中文摘要：

以尼龙6（PA6）为基体材料，以多聚磷酸蜜胺（MPP）／双磷酸哌嗪为复合阻燃剂制备无卤阻燃PA6复合材料。采用扫描电镜观察了无卤阻燃PA6复合材料燃烧物表面的炭层形貌，分析了阻燃剂在PA6中的阻燃机理，研究了MPP用量对无卤阻燃PA6复合材料阻燃性能和流变行为的影响。结果表明：MPP质量分数为10％时，无卤阻燃PA6复合材料的极限氧指数达到33．8％，燃烧热为24．96kJ／g，燃烧后残留物质量保留率为18％。流变研究表明，随着MPP用量增大，无卤阻燃PA6复合材料的表观黏度降低。随着MPP用量增大，促进了燃烧炭层生成，产生了良好的阻燃协同作用。

英文摘要：

Halogen-free flame-retardant nylon 6 （PA6） composite was prepared by u- sing PA6 and melamine polyphosphate （MPP） and piperazine diphosphate as composite flame retardant. The carbon layer surface morphology of halogen-free flame-retardant PA6 composite was observed by scanning electron microscope after combustion. The flame re- tarding mechanism of flame retardants in PA6 was also analyzed. The influence of MPP content on flame retardant property, rheological property and thermal decomposition be- havior of halogen-free {lame-retardant PA6 composite was studied. The results showed that limit oxygen index was 33. 8~,and combustion heat was 24. 96 kJ/g,and residue content after combustion was 18%, when MPP mass fraction is 10%. Furthermore, the rheological studies showed that apparent viscosity of halogen-free flame-retardant PA6 composite decreased with MPP content increasing. The surface morphology of halogen- free flame-retardant PA6 composite after combustion showed that carbon layer was formed with the increasing of MPP content, which tends to cooperate with flame retar- ding after combustion.