A novel mono-component intumescent flame retardant, ETA-APP, was used to flame-retard PP/ramie fiber (PP/RF) composite. Scanning electron microscope (SEM) and energy dispersive X-ray (EDX) illustrated that core-shell RFs were in-situ formed in PP/RF/ETA-APP composite after melt blending. The resulting PP/RF/ETA-APP composite had much better flame retardancy than PP/RF containing a traditional highly-efficient intumescent flame retardant (IFR). The in-situ accumulated ETA-APP at the surface of RF was charred during the combustion process, and the formed char layer efficiently prohibited the combustion-supporting "wicking action". Therefore, the highly-efficient flame retardation of PP/RF/ETA-APP was achieved.
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