REACTION ANALYSES OF DIRECT SYNTHESIS OF PITCH FLUORIDE IN SOLID-STATE

Pitch fluoride is a new fluorine carbon compound which has superior wa ter repellency with a contact angle larger than 145 degrees. Adopting high softening point pitch as a raw material, we measured the reaction rate of direct fluorination of pitch under a fixed partial pressure o f fluorine gas by using a thermobalance, which was designed with speci al care for the safe treatment of fluorine gas, and we investigated th e properties of synthesized fluorine carbon by F-19-NMR, IR, and eleme ntal analysis. These analyses showed that at the same reaction tempera ture, synthesized pitch fluoride had almost the same properties irresp ective of fluorine gas pressure, and that the ring opening reaction of carbon-carbon bonds took place when the reaction temperature exceeded 90 degrees C. The fluorination rate was approximately in proportion t o the 0.5 power of the fraction of unreacted carbon and the concentrat ion of fluorine gas, and the rate constant was expressed by an Arrheni us type equation with extraordinarily small activation energy.