三维结构石墨烯气凝胶/环氧树脂复合材料的制备和电磁屏蔽性能
Preparation and electromagnetic interference shielding performance of epoxy composites modified with three-dimensional graphene aerogels
查看参考文献16篇
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文摘
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以三维结构的石墨烯气凝胶为填料,通过真空浸渍的方法,将环氧树脂浸入并固化,制备石墨烯气凝胶/环氧树脂复合材料。利用FT-IR,XPS和XRD等测试手段,研究制备过程和炭化处理中石墨烯气凝胶的化学结构变化。实验结果表明:氧化石墨烯和聚酰胺酸,通过物理吸附的方式,形成石墨烯气凝胶。300℃热处理使得聚酰胺酸亚胺化成聚酰亚胺,氧化石墨烯得到部分还原。随着炭化温度的提高,石墨烯气凝胶中的石墨烯片层还原程度越高,聚酰亚胺炭化程度越高。与此同时,扫描电镜和光学显微镜结果表明,炭化处理和真空浸渍后,石墨烯气凝胶仍然可以保持良好的三维网络结构。在此基础上,石墨烯气凝胶作为导电填料,利用其三维网络结构,使得对应的复合材料具有良好的导电性能和电磁屏蔽性能。在石墨烯气凝胶含量仅为6.23%(质量分数)时,复合材料的电导率就可以达到252S·m~(-1),电磁屏蔽效能高达75dB。 |
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其他语种文摘
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Graphene aerogels/epoxy composites were prepared by vacuum-impregnated process with graphene aerogels as the functional filler and epoxy resin as polymer matrix.The changes in chemical structure of graphene aerogels during the preparation process and carbonization treatment were investigated by FT-IR,XPS and XRD.The results show that GO@PAA aerogel is prepared by the physical interaction between graphene oxide(GO)and polyamide acid(PAA).PAA will be transformed to polyimide by imidization and graphene oxide is partially reduced during the 300 ℃ thermal treatment.With the carbonation temperature increases,reduction degree of graphene sheets and the carbonation degree of polyimide are increased gradually.Meanwhile,SEM images and OM images show that graphene aerogels can also maintain the good three-dimensional network structure after carbonation treatment and vacuum impregnation.On this basis,graphene aerogels,which serve as the functional filler,taking advantage of the good three-dimensional network structure,can improve the corresponding composites with good electrical property and electromagnetic interference shielding performance.With only 6.23%(mass fraction)graphene aerogels(G@C-1100),the corresponding composites exhibit high electrical conductivity of 252S·m~(-1) and an excellent electromagnetic interference shielding effectiveness of 70dB. |
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来源
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材料工程
,2021,49(5):82-88 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2020.000509
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关键词
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石墨烯气凝胶
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环氧树脂
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复合材料
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电磁屏蔽性能
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地址
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1.
中国航发北京航空材料研究院软材料技术研究中心, 北京, 100095
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中国航发北京航空材料研究院, 先进复合材料国防科技重点实验室, 北京, 100095
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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一般工业技术 |
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基金
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国家自然科学基金国家杰出青年科学基金
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文献收藏号
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CSCD:6973165
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