Abstract
Fast-growing wood has disadvantages, such as loose surface structure, poor weather resistance, high moisture absorption, and poor dimensional stability, which severely limit its value and application. In this paper, Polydimethylsiloxane (PDMS) was used to treat the fast-growing poplar veneer to improve the microstructure of the wood surface and provide a smooth substrate for depositing ZnO film. Nano-ZnO/PDMS double-layer structure wood was prepared by magnetron sputtering, and its structure, microscopic morphology, surface elements, anti-photochromic properties, and hydrophobic properties were characterized and tested. The results showed that the nano-ZnO/PDMS modified fast-growing wood did not destroy the natural structure of the wood. When the sputtering time was 120 min, the characteristic diffraction peaks of ZnO(100), ZnO(002), and ZnO(101) appeared near 2θ of 31.8°, 34.4°, and 36.3°. The weight percentage of surface Zn elements reached 55.09%, and the total color difference value of the nano-ZnO/PDMS double-layer structure wood (120 min) was 3.85, which was 80.4% lower than that of poplar veneer, showing obvious resistance to light discoloration. The sputtered ZnO nanoparticles can effectively combine with the PDMS-treated wood to form a ZnO film with a certain degree of crystallinity. The surface water contact angle reached 146.2°, which is close to superhydrophobicity and can maintain good hydrophobicity for a long time. In conclusion, the preparation of nano-ZnO/PDMS double-layer structure wood by magnetron sputtering formed a nanoscale rough interface, which enhanced the hydrophobic properties and anti-photochromic properties of fast-growing wood.
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This work was supported by the Fundamental Research Funds for the Central Universities (2572020BC08).
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Xiao, Z., Wang, Y., Song, Y. et al. Functional improvement of fast-growing wood based on nano-ZnO/PDMS double-layer structure. Wood Sci Technol 57, 275–288 (2023). https://doi.org/10.1007/s00226-022-01441-7
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DOI: https://doi.org/10.1007/s00226-022-01441-7