State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, China.
Department of Chemistry, University of Manchester, Manchester, UK.
Int J Biol Macromol. 2023 Mar 1;230:123295. doi: 10.1016/j.ijbiomac.2023.123295. Epub 2023 Jan 14.
Biomass-based multifunctional electromagnetic shielding materials have attracted extensive interest in academia and industry due to the sustainability of biomass and the environmental adaptability of multifunctional materials. After removing lignin and hemicellulose wood become a porous substrate with aligned cellulose, which is a good platform for building cellulose-based materials. In this work, a cellulose composite with sandwich-like structure was constructed by in-situ polymerization of aniline on delignified wood and coating a PDMS/CNT layer. Benefiting from the natural porous hierarchical structure and the constructed multilayer continuous conductive network, the PDMS/CNT/PANI WA exhibits excellent electrical conductivity (18.6 S/m) and electromagnetic shielding performance (shielding efficiency value of 26 dB at the X band (8.2-12.4 GHz)). The synergistic effect of PANI and CNT endowed the material with excellent flame retardancy (HRR, THR and HRC decreased by 84 %, 53.4 % and 83.3 %) and significant antibacterial activity. Moreover, PDMS imparts a water contact angle of 105° to the material, which acts as a protective layer, further improves the durability of the material. This work provides a new strategy for developing sustainable and multifunctional electromagnetic shielding materials.
基于生物质的多功能电磁屏蔽材料由于生物质的可持续性和多功能材料的环境适应性而引起了学术界和工业界的广泛关注。去除木质素和半纤维素后，木材变成具有定向纤维素的多孔基质，这是构建纤维素基材料的良好平台。在这项工作中，通过苯胺在脱木质素木材上的原位聚合和 PDMS/CNT 层的涂覆，构建了具有三明治状结构的纤维素复合材料。得益于天然多孔分级结构和构建的多层连续导电网络，PDMS/CNT/PANI WA 表现出优异的电导率（18.6 S/m）和电磁屏蔽性能（在 X 波段（8.2-12.4 GHz）的屏蔽效率值为 26 dB）。PANI 和 CNT 的协同作用赋予了材料优异的阻燃性（HRR、THR 和 HRC 分别降低了 84%、53.4%和 83.3%）和显著的抗菌活性。此外，PDMS 赋予材料 105°的水接触角，充当保护层，进一步提高了材料的耐久性。这项工作为开发可持续和多功能电磁屏蔽材料提供了新策略。
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