Polydopamine surface coating shows the capability to improve the adhesive properties as well as mechanical stabilities of energetic materials, which is highly desired for the development of insensitive munitions. However, the slow polymerization process of dopamine makes the coating process time‐consuming and uneconomic. Herein, an oxidant‐accelerated strategy was demonstrated to obtain fast polymerization kinetics of dopamine for the surface modification of HMX crystals. Upon the addition of oxidant, PDA was able to form surface layer of HMX particles within 5 min without changing the shape and polymorph of HMX crystals. The PDA coating showed the ability to improve the wettability of HMX, contributing to its abundant active groups. Moreover, the mechanical stability of PDA on HMX (HMX@PDA) samples was improved accompany with the increasing coating time, and the friction explosion probability and drop height of 300 s treated sample were 40 % and 64 cm, respectively. The detonation velocity was also measured, which showed that the effect of PDA coating on the detonation velocity of HMX was not significant. More importantly, our protocol showed the capability to fabricate HMX@PDA with different particle sizes on a large scale, satisfying the application demands of insensitive high explosives.

中文翻译：

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氧化剂加速的聚多巴胺改性工艺，可在HMX上快速制备PDA，并提高了机械稳定性

聚多巴胺表面涂层具有改善高能材料的粘合性能和机械稳定性的能力，这对于开发不敏感的弹药是非常需要的。然而，多巴胺的缓慢聚合过程使得涂覆过程耗时且不经济。在此，证明了一种氧化剂促进策略，可以对HMX晶体进行表面修饰，从而获得多巴胺的快速聚合动力学。加入氧化剂后，PDA能够在5分钟内形成HMX颗粒的表面层，而不会改变HMX晶体的形状和多晶型物。PDA涂层具有改善HMX润湿性的能力，从而为其提供了丰富的活性基团。而且，随着涂层时间的增加，PDA在HMX（HMX @ PDA）样品上的机械稳定性得到改善，300s处理过的样品的摩擦爆炸几率和跌落高度分别为40％和64 cm。还测量了爆轰速度，这表明PDA涂层对HMX的爆轰速度的影响不显着。更重要的是，我们的协议显示了能够大规模制造具有不同粒径的HMX @ PDA的能力，满足了不敏感的高炸药的应用需求。