Abstract
Abstract The selective spin labelling of polypropylene films for monitoring the molecular dynamics at the oxidation sites has been obtained by reacting 3-chloroformyl-2,2,5,5-tetramethylpyrroline-1-oxy1 with the OH groups formed in the photo oxidation. The line shape changes of the ESR spectrum of the spin label, detected as a function of the temperature, have been interpreted in terms of a very anisotropic motion with fast rotation about a molecular axis oriented approximately along the N-O bond; also evidence of the presence of two different populations of nitroxides with different mobilities has been obtained. The use of sulphonyl radicals as novel probes for molecular motion in polymers has also been tested.
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