Effects Of On Phase Transition Of Phase-stable Ammonium Nitrate

Five kinds of crystal shape of AN changes with the temperature,which results in decrease of capability,so phase-stable AN is very popular.In order to restrain or prevent AN phase transition,six kinds of polymers were added to AN samples and the effects of polymers on AN phase transition were studied by differential scanning calorimetry(DSC)method.The results show that sodium p-ethylene benzenesulfonate-acrylic acid polymer has little effect on AN phase transition,while sodium p-ethylenebenzene sulfonate-dodecyl acrylate polymer prevents the transition ofâ…£-â…¢effectively.And sodium p-ethylene benzenesulfonate polymer, dodecyl acrylate,sodium p-ethylenebenzenesulfonate-N,N -dimethyldiallyl ammonia chloride polymer and sodium p-ethylenebenzenesulfonatedodecyl acrylate-N,N -dimethyldiallyl ammonia chloride polymer prevent the transition ofâ…¢-â…¡effectively.The effect of polymer on AN phase transition results from that polymer strengthens the hydrogen2bond network and baffle the turn of NO₃^-.