聚四氟乙烯基铝活性材料的热化学反应特性

为获得聚四氟乙烯（PTFE）基铝（Al）活性材料的热化学反应性能，开展包含不同Al粒径的PTFE基Al活性材料在不同升温速率下的热化学反应实验。采用湿混工艺制备包含50 nm和10 μm两种Al粒径的PTFE基Al活性材料，并利用差示扫描量热法与热重分析法分析它们在10 ℃/min、 15 ℃/min、20 ℃/min、30 ℃/min升温速率下的热化学反应行为。结果表明：在10~ 30 ℃/min升 温速率中，包含纳米Al颗粒的PTFE基Al试样都发生了反应放热，而包含微米Al颗粒的PTFE基Al试样在小于900 ℃时并未与PTFE分解产物发生反应； Al颗粒的加入会对PTFE的热分解起到一定催化作用；对于Al粒径为50 nm的PTFE基Al活性材料，随着升温速率的增大，反应放热峰的峰值温度不断向高温区移动（由10 ℃/min的578.9 ℃移动到30 ℃/min时的608.5 ℃），单 位放热量逐渐增多（由10 ℃/min升温速率下的331.6 J/g升高到30 ℃/min升温速率下的641.3 J/g）；研究结果对PTFE基Al活性材料的工程化应用具有参考意义。

Thermochemical Reaction Characteristics of PTFE/Al Reactive Material

In order to obtain the thermochemical reaction properties of PTFE/Al reactive materials, the thermochemical reaction experiments of PTFE/Al reactive materials with different aluminum particle sizes were carried out at different heating rates. The PTFE/Al active materials with 50 nm and 10 μm aluminum particle sizes were prepared by wet mixing process, and their thermochemical reaction behaviors at heating rates of 10 ℃/min, 15 ℃/min, 20 ℃/min and 30 ℃/min were analyzed by differential scanning calorimetry (DSC) and thermogravimetry (TG). The results show that, at the heating rate from 10 ℃/min to 30 ℃/min, all the PTFE/Al samples containing nano Al particles are exothermic, while the PTFE/Al samples containing micro Al particles do not react with the decomposition products of PTFE at a temperature lower than 900 ℃; in addition, the addition of Al particles plays a catalytic role in the thermal decomposition of PTFE. For PTFE/Al active materials with aluminum particle size of 50 nm, the peak temperature of reaction exothermic peak moves to high temperature zone with the increase in heating rate, from 578.2 ℃ to 608.5 ℃. The unit heat release increases from 331.6 J/g to 641.3 J/g. The research results have important reference value for the engineering application of PTFE/Al reactive materials.