To reduce the impact and electrostatic discharge sensitivities of RDX (hexahydro-1,3,5-trinitro-1,3,5-triazine), the polydopamine (PDA) and amorphous TiO₂ were used as shell materials to construct a series of RDX@PDA@TiO₂ double layer core–shell energetic composites with an RDX as the inner core and amorphous TiO₂ as the exterior shell; and the PDA was employed as bio-adhesive agent coated on the surface of RDX to enhance the interfacial adhesion between RDX and amorphous TiO₂. Then, by the characteristics of scanning electron microscopy (SEM), flourier-transform infrared (FT-IR) spectra, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), the double layer core–shell structure of RDX@PDA@TiO₂ composites was indicated; and the reaction mechanism of the depositions of amorphous TiO₂ shell was proposed. Furthermore, we explored the influence of different content, morphologies of amorphous TiO₂ shell and thickness of PDA on the desensitization effect of RDX@PDA@TiO₂ composites. Compared with pure RDX, the RDX@PDA@TiO₂-1#, -2#, -3#, -4#, -5# samples exhibited significant enhancement of 4.0 J (26.7%), 15.3 J (102.0%), 28.2 J (188.0%), 30.0 J (200.0%), 21.8 J (145.3%) of impact energy, and 0.7 (50.0%), 1.0 J (71.4%), 2.2 J (157.1%), 7.2 J (514.3%), 5.9 J (421.4%) of electrostatic discharge energy, respectively. And the prepared RDX@PDA@TiO₂ composites with thicker and lager particle size of amorphous TiO₂ shell leaded to better desensitization effect. This work potentially provided an alternative method for improving vulnerability and transportation safety of RDX.

为了降低RDX（六氢-1,3,5-三硝基-1,3,5-三嗪）的冲击和静电放电敏感性，以聚多巴胺（PDA）和无定形TiO ₂为壳材料构建了一系列RDX @PDA@TiO ₂双层核壳含能复合材料，以RDX为内核，无定形TiO ₂为外壳；PDA作为生物粘合剂涂覆在RDX表面以增强RDX与无定形TiO ₂之间的界面粘附。然后，通过扫描电子显微镜 (SEM)、荧光变换红外 (FT-IR) 光谱、X 射线衍射 (XRD) 和 X 射线光电子能谱 (XPS) 的特征，RDX 的双层核壳结构@PDA@TiO ₂复合材料被指出；并提出了无定形TiO ₂壳层沉积的反应机理。此外，我们探讨了不同含量、无定形TiO ₂壳形貌和PDA 厚度对RDX@PDA@TiO ₂复合材料脱敏效果的影响。与纯RDX相比，RDX@PDA@TiO ₂ -1#、- ₂ #、-3#、-4#、-5#样品表现出显着提高4.0 J（26.7%）、15.3 J（102.0%）、 28.2 J (188.0%), 30.0 J (200.0%), 21.8 J (145.3%) 冲击能量，0.7 (50.0%), 1.0 J (71.4%), 2.2 J (157.1%), 7.2 J (514%) )，分别为 5.9 J (421.4%) 的静电放电能量。以及制备的RDX@PDA@TiO ₂具有更厚和更大粒径的无定形TiO ₂壳的复合材料导致更好的脱敏效果。这项工作可能为提高 RDX 的脆弱性和运输安全性提供了一种替代方法。