Abstract

In this work, a nanocomposite was developed by in-situ polymerization using industrial-grade diatom-containing silicone rubber (SR) as the matrix and reduced graphene oxide (RGO) as filler. The Concentration of RGO, was very low, varying from 0 to 1 wt%. In these nanocomposites, diatoms as well as RGO flakes of sizes smaller than 20 µm were dispersed homogeneously within the SR. According to thermogravimetric analysis (TGA), the thermal stability of the composite is improved by increasing the decomposition temperature of SR from 497 °C to 546 °C at 0.8 wt% of RGO. A TGA signal between 620 °C and 670 °C is identified as due to C-C bonds thermal breaking, whose integrated intensity increases in proportion to the concentration of RGO and can be used to determine the concentration of RGO in similar composite systems. When 1.0 wt% of RGO is added thermal conductivity increases by 47.5% and the electrical resistivity decreases four orders of magnitude, respect to SR values. The SR/RGO nanocomposite is flexible and represents a good candidate for applications in the development of sensors and biomedical applications. The use of industrial-grade SR reduces production costs of composites in comparison to those prepared with more expensive analytical grade rubbers.

摘要

在这项工作中，以工业级硅藻硅橡胶（SR）为基体，还原氧化石墨烯（RGO）为填料，通过原位聚合开发了一种纳米复合材料。RGO 的浓度非常低，从 0 到 1 wt% 不等。在这些纳米复合材料中，硅藻以及尺寸小于 20 µm 的 RGO 薄片均匀地分散在 SR 中。根据热重分析 (TGA)，在 0.8 wt% 的 RGO 下，通过将 SR 的分解温度从 497 °C 提高到 546 °C，复合材料的热稳定性得到改善。620°C 和 670°C 之间的 TGA 信号被确定为由于 CC 键热断裂，其积分强度与 RGO 浓度成比例增加，可用于确定类似复合系统中 RGO 的浓度。当 1。相对于 SR 值，添加 0 wt% 的 RGO 热导率增加 47.5%，电阻率降低四个数量级。SR/RGO 纳米复合材料是灵活的，是传感器和生物医学应用开发的良好候选材料。与使用更昂贵的分析级橡胶制备的复合材料相比，使用工业级 SR 降低了复合材料的生产成本。