电泳沉积PVDF/Al/CuO复合含能薄膜及其燃烧性能研究
基金项目:
国家自然科学基金项目（No.52202321）；安徽省高校学科（专业）拔尖人才学术资助项目（No. gxbjZD2022060）
Electrophoretic Deposition of PVDF/Al/CuO Composite Energetic Films and Their Combustion Properties
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摘要:基于含氟聚合物的强氧化及含氟量高的特性，以聚偏二氟乙烯（PVDF）为代表，通过电泳技术，采用石胆酸（LCA）作为表面活性剂，制备了PVDF/Al/CuO有机/无机杂化含能薄膜，并对其组分、结构、形貌及含能特性进行了系统的表征。结果表明：PVDF电泳沉积过程中石胆酸的最佳添加剂量为3mL（1wt%）；当PVDF添加量为2wt%时，PVDF/Al/CuO复合薄膜的燃烧性能最好，热释放能量达3 924J/g，远远高于Al/CuO的热释放能量。产生上述实验结果的主要原因是PVDF本身具有氧化特性，能够与铝发生化学反应，释放热量；此外，PVDF热分解产生的氟能够腐蚀铝表面的钝化膜，进而释放活性铝，极大提升了Al/CuO体系的能量释放效果。
Abstract:Based on the strong oxidizing property and high fluoride content of fluorinated polymers, PVDF/Al/CuO organic/inorganic hybrid energetic thin films were prepared by electrophoresis technology (EPD), using polyvinylidene fluoride (PVDF) as representative and lithocholic acid (LCA) as surfactant. And the composition, structure, morphology, and energetic properties of PVDF/Al/CuO were systematically characterized. It is found that the optimal amount of lithocholic acid added in PVDF electrophoretic deposition is 3mL(1wt%); The combustion performance of PVDF/Al/CuO composite film is the best when the amount of PVDF is 2wt%, the heat release energy is up to 3 924 J/g, which is much higher than that of Al/CuO. The main reasons are the reaction between PVDF and aluminum with heat release. Additionally, the thermal decomposition of PVDF generates fluorine, which can corrode the passivation Al2O3 layer on the surface of aluminum, thereby releasing active aluminum, greatly improving the energy release of Al/CuO.
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