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Abstract
The reorientation of a spin probe strongly localized close to the ionic clusters of two different ionomers (one homopolymer and one block copolymer) is investigated by pulsed high-field electron spin resonance (ESR). The study profited from the excellent orientation resolution of the high-field ESR and detects the saturation recovery to measure the spin–lattice relaxation time T 1. Above the glass transition temperature, T 1 exhibits a new regime which exhibits the same features in both polymer phases under study. It is ascribed to the fast librations of the spin probe in the opening cage where it is hosted.
Acknowledgements
Financial support by the Deutsche Forschungs gemeinschaft (DFG) Schwerpunkt ‘Polyelektrolyte’ and the DFG Schwerpunkt ‘Hochfeld-EPR in Biologie, Chemie und Physik’ is gratefully acknowledged. The authors thank A. Eisenberg, S. Eaton and G. Eaton for helpful discussions and A.Kh. Vorobiev for a reprint of the paper by Vorobiev et al. (Citation2000).