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A highly flame‐retardant PP composite powder suitable for selective laser sintering (SLS) was prepared successfully by mechanical blending, which was composed of pure PP, piperazine pyrophosphate (PPAP), melamine polyphosphate (MPP), and triazine‐based charring‐foaming agent (CFA). The results showed that the flowability of PP composite powder decreased by about 40% and the DSC data indicated the...
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