Pyrolyse du polyacrylonitrile—II. Etude des effets thermiques jusqu'à 350°C

Low temperature thermal effects (below 350°C) on the pyrolysis of polyacrylonitrile have been studied by differential thermal analysis and microcalorimetry. The role of pretreating the sample in helium or air has been especially examined together with the influence of temperature and time of pretreatment. Under helium at 200–210°C, the subsequent thermal effect is reduced. Under air however no change is observed in the thermal effect although it appears to be spread over a much longer time. It therefore appears possible to minimize the heating power and its consequences by pretreating the fibre at ca. 210°C under air.