Wood-derived nanostructured hybrid for efficient flame retarding and electromagnetic shielding

作者：Chen, Junqing; Zhu, Zhaodong; Zhang, Hui^*; Tian, Shenglong; Fu, Shiyu^*

来源：MATERIALS & DESIGN, 2021, 204: 109695.

DOI：10.1016/j.matdes.2021.109695

• Nanostructured wood
• PANI
• Flame retardancy
• Photothermal conversion
• Electromagnetic shielding

Delignified wood with 3D porous structure provides a good platform for constructing multifunctional electromagnetic shielding materials. The objective of this work is to fabricate a non-carbonized nanostructured wood composite by in-situ polymerization of aniline in H3PO4 acidic medium for flame retar-dancy and electromagnetic shielding. The wood aerogel with hierarchical porous structure after removing lignin and hemicellulose is almost composed of cellulose and provided a satisfactory 3D network structure. The wood porous channels were coated with polyaniline (PANI) by in-situ polymerization providing a high conductivity (22.07 S/m). The polyaniline-wood aerogel (PANI-WA) with a thickness of 2-3 mm showed a good electromagnetic interference (EMI) shielding effectiveness of 27.63 dB in the X band (8.2-12.4 GHz). Notably, the material simultaneously possesses excellent flame retardancy, which can self-extinguish and retain its original shape after repeated ignition. PANI-WA also exhibits the ability of photothermal conversion under near-infrared (NIR) irradiation. The interesting PANI-WA has a good potential application for electromagnetic shielding materials with flame retardancy and photothermal conversion under NIR.