ABSTRACT

One challenge in the application of traditional metastable intermolecular composite (MIC) material is that MIC particles are not compatible with micro-electro-mechanical system (MEMS) based pyrotechnic device. The preparation of MIC film material can solve such problem. In this paper, we applied electrophoretic deposition method to prepare aluminum/polyvinylidene fluoride (Al/PVDF) and aluminum/polytetrafluoroethylene (Al/PTFE) MIC films. The morphological, structural and compositional information of the film samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and energy dispersive spectrometer (EDS). The energy-release characteristics of Al/PVDF and Al/PTFE MIC films were analyzed by thermogravimetric (TG) analysis and differential scanning calorimetry (DSC). Micromorphology results show that the components of the films were evenly distributed but there were a few holes. DSC curves of both Al/PVDF and Al/PTFE films show that there was only one major exothermic peak and the exothermic temperature of Al/PTFE was 63°C higher than that of Al/PVDF. Kinetic analysis of main exothermic peaks indicates that the apparent activation energies (E_a) calculated by Ozawa, Flynn-Wall-Ozawa and Starink methods were reliable. And E_a of Al/PTFE is higher than that of Al/PVDF, implying that Al/PVDF is prone to react. The kinetics results of electrophoretic deposition for both Al/PVDF and Al/PTFE show that the parabolic relationship between deposition mass and deposition time exist in all experiments.

摘要

传统亚稳态分子间复合材料 (MIC) 应用面临的一项挑战是 MIC 颗粒与基于微机电系统 (MEMS) 的烟火装置不兼容。MIC薄膜材料的制备可以解决这样的问题。在本文中，我们应用电泳沉积方法制备铝/聚偏二氟乙烯 (Al/PVDF) 和铝/聚四氟乙烯 (Al/PTFE) MIC 薄膜。通过扫描电子显微镜 (SEM)、X 射线衍射 (XRD)、X 射线光电子能谱 (XPS) 和能谱仪 (EDS) 对薄膜样品的形态、结构和组成信息进行表征。通过热重 (TG) 分析和差示扫描量热法 (DSC) 分析了 Al/PVDF 和 Al/PTFE MIC 薄膜的能量释放特性。显微形态学结果表明，薄膜的成分分布均匀，但存在少量孔洞。Al/PVDF 和 Al/PTFE 薄膜的 DSC 曲线表明，只有一个主要的放热峰，Al/PTFE 的放热温度比 Al/PVDF 高 63°C。主要放热峰的动力学分析表明表观活化能 (E _a ) 由 Ozawa、Flynn-Wall-Ozawa 和 Starink 方法计算出的结果是可靠的。并且Al/PTFE 的E _a高于Al/PVDF，这意味着Al/PVDF 容易发生反应。Al/PVDF 和 Al/PTFE 的电泳沉积动力学结果表明，所有实验中都存在沉积质量和沉积时间之间的抛物线关系。