The novel flame retardant 1,3,5-tris(5,5-dimethyl-1,3-dioxa-2-oxophosphorinanyl-2-oxy)-ben- zene was synthesized via neopentyl alcohol, phosphous oxychloride and 1,3,5-trihydroxybenzene by a two step reaction, and its structure was identified and studied by elemental analysis, IR, 1H NMR and MS techniques. The thermal decomposition kinetics of the novel flame retardant were studied by TG-DTG techniques. The kinetic parameters, including the activation energy and frequency factor of the decomposition process for the title compound were calculated through the Kissinger and Flynn-Wall-Ozawa (FWO) method and the thermal decomposition mechanism was also studied with the Coast-Redfern method. The results show that the activation energy and pre-exponential factor are 171.72 kJ•mol－1 and 37.57 s－1 with the Kissinger method and 172.05 kJ•mol－1 with the Flynn-Wall-Ozawa method respectively. The kinetic equation of the novel flame retardant can be expressed as g(α)＝α1/4, and the reaction order is n＝1/4.

Key words: 1,3,5-tris(5,5-dimethyl-1,3-dioxa-2-oxophosphorinanyl-2-oxy)benzene, synthesis, thermal decomposition kinetics, activation energy, mechanism