环三磷腈衍生物的合成及其在PET阻燃中的应用

以含硅和硼元素的物质改性六氯环三磷腈，制备环三磷腈衍生物，通过傅里叶变换红外光谱和核磁共振等方法确定其结构。将衍生物以熔融共混的方法应用于聚对苯二甲酸乙二醇酯（PET）的阻燃研究，通过极限氧指数和垂直燃烧测试判定其在PET中的阻燃效果，协同燃烧后炭渣的表面形貌探讨其阻燃机理。结果表明，在阻燃剂的添加量仅为1%时，材料的极限氧指数能达30%以上，UL94可达V-0级的水平；材料燃烧后材料的内表面是多孔型的而外表面是连续致密的，为改善材料的热性质和降低可燃气体的扩散提供了一层屏障。

Synthesis and Application of Cyclotriphosphazene Derivative in PET

A novel flame retardant composed of hexachlorocyclotriphosphazene (HCCP) modified by silicon and boron moieties (HCCP-Si-B) was used as flame retardant for PET. The chemical structure of HCCP-Si-B was characterized by FTIR and NMR. The flame retardancy of PET was investigated by limited oxygen index and vertical burning test. SEM was used to investigate the morphology of the char residue. It showed that HCCP-Si-B had excellent flame retardant property,the sample achieved UL 94 V-0 rating and the limited oxygen index value more than 30% while the content of HCCP-Si-B was only 1%. The coat-like char formed in the outer char surface of composites and many micro porous cells in inner surface. Such a structure provided a barrier for the PET material during burning.