Thermal destruction experimentation results

The successful scale-up of advancement and modification of rubber-modified epoxy resins is discussed. Mechanisms are proposed for both advancement and esterification reactions as catalyzed by triphenylphosphine which are consistent with experimental results. A plausible mechanism for the destruction of the catalyst is also presented. The morphology of these materials is determined to be core-shell structures, dependent upon composition and reaction and processing conditions. Model studies have been performed to determine the effects of thermal history on the kinetics of reaction. These efforts have resulted in the successful scale-up and use of rubber-modified epoxy resins as functional coatings in the electronics industry. 

Experimental and theoretical studies are presented from a laboratory-scale thermal destruction facility on the destructive behavior of surrogate plastic and nonplastic solid wastes. The nonplastic waste was cellulosic while the plastic waste contained compounds such as polyethylene, polyvinyl chloride, polystyrene, polypropylene, nylon, rubber, and polyurethane or any of their desired mixtures. A series of combustion tests was performed with samples containing varying composition of plastic and nonplastic. Experimental results are presented on combustion parameters (CO, excess air, residence time) and toxic emissions (dioxin, furan, metals). 

Analysis and interpretation of the data reveal the effect of waste feed composition on combnstion parameters and dioxin, fnran, and metals emission. Equilib-rinm calculation results are used to describe the experimentally observed trends for the thermal destruction behavior of these wastes. The results show significant influence of plastic on combnstion characteristics, and dioxin, furan, and metals emission. 

The experimental and numerical investigation described here explore the thermal destruction behavior of different plastic and nonplastic mixmres in a laboratory-scale facility and its effect on carbon monoxide, particulates, dioxin, furan, and toxic metals emission. The results show that the composition of the waste has a significant infiuence on the emissions characteristics. The results also show that by using a suitable combination of various components in the waste, enhanced burning of waste occurs with reduced toxic emissions and solid residues. 

These results show the favorable effect produced by increased rate of flow the ozone formed is more effectively removed from the destructive thermal or photochemical action, the more the flow rate is increased. These experimental conditions are unsuitable for powerful lamps where thermal decomposition is great but, on the other hand, when liquid oxygen is used the yields are considerably improved by using 350- or 450-watt lamps. The arrangement used is shown schematically in Figure 3. 

TeMN-4 also shows strong correlation with calculated %Rq up to 1.5%, but decreases at higher calculated %Rq values. The decrease may be due to lower stability of the 1,3,6,7-isomer at higher levels of thermal maturity or it may result from depletion of a TeMN-4 precursor at high maturity. There appears to be scatter in the TeMN-2 data at the highest %Rq values which may represent formation-destruction processes of the 2,3,6,7-TeMN isomer. The TeMNs are particularly attractive as maturity indicators because they persist at high experimental temperatures. 

Neither the actual mechanism of short circuit initiation nor the mechanism by which an internal short leads to a thermal runaway is fully understood yet. After the fact, postmortems show a level of destruction that renders it impossible to ascertain the exact morphology that existed at the point of thermal runaway. We use experimental and simulation results to discuss the likely mechanism of short formation, and the factors that control thermal runaway following an internal short. 

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