Zeng Shulong, Huang Zhao-Xia, Jiang Hao, Li Yijun
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China.
National Engineering Research Center of Novel Equipment for Polymer Processing; Key Laboratory of Polymer Processing Engineering, Ministry of Education; Guangdong Provincial Key Laboratory of Technique and Equipment for Macromolecular Advanced Manufacturing; School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou 510641, China.
ACS Appl Mater Interfaces. 2020 Nov 18;12(46):52038-52049. doi: 10.1021/acsami.0c16169. Epub 2020 Nov 6.
With the popularization of 5G communications and the internet of things, electromagnetic wave (EW) radiation pollution has aroused much concern from the public, and the search for new materials and technologies for preparing electromagnetic shielding materials still continues all around the world. However, the contradiction among high shielding performance, economic applicability, and flexibility is still not well balanced. Herein, we fabricated a novel foldable leather solid waste (LSW)/polyvinyl alcohol (PVA)/silver (Ag) paper with excellent electromagnetic interference (EMI)-shielding ability using a facile but sustainable electroless plating (ELP) method with LSW as the resource. Taking PVA as a cross-linker, debundled leather fibers (LFs) generated by solid-state shearing milling could generate a flexible LSW/PVA substrate with a high specific surface area, and eventually the deposited Ag layer served as a protective layer not only to significantly improve the mechanical and thermal robustness, but also to endow the LSW/PVA/Ag paper with good hydrophobicity, which could protect from potential moisture damage. In addition to the reflection effect of metallic Ag on EW, the hierarchical structure of collagen fibers played an important role in superior high EMI-shielding effectiveness (∼55-∼90 dB) by an absorption-dominant EMI-shielding mechanism. Furthermore, a multilayer LSW/PVA/Ag paper was also prepared with enhanced EMI-shielding effectiveness of 111.3 dB benefited by constructing multiple reflection-absorption interfaces. The high-performance, environmentally friendly, and low-cost EMI-shielding materials not only offered a new avenue toward recycling LSW in a more value-added way, but also displayed promising potential for application in flexible shielding materials or wearable clothing.
随着5G通信和物联网的普及，电磁波（EW）辐射污染已引起公众的广泛关注，世界各地仍在继续寻找制备电磁屏蔽材料的新材料和新技术。然而，高屏蔽性能、经济适用性和柔韧性之间的矛盾仍未得到很好的平衡。在此，我们以皮革固体废弃物（LSW）为原料，采用简便且可持续的化学镀（ELP）方法，制备了一种具有优异电磁干扰（EMI）屏蔽能力的新型可折叠皮革固体废弃物（LSW）/聚乙烯醇（PVA）/银（Ag）纸。以PVA为交联剂，通过固态剪切粉碎产生的解束皮革纤维（LFs）可生成具有高比表面积的柔性LSW/PVA基材，最终沉积的Ag层作为保护层，不仅显著提高了材料的机械和热稳定性，还赋予了LSW/PVA/Ag纸良好的疏水性，可防止潜在的水分损害。除了金属Ag对电磁波的反射作用外，胶原纤维的分级结构通过以吸收为主的EMI屏蔽机制，在实现卓越的高EMI屏蔽效能（约55 - 约90 dB）方面发挥了重要作用。此外，通过构建多个反射 - 吸收界面，还制备了多层LSW/PVA/Ag纸，其EMI屏蔽效能提高到了111.3 dB。这种高性能、环保且低成本的EMI屏蔽材料不仅为以更具附加值的方式回收LSW提供了一条新途径，还在柔性屏蔽材料或可穿戴服装的应用中显示出了广阔的前景。
