摘要
The thermal reaction properties of the aluminum nanoparticles/copper (II) oxide nanoparticles/poly(vinylidene fluoride) (Al-NPs/CuO-NPs/PVDF) nanocomposite (mass ratio of Al-NPs/CuO-NPs/PVDF = 20/60/20) were investigated by means of thermogravimetry–differential scanning calorimetry–mass spectrometry (TG/DSC-MS) and X-ray diffraction (XRD) analysis. Al-NPs/PVDF (mass ratio of Al-NPs/PVDF = 50/50) and CuO-NPs/PVDF (mass ratio of CuO-NPs/PVDF = 75/25) nanocomposites were also prepared as a comparison. It is observed that PVDF in the Al-NPs/PVDF nanocomposite acts as an oxidizer. The fluorine ions/fluorinated gases formed at elevated temperatures react with the Al 2 O 3 shell leading to the formation of aluminum fluoride (AlF 3 ). The oxide shell is degraded from the reaction between fluoride ions and Al 2 O 3 , leaving the core Al available for reaction with fluorine ions/fluorinated gases. H + 2 ( m/z = 2), OH + ( m/z = 17), H 2 O + ( m/z = 18), HF + ( m/z = 20), CF + ( m/z = 31) and CH 2 F + ( m/z = 33) fragments were detected in the gaseous products. For CuO-NPs/PVDF nanocomposite, oxygen was released due to the decomposition of CuO to Cu 2 O and then Cu metal, oxidizing hydrocarbon groups in PVDF. Species of OH + ( m/z = 17), H 2 O + ( m/z = 18), CO + 2 ( m/z = 44), C 2 H 2 F + ( m/z = 45) and HF + ( m/z = 20) were detected in the gaseous products. The final reduction product of CuO is Cu metal. It is observed that PVDF in the Al-NPs/CuO-NPs/PVDF nanocomposite acts as both oxidizer and reducer in the thermal decomposition. Below 550 °C, PVDF is oxidized by CuO-NPs and oxidizing Al-NPs at the same time, resulting mass reduction. After 550 °C, the remaining Al-NPs and copper (I)/copper (II) oxide will proceed the exothermic solid-state thermite reaction. OH + ( m/z = 17), H 2 O + ( m/z = 18), CO + 2 ( m/z = 44), C 2 H 2 F + ( m/z = 45) and HF + ( m/z = 20) were the main products of the decomposition of Al-NPs/CuO-NPs/PVDF nanocomposite.
危险品化学品经营许可证（带存储）