Novel Phosphalated Phosphazene: Research In Their Preparation And Properties

Based on lots of published papers either domestic or overseas, novel phophorylated phosphazene compounds were synthesized successfully in indirect and direct ways respectively. The phosphate compound DOPO was induced by two steps. 4-hydroxybenzaldenhyde (4-HBA) reacted with hxacyclorotriphosphazene(HCCP)through nuclioatric substitution reaction first, and then continued to react with DOPO by additive reaction to give THBDO. The thermal stability of THBDO was evaluated accordingly.Another way to induce phosphate compound into the phosphazene system directly by the reaction between hexacyclorotriphosphazene (HCCP) with 2 equiv of 2,2'-dihydroxybiphenyl produced one of the reagents [N₃P₃Cl₂(O₂Cl₂H₈)₂](DCCP),and Diphenyl chlorophosphate with ethanol gave the other reagent [C₂H₅OP(O₂Cl₂H₈)₂](DPEP). And then DCCP reacted with DPEP at 210℃under magnetic stirrer in nitrogen atmosphere to give a new type of phospazene compound [N₃P₃(OP(O₂Cl₂H₈)₂)₂(O₂Cl₂H₈)₂](DPPPZ). The product was characterized by 31P-NMR, 1H-NMR spectroscopy , elemental analysis. Its thermal degradation behavior was investigated with TGA with onset temperature 330.6℃. The combustion behaviors of these DPPPZ-PC samples were evaluated by the UL-94 test on a CZF-3 type instrument, and with the content of 12 wt%, the blends passed V-0 for UL-94 test.