Abstract
The 13 C CPMAS NMR spectrum and the temperature dependence of the 1 H rotating-frame spin-lattice relaxation have been studied for poly(ethylene oxide) (PEO). Correlation times for the chain mobility have been derived from the relaxation data between the glass-transition temperature and the melting point of PEO. These data demonstrate that the rate of motion is about 100 times higher in the amorphous phase than in the crystalline phase. The very different 1 H relaxation behavior of amorphous and crystalline PEO is used to assign the two components observed in the 13 C spectrum and to study the phases separately
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