Graphitization Behavior of the Soot Produced by Burning of the Cure Mixture of NH4ClO4/HTPB

The particle feature and the graphitization behavior were studied for the soot produced by burning of the cure mixture of NH4ClO4 and hydroxyterminated polybutadiene (HTPB) under N2 gas pressure of 0.49 and 6.9 MPa. The soot particles appeared cluster including chain-like structure. The size of particles and the distribution of carbon layer segments of the soot depended on the HTPB content and the burning pressure. The pattern of gathering of carbon layer segments was irregular very much when the large content of resin and low burning pres-sure were applied. The structural change and shape change from spherical to polygonal were remarkable when the soot was heat-treated at the temperature above 1500°C. At a heat treat-ment temperature (HTT) of 2800°C, the value of interlayer specing, d002, was more than 0.3425nm, and that of the crystallite size, Lc, was below 11nm. Moreover, many structural defects could be seen in stacking layers of polygonal particles. On plotting of log Lc vs d002 for the soots heat treated at various temperatures, a straight relationship was observed at the region of d002>0.3425nm.