STUDIES ON THE THERMAL DECOMPOSITION CHARACTERISTICS OF TRIMETHYLOLETHANE TRINITRATE

摘要

Thermal decomposition characteristics of trimethylolethane trinitrate (TMETN) are studied under non-isothermal conditions by means of TG-DTG and pressure DSC. The intermediates in coacervate phase are characterized and identified by infrared spectrometry. The results show that at the condition of pressure, the thermal decomposition process of TMETN has two stages. The first stage is attributable to the denitration reaction caused by the rupture of the O ― NO_2 and the secondary reaction between the active gaseous products, such as NO_2, CH_2O etc. The second stage mainly is attributable to the secondary reaction between the inactive gaseous products like NO and ethylene. However, at normal pressure , its thermal decomposition process has only one stage. Under the same conditions of heating rates, the experimental pressure is principal factor affecting the peak shape , the values of peak temperature and apparent heat of decomposition. The non-isothermal kinetic data are analyzed by Kissinger's method. On the basis of the results obtained and information of thermolysis of other nitrate esters, a mechanism for the thermal decomposition of TMETN is proposed.