With using the dimethyl methylphosphonate(DMMP) and ethylene glycol(EG) as raw materials with an optimal ratio of 1 ∶1, and 4kinds of catalysts, including ionic liquid([Bmim]BF4), p-toluenesulfonic acid(p-TSA), cerium phosphotungstate and the self-made catalyst, the poly(oxy-1,2-ethanediyl)methylphosnate(which is a fire retardant)is prepared at 160℃. The synthesized product is a colorless, transparent and sticky liquid. The methyl iodide and end-capping reagent G is respectively used for the end capping of ...