Abstract
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.
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