Etude cinetique par RPE de la deshydrogenation thermique du polyacrylonitrile

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The study of a remarkable property of the paramagnetism of PAN pyrolyzates has allowed following of the kinetics of dehydrogenation of a PAN homopolymer as well as oxygen binding on these pyrolyzates and to determine the kinetic and thermodynamic parameters of these two processes. The dehydrogenation of PAN, which occurs even in the absence of oxygen, occurs immediately after the thermal cyclisation of nitrile groups; it creates conjugated double bond systems (responsible for the paramagnetism) simultaneously with electron donor centres (responsible for the semi-conducting and catalytic properties) where molecular oxygen can be adsorbed, thus partially diminishing the paramagnetism.