Study on thermal decomposition kinetics of N,N′-bis(5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl)ethylenediamine in air

Abstract

The thermal decomposition kinetics of the N, N¢-bis(5,5-dimethyl-2-phospha-2-thio-1,3-dioxan-2-yl) ethylenediamine (DPTDEDA) in air were studied by TG-DTG techniques. The kinetic parameters of the decomposition process for the title compound in the two main thermal decomposition steps were calculated through the Friedman and Flynn-Wall-Ozawsa (FWO) methods and the thermal decomposition mechanism of DPTDEDA was also studied with the Coats-Redfern and Achar methods. The results show that the activation energies for the two main thermal decomposition steps are 128.03 and 92.59 kJ$mol -1 with the Friedman method, and 138.75 and 106.78 kJ$mol -1 with the FWO method, respectively. Although there are two main thermal decomposition steps for DPTDEDA in air, the thermal decomposition mechanism of DPTDEDA in the two steps are the same, i.e. f(α) = 3/2(1 -α) 4/3 [(1 -α) -1/3 -1] -1 .

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

“…[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.…”