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Two-dimensional 13C NMR of highly oriented polyethylene

J. Chem. Phys. 66, 4919 (1977); doi:10.1063/1.433831

Issue Date: 1 June 1977

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Stanley J. Opella and J. S. Waugh
Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
The two-dimensional NMR procedure of separated local field spectroscopy [J. S. Waugh, Proc. Natl. Acad. Sci. USA 73, 1394 (1976)] is applied to fibers of highly oriented polyethylene. The 1H decoupled 13C chemical shift spectrum of the fiber oriented parallel to the external magnetic field is a single line, while a distinctive powder pattern results from the perpendicular orientation that is in excellent agreement with calculations. The 13C–1H dipolar splitting is 45 kHz at sigma33 and nonexistent at sigma22 consistent with perfectly aligned methylene groups with C–H bond length of 1.10 a.u. The splitting at sigma11 is somewhat reduced from the predicted value; this finding, along with the temperature invariance of parameters, is discussed in terms of the molecular disorder and motion of the polymer. The Journal of Chemical Physics is copyrighted by The American Institute of Physics.
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PACS

  • 76.60.Es
    Magnetic resonances and relaxation in condensed matter; Mössbauer effect Nuclear magnetic resonance and relaxation Relaxation effects
  • 36.20.Kd
    Studies of special atoms and molecules Macromolecules and polymer molecules Electronic structure and spectra
  • YEAR: 1977

PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
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REFERENCES (19)
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