Inhibition Effects on Extinction of Polymer Burning PDF Download

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Book Description
The opposed flow diffusion flame has proven a useful laboratory tool for the study of the combustion of both liquids and solids. Quantitative determinations of burning rates, extinction limits, mass transfer numbers, solid fuel thermal diffusivities, and flame structures have been obtained under well-controlled and reproducible conditions, Holve and Sawyer (1975), T'ien, et al. (1976). Extinction limits are of particular interest, especially in assessing inhibitor addition. Extinction data reveal the effect of inhibitors on the chemical reaction rate. In this study inhibitors have been added to both the gaseous oxidizer and the solid fuel. Extinction data have been obtained for polyethylene (PE) and poly(vinyl chloride) (PVC) in N2/O2 mixtures. These data are compared to extinction measurements of polyethylene with an N2/O2/HCl mixture. Poly(vinyl chloride) differs chemically from polyethylene only by a substitution of a chlorine atom for a hydrogen atom in the monomer. With the inclusion of this halogen atom, poly(vinyl chloride) may be thought of as an ''inhibited'' polyethylene and therefore well suited for a comparative study. The behavior of the HCl added to the oxidizer side of the diffusion flame was found to be primarily that of an inert, in comparison to Cl being added to the fuel side of PVC. Impurities in this commercial PVC and PE may have had an effect on the extinction data.