Nie Hongqi, Wang Zikangping, Zhang Xue-Xue, Yang Su-Lan, Ren Zhi, Yan Qi-Long
Science and Technology on Combustion, Internal Flow and Thermo-Structure Laboratory, Northwestern Polytechnical University, Xi'an 710072, China.
Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
Langmuir. 2023 Sep 12;39(36):12599-12609. doi: 10.1021/acs.langmuir.3c01240. Epub 2023 Aug 29.
In this study, a 2D structured triaminoguanidine-glyoxal polymer with a high nitrogen content has been coordinated with metal ions to produce energetic metal complexes (TAGP-Ms) employed as energetic burn rate inhibitors. The metal ions (Ba, K, and Ca) are elaborately selected based on their ability of suppressing the burn rate of composite propellants. The CL-20 crystals were intercalated with prepared TAGP-Ms materials via a solvent-antisolvent method for realization of the precise control on burning behaviors of studied propellants. The influence of TAGP-Ms inhibitors on thermal decomposition and combustion characteristics of high-energy composite propellants was evaluated using thermal analysis and a combustion diagnostic method. Results of TGA/DSC-FTIR measurements suggest that the thermal decomposition of CL-20-containing composite propellants was found to be constrained by varied degrees as a result of TAGP-Ms additions, in which the TAGP-K displays a stronger effect on suppressing the thermal decomposition of CL-20 compared with that of other TAGP-Ms. The FTIR spectra indicate that the primary gaseous phase products are composed of NO, HO, and CO in CL-20 decomposition, as well as by HCl, HO, NO, and NO in the decomposition of AP for all studied composite propellants. The combustion characterizations show that the TAGP-K-containing composite propellant exhibits a significantly reduced rate of heat release but is associated with a higher flame radiation intensity increased by 4.2% compared with that of the reference propellant, which clearly implies that the TAGP-K is capable of suppressing the energy release rate while ensuring the high energetic features of propellants to be well maintained. Moreover, the burn rate pressure exponents are considerably decreased by ∼10% for the TAGP-K-containing propellants in comparison with those of propellants with the typical formulation, which strongly suggests that TGAP-Ms are promising candidates for tuning the combustion behaviors of composite propellants by influencing the decomposition processes of CL-20 and AP collectively.
在本研究中，一种具有高氮含量的二维结构化三氨基胍 - 乙二醛聚合物已与金属离子配位，以制备用作高能燃速抑制剂的含能金属配合物（TAGP - Ms）。基于金属离子（Ba、K和Ca）抑制复合推进剂燃速的能力精心选择了这些金属离子。通过溶剂 - 反溶剂法将制备的TAGP - Ms材料插入CL - 20晶体中，以实现对所研究推进剂燃烧行为的精确控制。使用热分析和燃烧诊断方法评估了TAGP - Ms抑制剂对高能复合推进剂热分解和燃烧特性的影响。热重 - 差示扫描量热 - 傅里叶变换红外光谱（TGA/DSC - FTIR）测量结果表明，由于添加了TAGP - Ms，含CL - 20的复合推进剂的热分解受到不同程度的抑制，其中TAGP - K与其他TAGP - Ms相比，对抑制CL - 20的热分解具有更强的效果。傅里叶变换红外光谱表明，所有研究的复合推进剂中，CL - 20分解的主要气相产物由NO、HO和CO组成，以及AP分解中的HCl、HO、NO和NO。燃烧特性表明，含TAGP - K的复合推进剂的热释放速率显著降低，但与参比推进剂相比，火焰辐射强度提高了4.2%，这清楚地表明TAGP - K能够抑制能量释放速率同时确保推进剂的高能特性得到良好维持。此外，与典型配方的推进剂相比，含TAGP - K的推进剂的燃速压力指数大幅降低约10%，这有力地表明TGAP - Ms有望通过共同影响CL - 20和AP的分解过程来调节复合推进剂的燃烧行为。
