenylene rings with different amplitudes. The fractions of para-phenylene groups undergoing torsional vibrations with high amplitudes increase with temperature and flips of the central phenylene rings of mesogenic triads are observed. The mobility in aliphatic fragments is due to transgauche isomerization and translation motion with the participation of several bonds.

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Authors and Affiliations

  1. Institute of Macromolecular Compounds of the Academy of Sciences of the USSR, Bolshoi pr., 31, 199004, Leningrad, USSR

    V. M. Kapralova, V. V. Zuev, A. I. Koltsov, S. S. Skorokhodov & A. S. Khachaturov

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  1. V. M. Kapralova
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  2. V. V. Zuev
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  3. A. I. Koltsov
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  4. S. S. Skorokhodov
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  5. A. S. Khachaturov
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Kapralova, V.M., Zuev, V.V., Koltsov, A.I. et al. Molecular dynamics of thermotropic liquid-crystalline polymer: Polydecamethyleneterephthaloyl-bis-4-oxybenzoate using2H NMR spectroscopy. Appl Magn Reson 1, 525–531 (1990). https://doi.org/10.1007/BF03166031

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  • DOI: https://doi.org/10.1007/BF03166031

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