Abstract
AbstractIn this study, we evaluated the interest of combining magnesium hydroxide (MDH) and lignin for developing complementary flame retardant actions in poly(ethylene-co-vinyl acetate) (EVA). Lignin was selected owing to its char forming ability thatwas supposed to reinforce the endothermic effect provided by MDH. The effect of lignin chemical modification by ammonium phosphate functions also evaluated as a way for enhancing its charring effect. Fire properties and thermal behavior of EVA composites were characterized using cone calorimeter, Pyrolysis Combustion Flow Calorimeter (PCFC) and thermogravimetric analysis (TGA). The effect of the incorporation of lignin alone on EVAcomposite thermal and fire behavior first evaluated. Results evidenced that the incorporation of lignin, whatever its nature, induced important reduction of composite thermal stability during TGA analysis as well as significant reduction of the time to ignition (TTI) in cone calorimeter test. However, a significant reduction of peak of heat release rate (pHRR), higher than that obtained with MDH was observed. The combination of lignin and MDH was led to further reduction of pHRR. Furthermore, it was concluded that the chemical modification of lignin is not required prior obtaining improved flame-retardant properties.
Highlights
In this study, we evaluated the interest of combining magnesium hydroxide (MDH) and lignin for developing complementary flame retardant actions in poly(ethylene-co-vinyl acetate) (EVA)
Results evidenced that the incorporation of lignin, whatever its nature, induced important reduction of composite thermal stability during thermogravimetric analysis (TGA) analysis as well as significant reduction of the time to ignition (TTI) in cone calorimeter test
EVA/magnesium dihydroxide (MDH)/lignin composites were prepared by melt blending and their thermal stability, flammability and fire properties were investigated by thermogravimetric analysis (TGA), pyrolysis combustion flow calorimetry (PCFC) and cone calorimetry
Summary
Abstract: In this study, we evaluated the interest of combining magnesium hydroxide (MDH) and lignin for developing complementary flame retardant actions in poly(ethylene-co-vinyl acetate) (EVA). Using bio-based product as flame retardant additives for polymeric materials attracted a lot of interest during the last decade [21] Some biomass constituents, such as lignin [22, 23], cellulose [24], phytic acid [25], are predisposed to form an important quantity of char during their combustion. Study focused on the effect of combining MDH with lignin, on thermal degradation and flame-retardant behavior of EVA based composites. EVA/MDH/lignin composites were prepared by melt blending and their thermal stability, flammability and fire properties were investigated by thermogravimetric analysis (TGA), pyrolysis combustion flow calorimetry (PCFC) and cone calorimetry. Scanning Electron microscopy (SEM) was used to characterize lignin particles dispersion state in the composites
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