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  • Functional energetic materi...
    Yang, Pei; Liu, Huihui; Wang, Shuang; Meng, Linghui; Bai, Yongping; He, Jinmei

    Colloids and surfaces. A, Physicochemical and engineering aspects, 08/2024, Letnik: 694
    Journal Article

    Paraffin wax (PW) coatings are widely used in the military as the most effective way to reduce the sensitivity of energetic materials, but their inert nature is not conducive to energy release. In this work, paraffin-like fluorine-containing molecules (FPW) which are highly anticipated on a large scale were synthesized by combining crystalline units with fluorine units via a simple method. Core-shell Al@FPW was prepared for further characterization. FPW exhibits better lubrication and greater density (1.14 g/cm3 vs. 0.81 g/cm3) than PW, which can provide favorable guarantees for reduced friction sensitivity and increased energy density. The similar melting temperatures and crystallization enthalpies (168 J/g vs. 201 J/g) of FPW and PW are advantageous for mitigating the temperature sensitivity of nano-Al. Furthermore, the improved hydrophobicity of Al@FPW prevents further oxidation of the active metal, thereby enhancing the preservation of nano-Al. Moreover, the reaction process of Al@FPW was characterized by DSC-Tg. Notably, the combustion pressure, pressurization rate and calorific value of Al@FPW are significantly increased compared to Al@PW. Meanwhile, the ignition delay time is reduced by 83 % and the combustion rate is increased by 330 %, which is attributed to the action of fluorine during the reaction. The exceptional performance of FPW holds great potential for replacing PW in various applications. Display omitted •Fluorine-containing materials (FPW) can be simply synthesis.•The unique properties of FPW in lubrication, hydrophobicity and thermal management enhance the safety performance of energetic materials.•The FPW coating effectively improves the reactive properties of the active nano-Al.•FPW can significantly shorten the ignition delay time and greatly increase the combustion rate of nano-Al.