Study Combustion Gas Components And Thermal Stability Of Propellants Containing Nano Multi-functional Materials

Fluorine-containing nano multi-functional materials synthesized by the polymerization of fluorine-containing monomers have not only the high strength,hardness,mechanical properties of the nanomaterials but also the high thermal stability and low surface free energy of fluoro-polymer materials,which could be used to control the combustion of propellants.When controlling the combustion performance of propellants,it is necessary to study the combustion process,the components of combustion gas products and the thermal stability performance of propellant.Herein,it is needed to study the changes of the combustion gas components and thermal stability performance of propellant before and after the addition of fluorinate-containing nano multi-functional materials at high pressure.In this present dissertation,the changes of the combustion gas components and thermal stability performance of propellant before and after the addition of fluorinate-containing nano multi-functional materials at high pressure had been studied in detail.Firstly,a closed bomb and Fourier transform infrared spectroscopy were used to analyze the combustion performance and combustion gas components of the different formulations propellant,which the pressure,different ingredients of propellant,different contents of fluorinate-containing nano multi-functional materials and temperature in the gas cell were researched.Secondly,the effect of the gas components of propellant on the thermal decomposition process were studied by means of Thermogravimetric analysis/Ddifferential scanning calorimeter-Infrared-Mass spectrometry at atmospheric pressure and the influence of pressure and additives on the combustion mechanism of the propellant was revealed when compared with the gas components under high pressure.The influence of pressure and additives on the combustion mechanism of the propellant was revealed.At the last,an acceleration calorimeter was used to study the thermal stability of the modified propellant at adiabatic condition,preliminary studying the thermal stability performance of the modified propellant,which provided the important information for the research of new formulation propellant.The results show that TG-1 as the base propellant can reduce the concentration of gas components of the new formula propellant after high pressure combustion compared with single-base propellant as the base propellant.The addition of 3F and 12F nano multi-functional materials can reduce the concentration of gas components of TG-1 propellant after high pressure combustion.However,compared with 12F nano multi-functional materials,the effect of 3F nano multi-functional materials is better.And with the increase of the content of the 3F nano multi-functional materials,the concentration of the gas components of TG-1 propellant after high pressure combustion decreases especially was the concentration of CO,thus,being helpful for the environmental pollution.There is a large amount of NO₂ and NO in the thermal decomposition of gas components of the TG-1 propellant at atmospheric pressure,but only a trace amount of NO gas was detected after high pressure combustion.Indicating that the pressure on the TG-1 propellant thermal decomposition of gas components have a certain impact.The thermal decomposition characteristic parameters of TG-1 propellant,which before and after the addition of 3F nano multi-functional materials at the adiabatic environment by calculated.It was found that the initial decomposition temperature and the decomposition rate of the propellant were increased,which indicated that the 3F nano multi-functional materials could improve the thermal stability of the propellant,at the same time,lower the thermal hazard of the propellant.