Tubular one-dimensional poly (cyclotriphosphazene-melamine) (PHMA) sub-microtubes were conveniently synthesized from co-polymerization of hexachloro -cyclotriphosphazene and melamine. The SEM and TEM results showed PHMA sub-microtubes were opened at one end with diameters of 100–300 nm and lengths of 1–10 μm. The inner diameters of closed and open end were 10–30 nm and 50–100 nm, respectively. The PHMA sub-microtubes were melt blended with PET (PET/PHMA) to be used as an effective flame retardant. The flame-retardant and anti-dripping properties of PET/PHMA composites were evaluated by TGA, LOI, vertical burning, MCC and rheological test. The results confirmed the efficiency of PHMA in enhancing the self-extinguishing ability and inhibiting melt-dripping of PET. The morphological characteristics and graphitic structure of the charred residues were evaluated by SEM, Raman spectroscopy. Results demonstrated the formation of a compact protective carbon layer and a carbonaceous micro-structures, which acted as insulator against oxygen and heat.

通过六氯-环三磷腈和三聚氰胺的共聚，可以方便地合成管状一维聚（环三磷腈-三聚氰胺）（PHMA）亚微管。SEM和TEM结果显示PHMA亚微管的一端开口，直径为100-300 nm，长度为1-10μm。封闭端和开口端的内径分别为10–30 nm和50–100 nm。将PHMA亚微管与PET（PET / PHMA）熔融共混，以用作有效的阻燃剂。通过TGA，LOI，垂直燃烧，MCC和流变测试评估了PET / PHMA复合材料的阻燃性和抗滴落性能。该结果证实了PHMA在增强PET的自熄能力和抑制PET的熔融滴落方面的效率。通过SEM，拉曼光谱法评价烧焦残渣的形态特征和石墨结构。结果表明形成了致密的保护性碳层和碳质微结构，可作为氧气和热量的绝缘体。