Properties of Pinus modified with silicon–titanium binary oxides

Plantation poplar is one of the most commonly used fast-growing woods in China. However, it can be easily weathered by climatic conditions (such as sunlight irradiation, rain, temperature change and oxidation), resulting in the degradation of wood properties. UV-induced discoloration is a noticeable issue to wood for outdoor use. In this study, titanium dioxide (TiO2) nanoparticles were modified onto the surface of wood via 3-isocyanatopropyltriethoxysilane (IPTS) bridge. Artificial accelerated QUV weathering tests were carried out to evaluate the anti-weathering properties after IPTS-TiO2 modification. During treatment, TiO2 nanoparticles were bonded with IPTS and grafted onto the wood surface with isocyanate group. TiO2 nanoparticles played a role as UV filter, reducing degradation, and IPTS helped reduce the discoloration of wood. From FTIR results, the photodegradation of lignin was inhibited effectively during the weathering process. After artificial weathering, the values of L*, a* and b* of the IPTS-TiO2 treated wood were 80.16, 5.27 and 21.06, respectively. The results suggest the feasibility of IPTS-TiO2 modification for improving the anti-weathering properties of polar wood and providing an effective strategy for industrial wood modification.

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Fabrication of Silica–Titanium Composite Film on Wood Surface and Optimization of Its Structure and Properties

Liu,

Li,

Cheng

et al. 2024

Forests

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In this thesis, wood loaded with a silica–titanium (Si-Ti) composite film was prepared using the sol–gel method in order to achieve improved wood with high hydrophobicity and photocatalytic activity under visible light. The factors affecting the structure and properties of the composite film, as well as the optimization process, were discussed. Infrared analysis revealed that the vibrational intensity of Si-O-Si, Ti-O-Ti, and Ti-O-Si telescopic vibration peaks increased with an increase in vinyltriethoxysilane (VETS). Additionally, the number of Ti-O-Ti telescopic vibration peaks also increased with an increase in VETS. Furthermore, the intensity of -NO3, Si-O-Si, and Ti-O-Ti telescopic vibrational peaks was enhanced with a higher dosage of nitric acid. Conversely, the intensity of -OH telescopic vibrational peaks decreased with an increase in drying temperature. XRD analysis showed that nitric acid could promote the transformation of TiO2 from amorphous to anatase, while SiO2 would reduce the grain size of anatase TiO2 and promote the growth of rutile TiO2. Additionally, wood surfaces loaded with Si-Ti composite film changed from hydrophilic to hydrophobic, with significant differences observed between different levels of each factor. The photocatalytic activity of surface-loaded Si-Ti composite films on wood was most affected by the amount of nitric acid, which influenced crystallinity of TiO2 and thus impacted the photocatalytic activity. Furthermore, changes in VTES dosage not only affected the crystalline phase of TiO2 and the grain size of Si-Ti composite film but also influenced the crystallinity of TiO2 through generating SiO2. Finally, based on optimal preparation process (titanium–alcohol ratio of 1:5, titanium–silicon ratio of 1:0.2, titanium–acid ratio of 1:0.5, and drying temperature of 100 °C), wood surfaces loaded with Si-Ti composite film achieved a contact angle up to 125.9° and exhibited a decolorization rate for rhodamine B under UV light reaching 94% within 180 min.

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Properties of Pinus modified with silicon–titanium binary oxides

Cited by 3 publications

References 16 publications

Weathering properties of wood treated with 3-isocyanatopropyltriethoxysilane-TiO2

Weathering properties of wood treated with 3-isocyanatopropyltriethoxysilane-TiO2

IPTS-TiO2 treated wood with anti-weathering properties by UV shielding

Fabrication of Silica–Titanium Composite Film on Wood Surface and Optimization of Its Structure and Properties

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