Abstract
Spectroscopy with saturation transfer was used to widen the range of correlation times of rotation of spin probes in polymers that can be reliably determined in the range of “super-slow” motion. Results obtained by two methods of recording ESR spectra under conditions of super-high-frequency saturation (by a first and second harmonic of the absorption signal) agree in practice. The Arrhenius equation holds over a wide range of temperature and correlation time (10 −10–10 −5 sec) of the rotation of probes. A combination of methods of saturation and traditional methods using a spin probe enables wide distribution to be observed according to correlation times near and below T g of polymers. Comparison with frequencies of relaxation processes shows that rotation of the probe is determined by small-scale dynamics of polymer chains.
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