Review
Forestry
Juan A. Martin, Rosana Lopez
Summary: In recent years, the demand for wood has increased globally, but the production of woods with low natural durability is often insufficient to meet this demand. Wood-decay fungi are the main agents that deteriorate wood, followed by saproxylic beetles, termites, and marine molluscs and crustaceans. The natural durability of wood is determined by factors such as the composition of lignin, xylem anatomy, heartwood extractives, and moisture regulation components, which affect the resistance of wood to wood-destroying organisms.
Article
Chemistry, Applied
Qing Chen, Jinyue Dai, Peizhan Cao, Guangming Lu, Xiaoqing Liu
Summary: A main-chain type benzoxazine (MCBZ) resin that can be quickly shaped under UV light was successfully synthesized and directly coated into a film, with wide processing window, low curing temperature, excellent static antifouling effect, and sterilization effect. The d12-DHBP-MCBZ resin was prepared from dodecamine and 4, 4'-dihydroxy-benzophenone. By adjusting the ratio of d12-DHBP-MCBZ to TMPTMA, hydrophilic benzoxazine coatings can be prepared, suitable for fouling-resisting coatings. The coatings exhibited fast shaping under UV light and a post-curing temperature of only 140 degrees C, with excellent hydrophilicity to prevent fouling organisms' adhesion, and a high sterilization performance of >99% for the Poly(BZ/20 %TMA) coating.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Chemistry, Physical
Haiyan Yin, Maziar Sedighi Moghaddam, Mikko Tuominen, Andra Dedinaite, Magnus Walinder, Agne Swerin
Summary: This study investigated the effect of prolonged UV irradiation on the performance of superhydrophobized birch and acetylated birch wood. The results showed that the combination of surface modification using silicone nanofilaments and wood acetylation provided good wetting resistance even after prolonged UV exposure. Scanning electron microscopy images revealed that the silicone nanofilaments were still present on the wood samples after UV irradiation. Additionally, the surface-modified wood samples exhibited significant color change and degradation of lignin after UV exposure.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Kent Davis, Scott Leavengood, Jeffrey J. Morrell
Summary: The study compared the performance of 12 exterior wood coatings on 5 wood species, finding that most coatings lost their protective effects within 1 year mainly due to biological degradation and UV radiation, making it difficult to protect exposed wood. This provides a guide for users wishing to specify coatings for exposed wood in mass timber structures.
Article
Materials Science, Multidisciplinary
Dan Rosu, Fanica R. Mustata, Liliana Rosu, Cristian-Dragos Varganici
Summary: Eco-friendly polymer coatings synthesized from various oils were found to enhance wood surface protection against UV radiation, resulting in reduced water absorption, improved adhesion, and increased hardness during UV irradiation. These coatings are recommended as future candidates for protecting wood surfaces from environmental factors.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Polymer Science
Hui Shi, Yongqing Ni, Hongwu Guo, Yi Liu
Summary: Dyed wood is prone to photoaging under UV irradiation, leading to decreased decorative effect and service life. The photodegradation behavior of dyed wood holocellulose, the main component, is not well understood. In this study, dyed wood and holocellulose from Maple birch (Betulacostata Trautv) were exposed to UV accelerated aging treatment to investigate the changes in chemical structure and microscopic morphology caused by UV irradiation. The results show that UV radiation does not significantly affect the lattice structure of dyed wood fibers. With prolonged UV radiation, the relative crystallinity of dyed wood and holocellulose shows a trend of initially increasing and then decreasing, but the overall change is not significant. UV radiation breaks the chemical bonds in the non-crystalline region of dyed holocellulose, causing photooxidation degradation and prominent surface photoetching features. The morphological damage and destruction of wood fibers ultimately lead to the degradation and corrosion of dyed wood. Studying the photodegradation of holocellulose is helpful in understanding the photochromic mechanism of dyed wood and improving its weather resistance.
