Improvement of mechanical robustness of the superhydrophobic wood surface by coating PVA/SiO2 composite polymer

Liu, Feng; Wang, Shuliang; Zhang, Ming; Ma, Miaolian; Wang, Chengyu; Li, Jian

doi:10.1016/j.apsusc.2013.05.043

Cited by 104 publications

(51 citation statements)

References 13 publications

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“…Modifications changing the properties of wood in its entire volume, such as thermal treatment or acetylation, are a frequent treatment method [10,11]. For exposures without ground contact (Class 3 according to EN 350 [1]), it is possible to use hydrophobization in the form of a coating [12]. Hydrophobic coatings have the advantage of easier application and lower cost compared to thermal treatment, acetylation, or plasma treatment, and they also preserve the original appearance of the wood, thereby positively influencing human perception [13].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

et al. 2017

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Abstract:The durability of transparent coatings applied to an oak wood exterior is relatively low due to its anatomic structure and chemical composition. Enhancement of the protection of oak wood against weathering using transparent hydrophobic coatings is presented in this study. Oak wood surfaces were modified using UV-stabilizers, hindered amine light stabilizer (HALS), and ZnO and TiO 2 nanoparticles before the application of a commercial hydrophobic topcoat. A transparent oil-based coating was used as a control coating system. The artificial weathering test lasted 6 weeks and colour, gloss, and contact angle changes were regularly evaluated during this period. The changes in the microscopic structure were studied with confocal laser scanning microscopy. The results proved limited durability against weathering of both tested hydrophobic coatings. The formation of micro-cracks causing the leaching of degraded wood compounds and discolouration of oak wood were observed after 1 or 3 weeks of the weathering test. Until then, an oil-based coating film had protected the wood sufficiently, but after 6 weeks the wood was fully defoliated to its non-homogenous thickness, which was caused by the presence of large oak vessels, and by the effects of specific oak tannins. Using transparent hydrophobic coatings can prolong the service life of the exteriors of wood products by decreasing their moisture content. Without proper construction protection against rainwater, the hydrophobic coating itself cannot guarantee the preservation of the natural appearance of wood exteriors.

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Section: Introductionmentioning

confidence: 99%

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

et al. 2017

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“…Often, clouding, discolouring and checking defects in wood are caused by the hydrophilicity of the wood surface. Therefore, to overcome the wood’s defects and prolong the wood’s service life, the preparation of superhydrophobic wood is necessary2324. In general, a superhydrophobic wood surface can be prepared by two approaches: forming a layer of inorganic particles on the wood surface to create a rough structure or chemically modifying a rough surface with a low surface free energy (such as FAS-17)2526.…”

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confidence: 99%

A simple, one-step hydrothermal approach to durable and robust superparamagnetic, superhydrophobic and electromagnetic wave-absorbing wood

Wang

Yao

Wang

et al. 2016

Sci Rep

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In this work, lamellar MnFe2O4 was successfully planted on a wood surface through the association of hydrogen bonds via the one-pot hydrothermal method. Simultaneously, the fluoroalkylsilane (FAS-17) on the surface of the MnFe2O4 layer formed long-chain or network macromolecules through a poly-condensation process and provided a lower surface energy on the wood surface. The MnFe2O4/wood composite (FMW) presented superior superparamagnetism, superhydrophobicity and electromagnetic wave absorption performance. The results indicated a saturation magnetization of the FMW with excellent superparamagnetism of 28.24 emu·g−1. The minimum value of reflection loss of the FMW reached −8.29 dB at 16.39 GHz with a thickness of 3 mm. Even after mechanical impact and exposure to corrosive liquids, the FMW still maintained a superior superhydrophobicity performance.

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“…However, wood has also disadvantages, such as hygroscopic swelling, discoloration and degradation during weathering, and amenability to microbial decay (George et al 2005). There are many attempts to mitigate these effects, including heat treatment (Hakkou et al 2005), drop-coating (Liu et al 2013a), impregnation (Nami Kartal et al 2007;Cai et al 2008), atom transfer radical polymerization (Yu et al 2013), etherification (Chang and Chang 2006), sol-gel deposition (Tshabalala et al 2003;Mahltig et al 2008;Wang et al 2011), and hydrothermal synthesis of inorganic coating (Li et al 2010;Liu et al 2013b). The introduction of nanomaterials on wood surfaces has gained importance in the last decades, as this approach leads to wood protection by improved hydrophobicity, self-cleaning surfaces (Fu et al 2012), UV stability , and better fire resistance (Wang et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Formation and properties of polyelectrolytes/TiO₂ composite coating on wood surfaces through layer-by-layer assembly method

Rao

Liu

et al. 2015

Holzforschung

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A transparent and protective multilayer coating composed of poly(allylamine hydrochloride) (PAH), poly(styrene sulfonic acid) sodium salt (PSS), and nanoTiO 2 films was fabricated on wood surfaces by layerby-layer assembly method. The coating was formed through pre-immobilization of cationic PAH layer on wood substrate, followed by alternate soaking cycles in pH-controlled anionic PSS solution and TiO 2 colloidal solution. The structure and properties of the assembled coating were characterized through scanning electron microscopy (SEM), energy disperse X-ray analysis (EDXA), UV reflection and absorption, colorimetry, and contact angle (CA) measurement. Results revealed that the coverage uniformity and thickness were improved with increasing number of PSS/TiO 2 bilayers. The coating masked the cell wall ultrastructure while leaving the microscale features intact. The anatase TiO 2 in the assembled coating enhanced the UV stability of wood and resulted in a lowered photochromism. Furthermore, the photocatalytic capability of the nano-TiO 2 films in degrading dyes of rhodamine B and methylene blue was verified. The nano-TiO 2 film on the top surface of the coating embodied a superhydrophilicity, showing selfcleaning and anti-fog capabilities. Stearic acid modification altered the superhydrophilicity to hydrophobicity with CA of 140°.

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Improvement of mechanical robustness of the superhydrophobic wood surface by coating PVA/SiO2 composite polymer

Cited by 104 publications

References 13 publications

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

A simple, one-step hydrothermal approach to durable and robust superparamagnetic, superhydrophobic and electromagnetic wave-absorbing wood

Formation and properties of polyelectrolytes/TiO₂ composite coating on wood surfaces through layer-by-layer assembly method

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Improvement of mechanical robustness of the superhydrophobic wood surface by coating PVA/SiO2 composite polymer

Cited by 104 publications

References 13 publications

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

A simple, one-step hydrothermal approach to durable and robust superparamagnetic, superhydrophobic and electromagnetic wave-absorbing wood

Formation and properties of polyelectrolytes/TiO2 composite coating on wood surfaces through layer-by-layer assembly method

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Formation and properties of polyelectrolytes/TiO₂ composite coating on wood surfaces through layer-by-layer assembly method