Thermal properties and the flame retardancy of polypropylene/wood flour (PP-WF) composite were improved by adding aluminum hydrogen phosphonate (AHP) and triphenyl phosphate (TPP) flame retardants. PP-WF composites containing 30 wt% of AHP and 30 wt% of TPP achieved UL-94 HB standard with the horizontal burning rate of 20.8 mm/min and of 11.5 mm/min, respectively. Thermal properties of PP-WF composite with and without flame retardant, as well as the interaction between PP-WF and flame retardant were investigated through TGA analysis. The flame retardant mechanism is mainly in condensed phase for AHP and in gas phase for TPP. The residual char after the decomposition of PP-WF/AHP composite was analyzed by FTIR to understand how the formation of char affected on the flame retardancy and thermal stability PP-WF composite.

加入磷酸氢铝（AHP）和磷酸三苯酯（TPP）阻燃剂可改善聚丙烯/木粉（PP-WF）复合材料的热性能和阻燃性。包含30 wt％的AHP和30 wt％的TPP的PP-WF复合材料达到UL-94 HB标准，水平燃烧速率分别为20.8 mm / min和11.5 mm / min。通过TGA分析，研究了具有和不具有阻燃剂的PP-WF复合材料的热性能，以及PP-WF与阻燃剂之间的相互作用。阻燃机理主要针对AHP的冷凝相和针对TPP的气相。通过FTIR分析了PP-WF / AHP复合材料分解后的残留炭，以了解炭的形成如何影响PP-WF / AHP复合材料的阻燃性和热稳定性。