Synthesis and characterization of 3-propargyl-5, 5-dimethylhydantoin

In order to improve the mechanical properties of solid propellant, a new bonding agent, 3-propargyl-5, 5-dimethylhydantoin(PDMH) was synthesized by the Gabriel method. The condition of the reaction was n(DMH):n(propargylbromine): n(methyl alcohol solvent of KOH)=1:1:1, water as solvent, reaction temperature 65°C, reaction time 3h. The yield of PDMH was 50%. Chemical structure of PDMH was identified by FT-IR, NMR, MS and TGA-DTA. Melting point of PDMH is 170-171°C and its decomposition temperature 185.5°C, it is expected to be used in composite solid propellant.