Etude de la télomérisation de C2F4 avec les iodures de perfluoroalkyle Partie I. Télomérisation radicalaire

Abstract The remomerization of C 2 F 4 with C 6 F 13 F by various initiators has been achieved. These results have shown the effect of the temperature on the mechanism of the reaction. With t -butylperoxide (DTBP) at 130°C, we have observed that the apparent relative reactivity of C 8 F 17 I (monoadduct) is constant versus time. On the contrary, with cyclohexyl percarbonate(CHPC) at 47°C, it decreases continuously. On the other hand the ratio of the initial rates of consumption of monomer to telogen is close to 1 at high temperature while it is near to 2 at low temperature. These results clearly demonstrate that the mechanism proceeds by monoaddition in the first case (DTBP) while it is by propagation in the second case (CHPC). Secondly, we have proposed a mathematical simulation of these two kinds of reaction and discussed the validity of these laws.