TKX⁃50/KH550复合材料的制备及其与硝化棉的相容性

Preparation of TKX⁃50/KH550 Composites and their Compatibility with Nitrocellulose

为改善1,1′‑二羟基‑5,5′‑联四唑二羟胺盐(TKX‑50)与硝化棉(NC)的相容性,采用1%、2%和3%浓度的硅烷偶联剂(KH550)乙醇溶液对TKX‑50进行包覆,得到3种TKX‑50/KH550复合材料TK1、TK2和TK3。采用扫描电镜、红外光谱仪和差示扫描量热仪研究了复合材料的形貌结构及热安定性能;采用绝热加速量热仪和差示扫描量热仪研究了TKX‑50/KH550复合材料与硝化棉(NC)之间的相容性。结果表明,与原料TKX‑50(138.86 kJ·mol^(-1))相比,TKX‑50/KH550复合材料的热分解表观活化能分别增加了190.03、195.82、194.42 kJ·mol^(-1),TKX‑50的热稳定性得到了提高;在绝热环境下,较TKX‑50与NC混合体系,3种TKX‑50/KH550复合材料与NC混合体系的初始热分解温度分别提高了14.93、18.18和17.90℃;相比TKX‑50,TKX‑50/KH550复合材料与NC的相容性等级从3级提升到2级,改善了TKX‑50与NC的相容性。

To improve the compatibility of dihydroxylammonium 5,5′‑bitetrazole‑1,1′‑diolate(TKX‑50)with nitrocellulose(NC),silane coupling agent(KH550)was used as the coating agent and three TKX‑50/KH550 composites(TK1,TK2,TK3)were ob‑tained.The morphology,structure and thermal stability of the composites were studied by using scanning electron microscopy(SEM),Fourier infrared spectroscopy(FTIR),and differential scanning calorimetry(DSC).Accelerating rate calorimeter(ARC)and DSC were used to examine the compatibility of TKX‑50/KH550 composites with NC.The results show that the apparent acti‑vation energy of thermal decomposition of the prepared TKX‑50/KH550 composites are 190.03,195.82 and 194.42 kJ·mol^(-1) re‑spectively higher than that of TKX‑50(138.86 kJ·mol^(-1)),indicating the thermal stability of TKX‑50 is improved by KH550 coat‑ing.In adiabatic conditions,the initial thermal decomposition temperature of the mixtures of TKX‑50/KH550 composites and NC are 14.93,18.18 and 17.90℃respectively higher than that of TKX‑50 and NC.After coated with KH550,the compatibility of TKX‑50 and NC is improved,and the compatibility level of TKX‑50/KH550 composites and NC is raised from Level 3 to Level 2.