ABSTRACT Graphene nanoplates (GNPs) were incorporated into a solid composite propellant (NC-TEGDN-RDX) to tune the thermal, mechanical, and combustion properties of the material. Physical, thermal, and combustion properties of NC-TEGDN-RDX with <2 wt% addition of GNPs were characterized using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), tensile/compressive/impact strength testing, and constant volume combustion experiments. Microstructure of the composite propellants examined using SEM demonstrated uniform dispersion of the GNPs at low-weight percent additives (<1 wt%), but began to show large agglomerations of the additives at higher additive content. Decomposition enthalpy of the propellant with 1 wt% GNPs increased by ~130 J/g compared to neat propellants. Moreover, the maximum burning rate was observed for samples containing 1 wt% GNPs, with values of 19 cm/s at 20°C and 17 cm/s at −40°C. Dynamic vivacity of the propellant achieved a maximum upon addition of 1 wt% GNPs. The pressure exponent of the propellant decreased with the addition of GNPs, as well. The mechanical properties including tensile, compressive, and impact strength were improved at 20°C and −40°C. These results demonstrate that the addition of GNPs may offer new methods by which to tune and improve thermal decomposition, thermal conductivity, combustion performance, and mechanical properties of the NC-TEGDN-RDX propellants.

中文翻译：

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通过掺入石墨烯纳米片调节 NC-TEGDN-RDX 推进剂的热、机械和燃烧特性

摘要石墨烯纳米片（GNPs）被结合到固体复合推进剂（NC-TEGDN-RDX）中以调节材料的热、机械和燃烧特性。使用扫描电子显微镜 (SEM)、差示扫描量热法 (DSC)、拉伸/压缩/冲击强度测试和定容燃烧表征添加 <2 wt% GNP 的 NC-TEGDN-RDX 的物理、热和燃烧特性实验。使用 SEM 检查的复合推进剂的微观结构表明 GNP 在低重量百分比添加剂 (<1 wt%) 下均匀分散，但在较高添加剂含量下开始显示添加剂的大团聚。与纯推进剂相比，具有 1 wt% GNP 的推进剂的分解焓增加了约 130 J/g。而且，对于含有 1 wt% GNP 的样品，观察到最大燃烧速率，在 20°C 下为 19 cm/s，在 -40°C 下为 17 cm/s。添加 1 wt% GNP 后，推进剂的动态活力达到最大值。推进剂的压力指数也随着 GNP 的加入而降低。在 20°C 和 -40°C 下，包括拉伸、压缩和冲击强度在内的机械性能得到改善。这些结果表明，添加 GNP 可以提供新的方法来调整和改善 NC-TEGDN-RDX 推进剂的热分解、热导率、燃烧性能和机械性能。推进剂的压力指数也随着 GNP 的加入而降低。在 20°C 和 -40°C 下，包括拉伸、压缩和冲击强度在内的机械性能得到改善。这些结果表明，添加 GNP 可以提供新的方法来调整和改善 NC-TEGDN-RDX 推进剂的热分解、热导率、燃烧性能和机械性能。推进剂的压力指数也随着 GNP 的加入而降低。在 20°C 和 -40°C 下，包括拉伸、压缩和冲击强度在内的机械性能得到改善。这些结果表明，添加 GNP 可以提供新的方法来调整和改善 NC-TEGDN-RDX 推进剂的热分解、热导率、燃烧性能和机械性能。