A multistep kinetic process is postulated to describe the pyrolysis of nylon 6-6, phenolic CTL-91LD (a phenolic novalac resin), and their composites. Kinetic coefficients are derived from thermogravimetric analysis data (TGA) at heating rates varying from 3-60°C/min for each component. Three correlation techniques are used to obtain consistent coefficients. A two-step kinetic equation is derived to describe the phenolic pyrolysis and a single-step kinetic equation is found to adequately represent nylon 6-6 pyrolysis. These equations are then combined to obtain an overall pyrolysis rate equation for the composite.The derived rate equations for the individual components and the 1 : 1 composite are verified by comparing them with TGA data taken at rates of sample temperature rise varying from 3-1 OO"C/min. Predictions are made for isothermal pyrolysis of a 1:l composite. Weight-loss data for the nylon-phenolic composite, during both isothermal pyrolysis and pyrolysis at programmed rates of temperature rise, are accurately correlated by the multistep pyrolysis rate equation.

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