Formation of nitroxyl macroradicals in the tetrafluoroethylene-hexafluoropropylene copolymer by free-radical reactions in the presence of nitrogen oxide

Methods for obtaining the spin labels (nitroxyl macroradicals) in the tetra fluoroethylene-hexafluoropropylene copolymer were developed. The radicals a re formed by thermal or photochemical free-radical reactions of the product s of the interaction of alkyl and peroxide macroradicals with nitrogen oxid e. Two types of spin labels, containing the paramagnetic fragment in the mi ddle or at the end of the macromolecule, are obtained: R-F'-CF2-N(O) over d ot-CF2-R-F" and R-F'-CF2-N(O) over dot-CF3. The range of their thermal stab ility and parameters of their EPR spectra are determined.