FORMATION MECHANISM OF POLYACRYLONITRILE BASED BIOTOGICAL CARBON FIBER(II) --EFFECT OF CARBONIZATION AND ACTIVATION

The biological carbon fiber (BCF) were prepared from Polyacrylonitrile (PAN) fiber. The relationship among activator, heat treatment parameter to effect morphological structure, chemical constitute of BCF and adsorptivity, mechanical properties, electric conductivity of BCF were systematically characterized in the continuous carbonization and activation process by means of X ray, electrical resistively, elemental analysis, IR, specific surface area as well as mechanical testing. The experimental results show 1) as a activator, acetic acid can be used to prepare BCF with good combination properties; 2) change of combination properties such as yield, mechanical properties, characterization of adsorption and electric conductivity is closely related to that of heat treatment temperature, time and activator; 3) chemical component, diameter, orientation indices, crystallite size, morphological structure, mechanical properties and adsorptivity of BCF all emerge different change speed both in 500?℃ and before or after activity. In order to improve combination properties of BCF, it is crucial to controll the change speed of fiber structure in these two regimes..