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Relaxation spectrometry in solid polymers based on NMR and EPR measurements
Author(s) -
Kashiwabara Hisatsugu,
Shimada Shigetaka,
Hori Yasurō
Publication year - 1990
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19900340115
Subject(s) - relaxation (psychology) , electron paramagnetic resonance , activation energy , chemistry , polyethylene , spectral line , motional narrowing , nuclear magnetic resonance , nmr spectra database , nuclear magnetic resonance spectroscopy , analytical chemistry (journal) , physics , organic chemistry , psychology , social psychology , astronomy
Wide distribution of relaxation times is taken into consideration in determination of the activation energy of the molecular motion associated with the motional narrowings of line widths of magnetic resonance spectra. The molecular motion of rotational vibration around the chain axis of polyethylene in urea‐polyethylene inclusion complex is examined. Relaxation spectra can be obtained from the data of the motional narrowings of EPR and NMR by assuming the activation energy as a parameter. Also, the representative relaxation times corresponding to EPR and NMR observations can be estimated. These relaxation times give us an activation energy since EPR and NMR observations correspond to different time constants of observations. The activation energy estimated from the data of the representative correlation times is identical with the activation energy obtained as a parameter in determination of the identical relaxation spectrum from the data of motional narrowings of EPR and NMR observations.