Article
Materials Science, Multidisciplinary
Sabine Briede, Oskars Platnieks, Anda Barkane, Igors Sivacovs, Armands Leitans, Janis Lungevics, Sergejs Gaidukovs
Summary: The modern coating market is dominated by unsustainable fossil resources such as acrylic, polyurethane, and polyester polymer resins. This study proposes the use of biobased components to produce wood coatings with improved performance properties. By using vegetable oil acrylates as a matrix and a biobased monomer called propoxylated glycerol triacrylate (GPT), the researchers were able to tailor the properties of the UV crosslinked network. The addition of GPT significantly improved the material's storage modulus, crosslink density, and glass transition temperature.
Article
Polymer Science
Chia-Wei Chang, Kun-Tsung Lu
Summary: In this study, antibacterial agents with various metals were synthesized and modified processes were investigated to improve the yields. Zn(HEEP)(2) showed promising antibacterial activity against Escherichia coli when used in UV-cured wood floor coatings. The films containing Zn(HEEP)(2) had lower gloss and abrasion resistance but slightly increased hardness compared to films without Zn(HEEP)(2) addition.
Article
Green & Sustainable Science & Technology
Yoshikuni Teramoto, Takumi Ito, Chihiro Yamamoto, Toshiyuki Takano, Hironari Ohki
Summary: This study uses mid-infrared spectroscopy and machine learning to detect inapparent deterioration in waterborne acrylic wood coatings containing cellulose nanofibers. The results demonstrate the potential of machine learning in identifying subtle changes in coatings and facilitating cost-efficient and environmentally sustainable maintenance strategies for wood surfaces.
ADVANCED SUSTAINABLE SYSTEMS
(2023)
Article
Chemistry, Applied
Xiu Li, Di Wang, Longying Zhao, Xingzhou Hou, Li Liu, Bin Feng, Mengxin Li, Pai Zheng, Xuan Zhao, Shuangying Wei
Summary: An environmentally friendly waterborne wood coating with rapid curing speed and good mechanical properties was developed by introducing AESO and PETA to a UV-curable waterborne PUA resin. The optimal mechanical properties were achieved with 45% AESO content, with the emulsion having particle size smaller than 50 nm. The coating displayed excellent stability, uniform distribution, and cured quickly under UV LED light source.
PROGRESS IN ORGANIC COATINGS
(2021)
Article
Chemistry, Applied
Yishuai Huang, Tongtong Ma, Liping Li, Qingwen Wang, Chuigen Guo
Summary: This study explored the facile synthesis and organic-solvent-free application of renewable flame-retardant coatings on wood surfaces. Waterborne unsaturated resins and monomers were prepared through esterification and used to prepare flame-retardant UV-curable coatings. The waterborne coatings exhibited favorable physical properties and significantly improved the flammability of wood.
PROGRESS IN ORGANIC COATINGS
(2022)
Review
Chemistry, Applied
Ingrid Calvez, Sorour Davoudi, Caroline R. Szczepanski, Veronic Landry
Summary: UV-curable coatings have advantages such as low environmental impact and increased production rates, but achieving an optimal combination of high mechanical performance and low-gloss aesthetics remains a challenge.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Biotechnology & Applied Microbiology
Anita Ljubic, Susan L. Holdt, Jette Jakobsen, Anette Bysted, Charlotte Jacobsen
Summary: The study demonstrated that light conditions significantly affect the accumulation of bioactive compounds in microalgae, and optimizing growth conditions by adjusting light quality and quantity can increase the accumulation of high-value compounds.
JOURNAL OF APPLIED PHYCOLOGY
(2021)
Article
Construction & Building Technology
Kanotha Kamau-Devers, Sabbie A. Miller
Summary: A viscoelastic micromechanical creep model was proposed to accurately capture material deterioration in bio-based wood polymer composites under moisture and prolonged loading. Experimental and morphological data were used to validate the model and guide the design of more environmentally sustainable composites.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Environmental
Minoo Azadi, Sina Siavash Moghaddam, Amir Rahimi, Latifeh Pourakbar, Jelena Popovic-Djordjevic
Summary: The study indicates that UV-B radiation has a significant impact on plant morphology and biochemical traits, but AgNPs can alleviate UV-B stress and improve plant growth and yield.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)