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Facile fabrication of metastable aluminum/fluoropolymer composite films by spin-coating and their thermal properties

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Abstract

Fluoropolymers such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) have served as potent oxidizers for aluminum (Al)-based pyrolant designs with adequate gas output and heat release. In this study, nano-Al was modified by silane coupling agent KH-570 to improve the agglomeration phenomenon, and then Al/PTFE/PVDF composite films were fabricated by a simple spin-coating method. The crystal structure, micro morphology, thermal property, and kinetic process were characterized and analyzed in detail. The results showed that Al particle size had a significant influence on the thermal property of the composite film. Micro-Al (1 μm) had an exothermic reaction with PTFE, but hardly reacted with PVDF in Al/PTFE/PVDF composite films. However, thermal decomposition reaction of PVDF occurred under the catalysis of surface Al2O3 when nano-Al was used. Composite films with nano-Al (50 nm and 100 nm) exhibited similar thermal behaviors. In addition, with the increase of Al content, the reaction temperature of Al2O3-PVDF and Al-PTFE increased slightly, and so did the total reaction heat release. Thermal kinetics calculation revealed that the apparent activation energy of Al-PTFE reaction was the highest of 139.96 kJ⋅mol−1, while the reaction of Al2O3-PVDF occurred relatively easily. The spin-coating method used in this study was proved to have a potential application in the preparation of energetic composite films.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Funding

This work was supported by the project of State Key Laboratory of Explosion Science and Technology (Bei**g Institute of Technology, China) [grant number YBKT19-04].

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Authors and Affiliations

  1. State Key Laboratory of Explosion Science and Technology, Bei**g Institute of Technology, Bei**g, 100081, China

    Yajun Wang, Yi Wan, Shihui Li & Liang Guo

  2. School of Mechatronical Engineering, Bei**g Institute of Technology, No.5 Zhongguancun South Street, Haidian District, Bei**g, 100081, China

    Yajun Wang

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  1. Yajun Wang
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  2. Yi Wan
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  4. Liang Guo
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Contributions

Yajun Wang: Conceptualization, Methodology, Supervision, Writing- Reviewing and Editing. Yi Wan: Investigation, Data curation, Writing- Original draft preparation. Shihui Li: Visualization, Writing- Original draft preparation. Liang Guo: Investigation.

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Correspondence to Yajun Wang.

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Wang, Y., Wan, Y., Li, S. et al. Facile fabrication of metastable aluminum/fluoropolymer composite films by spin-coating and their thermal properties. J Polym Res 29, 77 (2022). https://doi.org/10.1007/s10965-022-02934-6

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