STRUCTURE OF THE RESIDUAL CARBON MADE BY FLUOROCARBON PYROLYSIS

Article abstract of DOI:10.1007/BF00743579

Fluorocarbon defluorination products show an anusual temperature dependence for the paramagnetic susceptibility in the range 77-300 K after pyrolysis at 650-1000 deg C, which is explained from dynamic equilibrium between the formation and dissociation of free radicals involving a bond eergy of 11.22 kJ/mole.The ESR line width initially increases with temperature but then decreases.The width of the inhomogeneously broadened line has been calculated as a function of the frequencies of the static and dynamic spin exchange, which shows that at low temperatures there is alocal increase in the radical concentration, but at higher temperatures, the dynamic exchange averages out this dipole spin-spin interaction.A suggestion confirmed by x-ray structures analysis is that the products contain a linear form of carbon.