Thermal analytical studies on carbonization of Fe(NO3)3 or FeCl2 modified polyacrylonitrile.
RAPID COMMUNICATION (in English)
Carbonization of polyacrylonitrile (PAN) at temperatures up to 1000°C has been studied by DTG–DTA–MS methods in the presence of FeCl2 and Fe(NO3)3 incorporated on a molecular scale. The composition of efluent gases was different from that from the original PAN. The iron of the inorganic salt appears to have catalyzed the formation of a better organized carbon. The metal has enhanced the rate of alkaline nitrogen removal from the polymer and simultaneously shifted the DTA exotherm toward oderate temperatures. The anions coupled with the iron in the inorganic salts have also affected the carbonization. The chloride ion resulted in better organized carbons than did the nitrate and prevented high carbon losses due to CO or CO2