All-biobased multilayer transparent wood infiltrated with cellulose and chitosan nanofibers: Improving anisotropic mechanical and ultraviolet shielding properties

초록

Recently, wood, a renewable material, has been developed for transparent wood (TW) that can be used for smart windows, solar cells, thermal energy storage, printed electronics, smart packaging, and aesthetics. Although TW has benefited from carbon neutralization, its orientation effect on the mechanical properties and petroleumbased filler are drawbacks. Thus, this report presents the conversion of all-biobased anisotropic single-layer transparent wood (S-TW) to isotropic multilayer transparent wood (M-TW) through self-bonding and hot pressing at 50 degrees C. Chitosan (CTS) and cellulose nanofiber (CNF) were infiltrated into the porous bleached wood to form all-biobased S-TW. The M-TW exhibits a good tensile strength of 115.2 MPa and 127.4 MPa, with Young's modulus of 8.4 GPa and 7.0 GPa for the CNF and CTS infiltrated M-TWs, respectively. Additionally, M-TW exhibits a transmittance of approximately 70-80 % and a haze of about 70-75 % at 600-800 nm wavelength range. To showcase potential applications of all-biobased TWs, a smartphone protective touchscreen and ultraviolet shielding of windows are demonstrated.

키워드