中文摘要：

采用羟基磷灰石（HAP）改善聚丙烯（PP）／膨胀阻燃剂[IFR，聚磷酸铵（APP）／季戊四醇（PER）的质量比为3：1]复合材料的阻燃性能。采用垂直燃烧、极限氧指数、热失重分析等手段研究了其阻燃性能和热性能。采用扫描电子显微镜（SEM）和X射线光电子能谱（XPS）仪对炭层的形貌和结构进行了研究。结果表明，HAP对IFR有一定的协同作用。＇-3添加质量分数为0．5％的HAP和19．5％的IFR时，阻燃PP复合材料的极限氧指数达到29．9％，并且垂直燃烧达到了UL94v_0级别。然而随着HAP含量再继续增加，复合材料的阻燃性能又开始下降。SEM分析表明，少量HAP的加入提高了炭层对气体和热量的阻隔效率；XPS分析表明，HAP并未改变炭层的化学结构。此外，热失重分析表明，HAP增加了复合材料在800℃时的质量残留量。

英文摘要：

Hydroxyapatite（HAP） was introduced into polypropylene（PP） / intumescent flame retardant（IFR） composites to strengthen their flame retardant properties. The vertical buming test, limiting oxygen index （LOI） and thermogravimetic（TG） analysis were used to investigate their flame retardancy and thermal stability. Scanning electron microscope （SEM） and X ray photoelectron Spectroscopy（XPS） were used to study the morphology and chemical structure of char layer. The results show that good synergistic effect existed between HAP and IFR at a suitable condition. LOI value can be increased to 29.9 % and UL94 V-0 level can be obtained for the composites with the mass fraction of 0.5% HAP and 19.5% IFR. As the content of HAP increases, the flame retardancy of the composites decreases. SEM analysis results show low content of HAP helps char layer to hinder the heat and gas. XPS analysis results show HAP do not change the chemical structure of char layer. In addition, the HAP increases the char layer residues of the composites at 800 ℃ in TG analysis test.