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

Abstract

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, L_c, was below 11nm. Moreover, many structural defects could be seen in stacking layers of polygonal particles. On plotting of log L_c vs d₀₀₂ for the soots heat treated at various temperatures, a straight relationship was observed at the region of d₀₀₂>0.3425nm.