Abstract: Aluminum hydroxide (ATH) and/or ammonium polyphosphate (APP) was introduced into polylactic acid/bamboo flour (PLA/BF) composites to render it flame retarding and smoke inhibiting properties. Microscopic structure of the composites, tensile fracture surface, and combustion char layer the were observed by SEM. Mechanical properties, thermal stability, and combustion the performance were tested. ATH and/or APP decreased the mechanical properties of the composites but increased thermal properties. For systems containing ATH, APP, and ATH+APP, the char percentage on 600 ℃ achieved 20.3 %, 27.9 %, and 26.3 %, respectively. ATH provided a significant smoke inhibiting effect on the composite, but exhibited a larger heat release than APP. When both APP and ATH were introduced, the composites gave rise to both good heat inhibitory and smoke suppression.

Key words: poly（lactic acid）, bamboo flour, composite, mechanical property, flame retardant, smoke inhibition