To obtain the influence of FOX-7 particle morphology on its thermal properties and outgassing volume,the typical phase transformation process of FOX-7 was confirmed by in-situ Raman spectroscopy.Differential scanning calorimetry(DSC)was used to compare the crystal transformation and thermal decomposition behaviors of raw FOX-7,recrystallized FOX-7 and crushed recrystallized FOX-7 particles.Vacuum stability tests were used to compare the outgassing rates and outgassing vol-umes of three FOX-7 with typical particle size and morphology differences.The results show that the first step thermal decom-position peak temperature of FOX-7 particles with more defects is lower than that of recrystallized samples.If the particle size of FOX-7 is small,the endothermic peak of βto γ phase transition disappears on DSC curve.The phase transition process can still be observed while increasing the weight of a single test sample or increasing the heating rate to enhance the thermal effect aggregation in the phase transition process.When the heating time is the same,the total outgassing of FOX-7 with small parti-cle size is larger than that of FOX-7 with large particle size.When there are defects on the surface of large-size particles,the outgassing volume will reach the maximum faster.For the small particles with no obvious defects,its initial outgassing volume is small.However,its total outgassing volume will increase significantly and eventually exceed that of large particle size parti-cles with the extension of heating time.The size of FOX-7 particles determines the total outgassing volume,while the mor-phology of FOX-7 particles determines the outgassing rate.Aniline stabilizers have good outgassing inhibition effect on FOX-7.
维普
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