Accession Number : ADA331657

Title :   A Fuel Generation Model for Char Forming Polymers in Fires

Descriptive Note : Final rept.

Corporate Author : FEDERAL AVIATION ADMINISTRATION WASHINGTON DC OFFICE OF AVIATION RESEARCH

Personal Author(s) : Lyon, Richard E.

PDF Url : ADA331657

Report Date : AUG 1997

Pagination or Media Count : 24

Abstract : A mass loss model for char forming polymers in fires is developed from mechanistic pyrolysis kinetics. Under conditions of flaming combustion the coupled rate equations for thermal degradation products and reactants reduce to a single rate law for the residual mass. Exact results are obtained from the mass loss history which include an equilibrium char yield whose value depends only on the relative rates of gas and char formation at a particular temperature. Reaction rate constants for thermolysis of chemical bonds, gas production, and char formation are determinable from parametric fits of the mechanistic charring model to thermogravimetric data. Predictions of the nonisothermal mass loss during constant heating rate experiments are in agreement with experimental data over the expected range of validity.

Descriptors :   *PYROLYSIS, *PHENOLIC PLASTICS, *FIRE SAFETY, REACTION KINETICS, POLYMERS, THERMAL DEGRADATION, FLAMMABILITY, TRIAZINES, CHARRING, COMBUSTION PRODUCTS, THERMOGRAVIMETRIC ANALYSIS.

Subject Categories : Physical Chemistry
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE