氧化石墨烯基含能配位聚合物对四组元复合推进剂热分解及燃烧催化作用

Catalytic Effect of Graphene Oxide Based Energetic Coordination Polymers on Thermal Decomposition and Combustion Behavior of Four-component Composite Propellant

研究了3类典型氧化石墨烯基含能配位聚合物(GO-X)燃烧催化剂对四组元复合推进剂热分解特性和燃烧性能的影响;通过扫描电子显微镜(SEM)观察了推进剂截面微观形貌;采用同步热分析(DSC-TG)、傅里叶变换红外光谱仪(FTIR)对含不同GO-X的推进剂的热分解特性及其气相分解产物进行分析;采用综合燃烧诊断系统获得了该型推进剂的火焰结构与燃面推移速度,并采用X射线粉末衍射(XRD)对凝聚相燃烧产物物相结构进行了分析。结果表明,含GO-X的推进剂固化充分、组分界面结构完整,表明GO-X对固化交联反应没有明显影响;GO-CHZ-Cu对四组元推进剂的热分解催化效应十分显著,使其放热量增加到3064.1J/g,相比于空白配方增加了35.0%。GO-CHZ-Ni同样对推进剂有一定的催化效应,该样品放热量为2456.1J/g,增幅为8.2%。与纯GO相比,GO-CHZ-Ni与GO-CHZ-Cu可大幅提高四组元复合推进剂在低压段(0.5~1.5MPa)的燃速,除GO-CHZ-Cu外,其他催化剂使推进剂随着压强增大,燃速的增幅更加明显,因此压强指数提高。含GO-CHZ-Cu推进剂的压强指数为0.34,与空白配方差别不大,但整体上燃速提升46.4%,并且凝相产物分析表明GO-CHZ-Cu可使Al粉的燃烧更加完全,进一步提高了能量利用效率。

The effects of three types of typical graphene oxide-based energetic coordination polymer(GO-X)combustion catalysts on the thermal decomposition and combustion properties of the four-component composite propellants were studied.The microscopic morphology of the propellant was observed by scanning electron microscope(SEM),DSC-TG and Fourier transform infrared spectroscopy(FTIR)were used to analyze the thermal decomposition characteristics and gas phase decomposition products of the propellant;the comprehensive combustion diagnosis system was used to obtain the flame structure and the speed of the burning surface of the propellant.The phase structure of the condensed phase combustion products were analyzed by X-ray powder diffraction(XRD).The results show that the propellant containing GO-X is fully cured and the component interface structure is complete,indicating that GO-X has no significant effect on the curing and crosslinking reaction;GO-CHZ-Cu has a significant catalytic effect on the thermal decomposition of the four-component propellant,makes its decomposition heat increase to 3064.1J/g,an increase of 35.0%compared to the blank formula.GO-CHZ-Ni also has a certain catalytic effect on the propellant with an exothermic heat of 2456.1J/g,an increase of 8.2%.Compared with pure GO,GO-CHZ-Ni and GO-CHZ-Cu can greatly increase the burning rate of the four-component composite propellant in the low pressure section(0.5—1.5MPa).In addition to GO-CHZ-Cu,other catalysts make the burning rate of the propellant increase more obviously as the pressure increases,so the pressure index increases.The pressure index of the GO-CHZ-Cu propellant is 0.34,which is comparable to the blank formulation,but the overall burning rate is increased by 46.4%,and the analysis of condensed phase products shows that GO-CHZ-Cu can make the combustion of Al powder more complete and further improve the energy utilization efficiency.