Abstract
In this article, the limiting oxygen index (LOI), UL-94 test, and cone calorimeter test (CCT) were used to study the combustion behaviors of polypropylene (PP)/magnesium hydroxide (MH)/expandable graphite (EG) composites and the synergistic flame-retardant effects of EG with modified MH on PP. The residues from the composites were characterized by X-ray photoelectron spectroscopy (XPS). The experimental results showed that the particle size of EG had a great effect on the flammability of the PP/MH/EG composites. The data obtained from the CCT indicated that the heat release rate (HRR), the effective heat of combustion (EHC), and the mass loss rate (MLR) of PP/MH/EG composites decreased markedly with decreasing particle size of EG. XPS data indicated that EG could efficiently improve the char layer structure and flame retardancy of the composites.
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