Highly Reactive PTFE/Mg Nanolaminates and Its Combustion Performances

摘要

Development of reactive materials with high energetic performances is highly significant owing to the increasing demands for both military and civilian applications. In this work, nanolaminated structure is introduced to construct reactive materials with high reactive properties through periodically stacking fluorine oxidant and metal fuel at sub-nanometer scale. The exothermic reaction performances and combustion characteristics can be significantly enhanced resulted from the ultra-high interfacial area and reduced mass diffusion distance at sub-nanometer scale between fluorine oxidant and metal fuel. The energy output of 2632.1 J g(-1) and lower onset reaction temperature of 438 degrees C are observed for the nanolaminated poly(tetrafluoroethylene) (PTFE)/magnesium (Mg). Furthermore, a self-propagation combustion reaction at the micrometer scale with tunable burn rate can be achieved through controlled thickness of layers. A burn rate model is proposed to illustrate the influence of structural feature on the burn rate of the nanolaminated PTFE/Mg. Based on the above results, a microenergetic device is prepared to demonstrate the practical application of the nanolaminated PTFE/Mg.