THERMAL BEHAVIOUR OF NITROCELLULOSE MICROCRYSTALLINE DURING AGEING AND STABILIZERS EFFICIENCY

摘要

The aim of this investigation, which contains two parts, is to study the thermal degradation energy (activation energy, E_a) for nitrocellulose microcrystalline samples prepared in laboratory during artificial ageing, by using the differential scanning calorimeter. A comparison of E_a obtained by different non isothermal kinetic models for nitrocellulose microcrystalline samples is carried out in the first part. In the second part, the thermal stability of nitrocellulose microcrystalline samples with two kinds of stabilizers (ethyl centralite and N-(2-acetoxyethyl)-p-nitroaniline) was tested via DSC using 3 % by weight of stabilizer for each preparation. All samples are subjected to artificial ageing and the thermal degradation is evaluated using non isothermal kinetic models. The results showed that N-(2-acetoxyethyl)-p-nitroaniline) is an efficient nitrocellulose stabilizer. Furthermore, the non-isothermal method is effective in the study of the thermal decomposition of nitrocellulose microcrystalline samples. In addition, the present work has demonstrated that DSC measurements permit to evaluate the actual state of the nitrocellulose microcrystalline and given away that this analytical technique is able to distinguish the differences of thermal decompositions processes in nitrocellulose microcrystalline during ageing.