Synthesis, characterization, thermal and explosive properties of potassium salts of trinitrophloroglucinol

Three different substituted potassium salts of trinitrophloroglucinol (H(3)TNPG) were prepared and characterized. The salts are all hydrates, and thermogravimetric analysis (TG) and elemental analysis confirmed that these salts contain crystal H2O and that the amount crystal H2O in potassium salts of H(3)TNPG is 1.0 hydrate for mono-substituted potassium salts of H(3)TNPG [K(H(2)TNPG)] and di-substituted potassium salt of H(3)TNPG [K-2(HTNPG)], and 2.0 hydrate for tri-substituted potassium salt of H(3)TNPG [K-3(TNPG)]. Their thermal decomposition mechanisms and kinetic parameters from 50 to 500 degrees C were studied under a linear heating rate by differential scanning calorimetry (DSC). Their thermal decomposition mechanisms undergo dehydration stage and intensive exothermic decomposition stage. FT-IR and TG studies verify that their final residua of decomposition are potassium cyanide or potassium carbonate. According to the onset temperature of the first exothermic decomposition process of dehydrated salts, the order of the thermal stability from low to high is from K(H(2)TNPG) and K-2(HTNPG) to K-3(TNPG), which is conform to the results of apparent activation energy calculated by Kissinger's and Ozawa-Doyle's method. Sensitivity test results showed that potassium salts of H(3)TNPG demonstrated higher sensitivity properties and had greater explosive probabilities. (C) 2007 Elsevier B.V. All rights reserved.