The effect of PIBSA mass fraction on the thermal decomposition and rheological properties of on-site mixed emulsion matrix
In order to explore the effect of PIBSA(polyisobutylene succinic anhydride)on the thermal decomposition characteristics and rheological properties of in-situ mixed emulsion matrix,the microscopic characteristics,thermal decomposition characteristics and rheological properties of in-situ mixed emulsion explosive matrix samples containing different mass fractions of PIBSA(0％,0.5％,1％,1.5％)composite emulsifiers were studied by laser particle size analyzer,optical microscope,synchronous thermal analysis technology and rotary rheometer.The results showed that the homogeneity of the internal phase particles of the on-site mixed emulsion matrix samples with PIBSA was better,and the average particle size and dispersion index were lower than those without PIBSA.When the mass fraction of PIBSA in the system is 0.5％,the average particle size of the inner phase is small,the distribution uniformity is the best and the detonation velocity is the fastest.The addition of PIBSA had no significant effect on the thermal decomposition process of the emulsion matrix,but with the increase of PIBSA mass fraction,the apparent activation energy shows a trend of first increasing and then decreasing.When the mass fraction of PIBSA in the system is 0.5％,the apparent activation energy E.of the emulsion matrix increases by about 14.8％compared to the single emulsifier(Span-80)sample.With the increase of PIBSA content,the shear stress of the emulsified matrix increased first and then decreased.The Ostwald-deWael model has the best description of the rheological properties of the emulsion matrix,which provides a scientific basis for the mechanical properties and mathematical model development of the on-site mixed emulsion matrix.
site mixied emulsion explosiveemulsion matrixinternal phase characteristicsrheological propertiesrheological model
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