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首页> 外文期刊>RSC Advances >Tailored graphene based polyurethane composites for efficient electrostatic dissipation and electromagnetic interference shielding applications
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Tailored graphene based polyurethane composites for efficient electrostatic dissipation and electromagnetic interference shielding applications

机译：量身定制的石墨烯基聚氨酯复合材料，可有效消除静电并屏蔽电磁干扰

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摘要

Nanocomposite materials, based on commercial thermoplastic polyurethane filled with graphene, are new alternative candidates for electrostatic charge dissipation and electromagnetic interference shielding applications due to their light weight, ease of processing and tunable electrical conductivities. The solution blending approach was used to fabricate a series of polyurethane/graphene (PUG) nanocomposites with graphene loading ranging from 0-5.5 vol%. For the preparation of polymer nanocomposites, graphene was prepared by the successful oxidation of pristine graphite, followed by thermal exfoliation and reduction. The effect of graphene on the electrical properties of PUG nanocomposites was investigated to evaluate the potential of these nanocomposites as an effective and light weight electrostatic charge dissipative (ESD) and electromagnetic interference (EMI) shielding material in the frequency range of 8.2-12.4 GHz (X band). The suitability of the nanocomposites for ESD was examined by displaying the decay of the voltage as a function of time. The experimental results indicate that a static decay time of 0.49 s at 1.6 vol% graphene and an EMI shielding effectiveness of similar to 21 dB in the X-band for 3 mm thickness was achieved at 5.5 vol% graphene loading. In addition, the electromagnetic attributes, such as the real and imaginary permittivity of the composites as a function of frequency, were also investigated. Therefore, such polyurethane nanocomposites shall not only be useful for antistatic coatings but also have great potential as an effective and light weight shielding material for protection from electromagnetic radiation, in electromagnetic shielding bags for packaging of electronic circuits and in a variety of applications.
机译：基于填充有石墨烯的商用热塑性聚氨酯的纳米复合材料由于其重量轻，易于加工和可调节的电导率而成为静电电荷消散和电磁干扰屏蔽应用的新的替代选择。溶液共混法用于制备一系列聚氨酯/石墨烯（PUG）纳米复合材料，石墨烯负载量为0-5.5％（体积）。为了制备聚合物纳米复合材料，首先将原始石墨成功氧化，然后进行热剥落和还原，以制备石墨烯。研究了石墨烯对PUG纳米复合材料电学性能的影响，以评估这些纳米复合材料作为有效且轻量级的静电荷耗散（ESD）和电磁干扰（EMI）屏蔽材料的潜力，其频率范围为8.2-12.4 GHz（ X波段）。通过显示电压随时间的变化来检查纳米复合材料对ESD的适用性。实验结果表明，当石墨烯负载量为5.5％时，在3％厚度的X波段上，静态衰减时间为0.49 s，在X波段的EMI屏蔽效果类似于21 dB。此外，还研究了电磁属性，例如复合材料的实，虚电容率与频率的关系。因此，这样的聚氨酯纳米复合材料不仅将用于抗静电涂料，而且在用于电子电路包装的电磁屏蔽袋中以及在各种应用中，作为用于保护免受电磁辐射的有效且轻量的屏蔽材料具有巨大的潜力。

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