Abstract
Broad-line proton magnetic resonance spectra were measured for urea-d4–polyethylene complex from 125 to 360 K. For comparison, the spectra of the extended-chain crystal of polyethylene, bulk polyethylene, urea-d4–C18H38 complex, and n-C18H38 were also examined. The NMR spectra of isolated polyethylene which has only an intra-chain interaction and no interchain ones were successfully observed for rigid and rotating states. From a comparison of the values of observed and calculated second moments, it was concluded that the polyethylene molecule is freely rotating in urea channels above the transition temperature. A portion of the polyethylene molecule is also freely rotating even 10 K below the transition temperature. The free rotation of guest molecules is probably the cause of the phase transition of urea complexes.
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Hori, Y., Tanigawa, T., Shimada, S. et al. A Nuclear Magnetic Resonance Study of Molecular Motion in Urea-d4–Polyethylene Complex. Polym J 13, 293–299 (1981). https://doi.org/10.1295/polymj.13.293
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DOI: https://doi.org/10.1295/polymj.13.293
