Perfluoroalkylation of graphitic carbon black: synthesis and thermal properties

摘要

Perfluorodiacyl peroxides are suitable tools for the covaient linkage of fluorinated groups on substrates containing aromatic moieties. The thermal decomposition process of such fluorinated peroxides allows the covalenf linkage of fluorinated radicals on the poiycyclic aromatic structure of a graphitic carbon black. Depending on the perfluorodiacyl peroxide involved during the chemical treatment, several fluorinated chains, i.e. perfluoroethyl, CF3CF_(2-), perfluoro-n-propyl, CF3CF2CF2- and perfluoro-iso-propyl, (CF3)2CF-residues have been bonded covalentiy on the surface of a conductive carbon black. At the characteristic temperature of perfluorocarbons thermolysis (400°C), thermogravimetric analyses revealed weight losses in agreement with the fluorine contents on the modified carbon blacks.