热重分析
材料科学
差示扫描量热法
复合材料
四氟乙烯
氟化物
氧化物
聚偏氟乙烯
聚四氟乙烯
化学工程
纳米颗粒
含氟聚合物
反应机理
聚合物
纳米技术
催化作用
化学
共聚物
有机化学
无机化学
冶金
物理
热力学
工程类
作者
Jeffery B. DeLisio,Xiuli Hu,Tao Wu,Garth C. Egan,Gregory Young,Michael R. Zachariah
标识
DOI:10.1021/acs.jpcb.6b01100
摘要
Energetic thin films with high mass loadings of nanosized components have been recently fabricated using electrospray deposition. These films are composed of aluminum nanoparticles (nAl) homogeneously dispersed in an energetic fluoropolymer binder, poly(vinylidene fluoride) (PVDF). The nascent oxide shell of the nAl has been previously shown to undergo a preignition reaction (PIR) with fluoropolymers such as polytetrafluoroethylene (PTFE). This work examines the PIR between alumina and PVDF to further explain the reaction mechanism of the Al/PVDF system. Temperature jump (T-jump) ignition experiments in air, argon, and vacuum environments showed that the nAl is fluorinated by gas phase species due to a decrease in reactivity in a vacuum. Thermogravimetric analysis coupled with differential scanning calorimetry (TGA/DSC) was used to confirm the occurrence of a PIR, and gas phase products during the PIR and fluorination of nAl were investigated with temperature jump time-of-flight mass spectrometry (T-jump TOFMS). Results show a direct correlation between the amount of alumina in the PVDF film and the relative signal intensity of hydrogen fluoride release (HF). Although the PIR between alumina and PVDF plays an important role in the Al/PVDF reaction mechanism, burn speeds of Al/PVDF films containing additional pure alumina particles showed no burn speed enhancement.
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