采用还原法在三元乙丙橡胶(EPDM)泡沫结构中原位生长还原氧化石墨烯(RGO)气凝胶材料,制备了RGO/EPDM泡沫双三维复合结构。研究了氧化石墨烯先驱体(GOs)溶液浓度对泡沫复合材料微观结构及电磁性能的影响规律。结果表明:不同先驱体浓度下,RGO均以三维泡沫结构形态附着在EPDM泡沫骨架结构内部,分散均匀且具有较好的附着力;成分分析显示材料复合后界面未发生化学反应,各部分材料仍保持其本征特性;微波反射率测试结果显示,在8～18GHz范围内,不同浓度的样品单体均未表现出明显的强电磁吸收能力,但3块样品梯度叠加后(厚度达7mm)吸波性能出现大幅提升,最大吸波强度达到-22.27dB,-10dB吸收频段为9.9～18GHz,频宽达到8.05GHz,显示出良好的宽频吸波性能。
Reduced graphene oxide(RGO) aerogels were grown into the porous structure of the ethylene propylene diene monomer(EPDM),RGO/EPDM foam double three-dimensional composite structure was synthesized by the in situ growth method.And the effect of solution concentration of graphene oxide precursor on the microstructure and electromagnetic properties of foam composites was studied.Consequently,the results showed that RGO was attached to the internal skeleton structure of the EPDM with a three-dimensional foam structure under different precursor concentrations,which was dispersed evenly and had good adhesion.Composition analysis results indicated that there was no chemical reaction on the interface after composite material,and all the materials remained their intrinsic characteristics.The microwave reflectance test results indicated that the sample monomers with different concentration presented no obvious strong electromagnetic absorption capability at 8～18GHz,but the microwave absorption performance was greatly enhanced after the gradient superposition of three samples(the thickness was 7mm),the minimum reflection loss reached -22.27dB and the qualified bandwidth of the sample was 8.05GHz at 9.9～18GHz,showing a good broadband wave absorption performance.
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基金资助
国家自然科学基金青年基金(51502341)
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