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The thermal behaviour of n-Tetracosane and low molecular weight Polyethylene studied by NMR and a refined Brillouin scattering technique

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Summary

A new type of Brillouin spectrometer has been used to show that transition-like phenomena exist in the melt of low molecular weight Polyethylene (Mn=2230). Because of the enhanced accuracy of the new spectrometer it could be shown that the sound velocity gradient is a constant above and below Tu=436 K in a wide temperature range, but is discontinuous at Tu. The same hypersonic behaviour has been found for MBBA at the nematic-isotropic-transition. NMR investigations have confirmed the existence of Tu previously reported for n-Tetracosane (C24H50).

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Authors and Affiliations

  1. Fachbereich Physik der Universität des Saarlandes, Bau 38, 6600, Saarbrücken, Federal Republic of Germany

    J. K. Krüger & H. -G. Unruh

  2. Sektion Kernresonanzspektroskopie, Universität Ulm, 7900, Ulm, Federal Republic of Germany

    R. Kimmich

  3. RCA-Laboratories, 8048, Zürich, Switzerland

    J. Sandercock

Authors
  1. J. K. Krüger
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  2. R. Kimmich
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  3. J. Sandercock
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  4. H. -G. Unruh
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Krüger, J.K., Kimmich, R., Sandercock, J. et al. The thermal behaviour of n-Tetracosane and low molecular weight Polyethylene studied by NMR and a refined Brillouin scattering technique. Polymer Bulletin 5, 615–621 (1981). https://doi.org/10.1007/BF00255301

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  • DOI: https://doi.org/10.1007/BF00255301

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