TY - JOUR
T1 - Facile fabrication of metastable aluminum/fluoropolymer composite films by spin-coating and their thermal properties
AU - Wang, Yajun
AU - Wan, Yi
AU - Li, Shihui
AU - Guo, Liang
N1 - Publisher Copyright:
© 2022, The Polymer Society, Taipei.
PY - 2022/3
Y1 - 2022/3
N2 - 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.
AB - 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.
KW - Composite film
KW - Fluoropolymer
KW - Metastable intermolecular composite
KW - Nano aluminum
KW - Spin-coating
UR - http://www.scopus.com/inward/record.url?scp=85124801587&partnerID=8YFLogxK
U2 - 10.1007/s10965-022-02934-6
DO - 10.1007/s10965-022-02934-6
M3 - Article
AN - SCOPUS:85124801587
SN - 1022-9760
VL - 29
JO - Journal of Polymer Research
JF - Journal of Polymer Research
IS - 3
M1 - 77
ER -