Dynamic weight loss values

For flaming combustion, the - AH and the rate of producton of the volatiles are important. The latter value could be determined by thermogravimetry and its derivative under simulated pyrolysis conditions, which indicate the progress and the rate of weight loss. Figure 26 shows the dynamic TG of cottonwood and its components and indicates that lignin contributes mainly to char, whereas cellulose and hemicelluloses form mainly the volatile pyrolysis products that are responsible for the flaming combustion. These data also indicate that wood shows the collective thermal properties of its components. 

The linear viscoelastic properties of all samples were characterized by dynamic shear measurements in the parallel-plate geometry. Experimental details have been previously published [9]. Using time-temperature equivalence, master curves for the storage and loss moduli were obtained. Fig. 1 shows the master curves at 140°C for the relaxation spectra and Table 3 gives the values of zero-shear viscosities, steady-state compliances and weight-average relaxation times at the same temperature. 

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