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Molecular order and dynamics of liquid crystal polymers studied by multipulse dynamic NMR techniques

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Rotational Dynamics of Small and Macromolecules

Part of the book series: Lecture Notes in Physics ((LNP,volume 293))

Abstract

Multipulse dynamic NMR has been established as a powerful tool for studying complex chemical and biological systems. Generally, variation of pulse sequence, pulse separation and magnetic field orientation provides the large number of independent experiments necessary for a proper molecular characterization of the systems. Analysis of these experiments in terms of molecular order and dynamics is conveniently achieved by employing a density matrix treatment, based on the stochastic Liouville equation. Arbitrary relaxation rates and lineshapes of single and multiple quantum transitions can be considered. In addition, our method of analysis is also applicable in the slow-motional and/or zero-field [66–68] region, where the conventional relaxation theories no longer apply.

The studies described here provide new information concerning the dynamical organization of liquid crystal polymers. There is evidence for high orientational and conformational order of the chain molecules in the anisotropic melt. From a dynamic point of view, the primary result is the detection of the dominant motions, such as chain rotation, chain fluctuation and chain isomerization in the various polymer phases. By employing multipulse dynamic NMR techniques, it is possible to follow these motions over an extremely wide dynamic range, extending from 10−10s in the liquid crystalline melt to 10−2s in the glassy stateo T1Z dispersion measurements, carried out over a frequency range of six orders of magnitude indicate that collective order fluctuations constitute a major relaxation mechanism in the kHz range.

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Authors and Affiliations

  1. Institut für Physikalische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-7000, Stuttgart 80, West-Germany

    K. Müller & G. Kothe

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  1. K. Müller
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  2. G. Kothe
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Th. Dorfmüller R. Pecora

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© 1987 Springer-Verlag

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Müller, K., Kothe, G. (1987). Molecular order and dynamics of liquid crystal polymers studied by multipulse dynamic NMR techniques. In: Dorfmüller, T., Pecora, R. (eds) Rotational Dynamics of Small and Macromolecules. Lecture Notes in Physics, vol 293. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0032722

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  • DOI: https://doi.org/10.1007/BFb0032722

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  • Print ISBN: 978-3-540-18688-5

  • Online ISBN: 978-3-540-48079-2

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