Abstract:

A novel reactive flame retardant, 5,5-dimethyl-2-phospha-1,3-dioxan-2-yl-allyl phosphate, was synthesized by reacting neopentyl glycol, phosphorus oxychloride, allyl alcohol with sodium through two steps. The title compound was characterized by elemental analysis, FTIR, MS and 1H NMR. The thermal properties of the title compound were studied by TG and DSC techniques. The results show that the synthesized compound is consistent with the expected structure. The yield of the compound is 55.5% with the molar ratio of allyl alcohol to sodium being 2∶1, the reaction temperature being at 0 ℃ using an ice bath for 2 h at first, and then at 30 ℃ for 6 h. The TG curves show that the initial thermal decomposition temperature of the compound is about 130.2 ℃, and there is about 23% char residue left at 800 ℃, indicating that the title compound has a good thermal stability and a char forming capability.

Key words: neopentyl glycol, phosphorus oxychloride, flame retardant, allyl alcohol, thermal property