ABSTRACT
Spin probe technique became an effective research method of particle dinamics in polymers in the late 1960’s as a result of the development of chemistry and physics of nitroxide radicals. Electron spin resonance (ESR) spectroscopy method is a most common method of that type. Stable nitroxide radicals are usually used as probes. The spin probe technique is widely spread in studies of macromolecular systems. The structure of stable nitroxide radicals is rather diverse, although all of them contain a paramegnetic fragment as a structural element, included in most cases into a six- or five-unit cycle, and shielded by four methyl groups. ESR spectra of these compounds in diluted nonviscous solutions consist of three narrow lines of hyperfine structure, owing to interaction of an unpaired electron with a nitrogen nuclear spin.
