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Tuning the Reactivity of Metastable Intermixed Composite n-Al/PTFE by Polydopamine Interfacial Control
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-08-28 00:00:00 , DOI: 10.1021/acsami.8b10197
Wei He 1 , Pei-Jin Liu 1 , Feiyan Gong 2 , Bowen Tao 3 , Jian Gu 3 , Zhijian Yang 2 , Qi-Long Yan 1
Affiliation  

The metastable intermixed composite (MIC) is one of the most popular research topics in the field of energetic materials (EMs). The goal is to invent EMs with tunable reactivity and desired energy content. However, it is very difficult to tune the reactivity of MIC due to its high reactivity and sensitivity caused by enlarged specific surface area and intimate contact between the oxidizers and fuels. Herein, we demonstrated a facile fabrication method that can be used to control the reactivity between the nanoaluminum (n-Al) and poly(tetrafluoroethylene) (PTFE) using an in situ-synthesized polydopamine (PDA) binding layer. It was found that PDA can adhere to both n-Al and PTFE particles, resulting in integrated [email protected]/PTFE MICs. In comparison with traditional n-Al/PTFE MICs, the [email protected]/PTFE showed an increased energy release and reduced sensitivity and more importantly tunable reactivity. By regulating the experimental conditions of coating, the thickness of PDA could be well controlled, which makes the tunable reactivity of [email protected]/PTFE possible. The PDA interfacial layer may increase the preignition reaction (PIR) heat of Al2O3/PTFE and therefore the overall reaction heat of n-Al/PTFE. It also reveals that the PDA interfacial layer postponed the PIR, leading to an increase in onset thermal decomposition temperature (To). As To increased, a more complete reaction between PTFE and Al nanoparticles could be achieved.

中文翻译:

通过聚多巴胺界面控制调节亚稳态混合复合n-Al / PTFE的反应性

亚稳态混合复合材料(MIC)是高能材料(EMs)领域中最受欢迎的研究主题之一。目标是发明具有可调反应性和所需能量含量的EM。然而,由于MIC的高反应性和灵敏度是由于扩大的比表面积以及氧化剂和燃料之间的紧密接触而引起的,因此很难调节MIC的反应性。在这里,我们演示了一种简便的制造方法,该方法可以使用原位合成的聚多巴胺(PDA)粘合层控制纳米铝(n-Al)和聚四氟乙烯(PTFE)之间的反应性。发现PDA可以同时粘附在n-Al和PTFE颗粒上,从而形成集成的[受电子邮件保护的] / PTFE MIC。与传统的n-Al / PTFE MIC相比,[受电子邮件保护] / PTFE显示出增加的能量释放和降低的灵敏度,更重要的是可调节的反应性。通过调节涂层的实验条件,可以很好地控制PDA的厚度,这使得[电子邮件保护] / PTFE的可调反应性成为可能。PDA界面层可能会增加Al的提前点火(PIR)热2 O 3 / PTFE,因此整体反应热为n-Al / PTFE。这也表明PDA界面层推迟了PIR,导致起始热分解温度(T o)升高。随着T o的增加,可以实现PTFE与Al纳米颗粒之间更完全的反应。
更新日期:2018-08-28
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