Fluoroalkyl macroradicals

Exposure of fluoroalkyl macroradicals at 25-250 °C to NO does not produce nitrogen-containing radicals,... 

This mechanism explains why ARs are formed in TFE-HFP samples irradiated in a vacuum and in air. The CF -NO -CFj radicals can be formed by interaction between the CF3 radical and the terminal nitroso compound CF3-N=0 or between the CF3NO and terminal fluoroalkyl macroradicals CF -CF. The scheme of the process presented below along with reactions explains radical formation in the system under the action of light [49] ... 

To predict the stability of fluorinated polymers in the atmosphere polluted with nitrogen oxides, the ratio of rates of peroxynitrates in polytetrafluoroethylene (PTFE) by two mechanisms has been determined [19]. Chain peroxide radicals R 02 were obtained by photolysis of PTFE powder in a vacuum with the subsequent oxidation of fluoroalkyl macroradicals. The end peroxide radicals R 02 were generated by photolysis of the R 02 containing PTFE in the air. The exposure of PTFE samples containing chain or end peroxide macroradicals to NO2 results in decay of these radicals. The kinetics of the decay of peroxide radicals of both types is practically identical, and is likely to be determined by the rate of diffusion of NO into the... 

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See also in sourсe #XX -- [ ]

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