Zhang Lina, Song Guojun, Zhao Zetian, Ma Lichun, Xu Hui, Wu Guanglei, Song Yinghu, Liu Yinuo, Qiu Lihan, Li Xiaoru
Institute of Polymer Materials, School of Material Science and Engineering, Qingdao University, Qingdao 266071, China.
Gels. 2022 Sep 28;8(10):618. doi: 10.3390/gels8100618.
Three-dimensional (3D) graphene oxide aerogel (GOA) is one of the best fillers for composites for microwave absorption. However, its further development has been hindered by the poor mechanical properties. Methodology to improve the mechanical properties of the aerogel remains an urgent challenge. Herein, graphene oxide/carbon nanotube/epoxy resin composite aerogel (GCEA) was successfully prepared by a facile method. The results showed that the prepared GCEA with the hierarchical and 3D cross-linked structures exhibited excellent compression performance, structural and thermal stability, high hydrophilicity, and microwave absorption. The prepared GCEA recovered from multiple large strain cycles without significant permanent deformation. The minimum reflection loss (RL) was -39.60 dB and the maximum effective absorption bandwidth (EAB) was 2.48 GHz. The development of the enhanced GO aerogels will offer a new approach to the preparation of 3D microwave-absorbing skeletal materials with good mechanical properties.
三维（3D）氧化石墨烯气凝胶（GOA）是用于微波吸收复合材料的最佳填料之一。然而，其较差的机械性能阻碍了它的进一步发展。提高气凝胶机械性能的方法仍然是一项紧迫的挑战。在此，通过一种简便的方法成功制备了氧化石墨烯/碳纳米管/环氧树脂复合气凝胶（GCEA）。结果表明，所制备的具有分级和3D交联结构的GCEA表现出优异的压缩性能、结构和热稳定性、高亲水性以及微波吸收性能。所制备的GCEA从多个大应变循环中恢复，没有明显的永久变形。最小反射损耗（RL）为-39.60 dB，最大有效吸收带宽（EAB）为2.48 GHz。增强型氧化石墨烯气凝胶的开发将为制备具有良好机械性能的3D微波吸收骨架材料提供一种新方法。
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