Influence of Post-extraction on Photostability of Thermally Modified Scots Pine Wood during Artificial Weathering

Shen, Haiying; Cao, Jinzhen; Sun, Wenjing; Peng, Yao

doi:10.15376/biores.11.2.4512-4525

Cited by 14 publications

(10 citation statements)

References 32 publications

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“…The thermally modified specimens showed initial rapid change of color similar to that of unmodified specimens, followed by a continuous change in both chroma and lightness during the test period. This tendency was also shown in previous studies (Srinivas and Pandey 2012;Shen et al 2016). After 55 days, the values of the coordinates were even more stable, which may have been due to a decrease in sunlight exposure after the specimens were turned towards the north.…”

Section: Color Changes Due To Outdoor Weathering Testsupporting

confidence: 86%

Methacrylic resin for protection of wood from discoloration by mould growth and weathering

Kim

Karlsson

Myronycheva

et al. 2020

BioRes

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The discoloration of uncoated wood surfaces in both outdoor and indoor use in non-heated spaces has become an increasing problem in European timber constructions due to the use of less toxic substances for protection and also changes in outdoor climate conditions, necessitating the use of protective coatings. To investigate the effect of methyl methacrylic (MMA) resin for the protection of wood from discoloration and mould growth, resin-treated wood surfaces were studied in a laboratory-scale mould test, as well as in an outdoor weathering test. Non-modified Scots pine and Norway spruce were used, and some of the test materials were also thermally modified. The resin suppressed mould growth for the laboratory-scale experiments. The protective effect was considerably reduced for outdoor tests. The MA resin did not effectively prevent the wood from greying from ultraviolet (UV) radiation exposure; there was some protective effect detected on the pine. The Fourier transform infrared (FTIR) spectra of weathered specimens showed a reduction of lignin-associated absorption bands for all treatments, which corresponded to the UV degradation and greying of the wood surface. It is suggested that MMA resin may provide adequate protection against mould growth on wood without direct exposure to rain and sunshine (e.g., attics, basements, etc).

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Section: Color Changes Due To Outdoor Weathering Testsupporting

confidence: 86%

Methacrylic resin for protection of wood from discoloration by mould growth and weathering

Kim

Karlsson

Myronycheva

et al. 2020

BioRes

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“…Although WPCs have potential application in the fabrication of windows, their decorative effect and durability performance are critical issues that should be considered for their practical application (Azwa et al 2013). The WPCs are made of polymers and wood flour (WF), which experience photo-degradation upon exposure to ultraviolet (UV) light (Peng et al 2014a;Shen et al 2016). The outdoor applications expose windows to a range of harsh environments (e.g., humidity, basic, acid and alkaline solutions, temperature, freeze-thaw, thermal cycles, UV light, etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of Carbon Black and Titanium Dioxide on Ultraviolet Weathering of Wood Flour-HDPE/Lumber Composites Using Multi-phase Co-extrusion Technology

Wang

Song

2017

BioResources

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A new type of wood-plastic/lumber composite (WPLC) was fabricated with laminated veneer lumber as a core, and the traditional wood-plastic composite (WPC) as a shell layer using multi-phase co-extrusion technology. This WPLC was used to manufacture a window frame, and the effects of inorganic pigments (carbon black (CB), titanium dioxide (TiO2), and their mixtures) on the decorative effect and ultraviolet (UV) weathering performance of the shell layer of the window frame were investigated. Weathering variables included UV irradiation duration and water spraying cycles for up to 6000 h. The surface color was analyzed by spectrophotometry during weathering. In addition, a scanning electron microscopy analysis and Fourier transform infrared spectroscopy analyzed the weathering properties of the WPLC shell layer. The results showed that (1) different decorative effects (white, grey, and black color) of the window frames were achieved by incorporating CB, TiO2, and their mixture; (2) the composites incorporated with CB and/or TiO2 exhibited less discoloration and fewer surface cracks; (3) the composites with CB and TiO2 showed a better photo-stability than those with a UV stabilizer (UV326). The overall color change (△E) of the composites incorporated with UV326, TiO2, and CB was 20.0, 11.7, and 10.8, respectively, after 3000 h of weathering; and (4) a combination of CB and TiO2 showed a synergistic effect on alleviating the photo-oxidation process of the WPC shell layers, which confirmed its UV-shielding effect.

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“…Even where light-induced discolouration was controlled by this treatment, spectroscopic data still showed marked degradation due to heat treatment. 377 The presence of different types of extractives 378 , 379 in wood might account for the variability in results; extractives are organic compounds in wood that can be extracted with solvents. Variables affecting the level of UV stability delivered by thermal treatment of wood has to be further studied before it can find widespread commercial use in outdoor applications.…”

Section: Heat Treatment Of Wood To Control Degradation By Uv Radiation Shows Mixed Results With the Majority Of Studies Indicating No Advmentioning

confidence: 99%

Environmental effects of ozone depletion and its interactions with climate change: Progress report, 2016

Panel¹

2017

Photochem Photobiol Sci

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The Parties to the Montreal Protocol are informed by three Panels of experts. One of these is the Environmental Effects Assessment Panel (EEAP), which deals with two focal issues. The first focus is the effects of UV radiation on human health, animals, plants, biogeochemistry, air quality, and materials. The second focus is on interactions between UV radiation and global climate change and how these may affect humans and the environment. When considering the effects of climate change, it has become clear that processes resulting in changes in stratospheric ozone are more complex than previously believed. As a result of this, human health and environmental issues will be longer-lasting and more regionally variable. Like the other Panels, the EEAP produces a detailed report every four years; the most recent was published as a series of seven papers in 2015 (Photochem. Photobiol. Sci., 2015, 14, 1-184). In the years in between, the EEAP produces less detailed and shorter Progress Reports of the relevant scientific findings. The most recent of these was for 2015 (Photochem. Photobiol. Sci., 2016, 15, 141-147). The present Progress Report for 2016 assesses some of the highlights and new insights with regard to the interactive nature of the direct and indirect effects of UV radiation, atmospheric processes, and climate change. The more detailed Quadrennial Assessment will be made available in 2018.

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Influence of Post-extraction on Photostability of Thermally Modified Scots Pine Wood during Artificial Weathering

Cited by 14 publications

References 32 publications

Methacrylic resin for protection of wood from discoloration by mould growth and weathering

Methacrylic resin for protection of wood from discoloration by mould growth and weathering

Effects of Carbon Black and Titanium Dioxide on Ultraviolet Weathering of Wood Flour-HDPE/Lumber Composites Using Multi-phase Co-extrusion Technology

Environmental effects of ozone depletion and its interactions with climate change: Progress report, 2016

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