Abstract

Thermal degradation in air of Nafion proton-conducting polymer in composites containing nanostructured carbon materials [carbon black of Vulcan XC-72 grade and a graphene-like material (thermally expanded graphite)] and platinum nanoparticles was studied by nonisothermal kinetic analysis. The effect of the contact of Nafion with one or another material of the composite on the degradation kinetics was examined. The activation energy of Nafion desulfonation was calculated in relation to the component composition. The temperature dependence of the polymer lifetime for materials of different component compositions was evaluated. The materials were characterized by scanning and transmission electron microscopy and by differential thermal analysis. The presence of carbon materials enhances the heat resistance of Nafion and narrows the temperature interval of its degradation. The presence of various forms of carbon material (carbon black, thermally expanded graphite) and of platinum nanoparticles influences the Nafion desulfonation and its kinetic characteristics differently. The mechanism of thermal stabilization of Nafion in the presence of carbon materials was suggested.

中文翻译：

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Nafion在纳米结构材料存在下的热降解：热膨胀石墨，炭黑和铂

摘要

通过非等温动力学分析，研究了Nafion质子传导聚合物在包含纳米结构碳材料[Vulcan XC-72级炭黑和石墨烯样材料（热膨胀石墨）]和铂纳米颗粒的复合物中在空气中的热降解。研究了Nafion与复合材料的一种或另一种材料接触对降解动力学的影响。相对于组分组成，计算了Nafion脱硫的活化能。评价了不同组分组成的材料的聚合物寿命的温度依赖性。通过扫描和透射电子显微镜以及差热分析来表征材料。碳材料的存在增强了Nafion的耐热性，并缩小了其降解的温度间隔。各种形式的碳材料（炭黑，热膨胀石墨）和铂纳米颗粒的存在对Nafion脱硫及其动力学特性产生不同的影响。提出了在碳材料存在下Nafion的热稳定机理。