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.
Cage effects on the librational motion in ionomeric homopolymers and block copolymers
LEPORINI, DINO;
2004-01-01
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.File in questo prodotto:
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