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The study of rotational mobility of stable nitroxyl radicals in polyvinylacetate

โœ Scribed by A.M. Wasserman; T.A. Alexandrova; A.L. Buchachenko

Publisher
Elsevier Science
Year
1976
Tongue
English
Weight
309 KB
Volume
12
Category
Article
ISSN
0014-3057

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โœฆ Synopsis

Abstrac~Analyses of the rotational diffusion characters of free and bonded nitroxyt radicals in polyvinylacetate were carried out. The radical rotational character essentially depends on the molecular sizes of the radicals. The movement of the "small" radical is matched by the arbitrary jump tumbling model. The rotation of the "large" radical (both probe and label) occurs by the Brownian rotational diffusion mechanism. The correlation times in the slow-motion region are calculated by taking into account the radical rotation mechanism. Comparison of the r, values for the free and bonded radicals with those obtained by the NMR technique shows that movements of the spin probes and labels depend not only on the short polymer segments but on other factors also.

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