Effect of moisture content on the flammability of some organic dusts

Thermal decomposition kinetic and flame retardancy of CaCO3 filled recycled polyethylene terephthalate/recycled polypropylene blend

“…The thermograms of CaCO 3 filled blends featured in Figure 2 show single-step degradation when they were exposed to nitrogen. Meanwhile, the appearance of a second step in the thermogram corresponds to the conversion of the ash to CO 2 or CO. 23 The incorporation of CaCO 3 resulted in the decomposition of the ash at lower temperatures, which highlights the catalytic effect of the filler. The onset degradation temperature of the blend would shift slightly to a higher temperature with increasing CaCO 3 content.…”

“…The residual corresponds to the CaCO 3 content and some ash from the polymer. 23,24 Tables II and III tabulate the onset and peak degradation temperatures of unfilled and CaCO 3 filled RPET/ RPP blends. It indicates that CaCO 3 has the potential to improve the thermal degradation resistance of the blend.…”

“…This flammability of the blends would significantly limit their applications. In addition, Tsvetkov et al 23 have reported that water behave as inert diluents, which could evaporate from the surface of organic particles during combustion, therefore substantially depleting the oxygen supply and markedly reduce the rate of the combustion process. Flame retardant property of CaCO 3 filled RPET/RPP blend was investigated by measuring the limiting oxygen index (LOI), which is defined as the minimum concentration of oxygen in an oxygen-nitrogen mixture, required to just support downward burning of a vertically mounted test specimen.…”

“…[16][17][18][19][20][21][22][23][24] Flame retardant materials for thermoplastics can be classified as halogenated compounds, phosphorous compounds, metallic oxides and inorganic fillers. Therefore, it is flame ratardant polymeric materials typically possess traits such as the ability to prevent extensive combustion, increase ignition resistance, and reduce the spreading of flame.…”

“…Therefore, it is flame ratardant polymeric materials typically possess traits such as the ability to prevent extensive combustion, increase ignition resistance, and reduce the spreading of flame. [16][17][18][19][20][21][22][23][24] Flame retardant materials for thermoplastics can be classified as halogenated compounds, phosphorous compounds, metallic oxides and inorganic fillers. The mechanisms of flame retardant are endothermic degradation such as magnesium and aluminum hydroxides, dilution of filler by fillers such as talc or calcium carbonate, thermal shielding by using intumescent additive, or gas phase radical quenching such as brominated and chlorinated materials.…”