Enhancing the high temperature resistance of nanocomposite materials through dimethyl methyl phosphate impregnation-coating treatment

In order to enhance the thermal stability of polyvinyl alcohol (PVA), a modification scheme involving a dimethyl methyl phosphate (DMMP) impregnation-coating treatment was adopted in this article. Initially, the interfacial compatibility of DMMP with PVA was characterized using scanning electron microscopy (SEM), inductively coupled plasma spectroscopy, elemental analysis and Fourier transform infrared spectroscopy (FTIR). Subsequently, the pyrolysis and combustion properties of DMMP-coated PVA were evaluated via non-isothermal thermogravimetric experiments and cone calorimeter tests. The pyrolysis products were then analyzed using a combination of thermogravimetric infrared chromatography and pyrolysis gas chromatography/mass spectrometry (Py-GC/MS). Finally, a reaction model function closer to the actual co-pyrolysis mechanism at high temperatures was established through thermal kinetics. The results indicated that the impregnation-coating treatment could effectively distribute the DMMP molecules on the surfaces of PVA particles. Meanwhile, the DMMP coating could clearly slow the peak degradation rate of PVA grains and inhibit the combustion of PVA under fire conditions. Furthermore, the pyrolysis of DMMP-coated PVA resulted in the formation of over 40 distinct compounds. The kinetic analysis revealed that the reaction model function established in this article could better characterize the actual reaction mechanism of the co-pyrolysis of DMMP and PVA. Graphical