Abstract
Super-hydrophobic phenomena generally exist in nature, and wood can also obtain hydrophobicity by specific processing on the surface, being like the construction of microscale rough surface or decoration with low surface energy materials. In this research, the formation of hydrophobic layers on wood surface was investigated without breaking the wood’s original structure. The core-shell structure particles were prepared by penetrating orthosilicate and polystyrene into the hollow mesoporous microsphere structure with tetrahydrofuran. A wood sample was coated with polydimethylsiloxane (PDMS) resin layer to enhance the adhesion of nano and micron hollow mesoporous microsphere on its surface. According to the surface structure of super-hydrophobic subjects in nature, the nano and micron hollow mesoporous microsphere were sprayed with different ratios several times to form a hydrophobic surface. The water contact angle could reach 150°, revealing that the hydrophobic behavior of the nano and micron hollow mesoporous microsphere coating was achieved. The microstructures of wood samples were examined by the scanning electron microscopy, and the chemical functional groups were investigated by the Fourier transform infrared; both verified that the hydrophobic surface was successfully coated. The thermogravimetric examination revealed the improved thermal stability of the hydrophobic wood. The scratch test was used to measure the abrasion resistance of the nano and micron hollow mesoporous microsphere coatings on wood surface. It was suggested that the nano and micron hollow mesoporous microsphere coating was an effective method to fabricate extremely hydrophobic wood products.
Highlights
Wood is a non-polluting, resource-rich, natural, and renewable biomass material
The mixed nano and micron hollow mesoporous microsphere layers exhibited to the hemicellulose component of wood began to decompose
The rate of weight remarkable hydrophobic performance on both the cross and tangential sections of wood, presenting loss increased rapidly above 200 ◦ C as hemicellulose of the wood decomposed, until approximately the water contact angle of up to 150°, which can be considered as superhydrophobic performance
Summary
Wood is a non-polluting, resource-rich, natural, and renewable biomass material. It has been placed in an extremely important position in various industries such as furniture, construction, ships, musical instruments, handicrafts, and buildings [1,2,3]. Polymers 2020, 12, 2856 of moisture in wood will inevitably lead to the change of wood size and anti-corrosion capability [7,8,9]. These uncertain factors will affect the scope of application and service life of wood [10,11]
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