Natural weathering of sixteen wood species: Changes on surface properties

Arpaci, Sebnem Sevil; Tomak, Eylem Dizman; Ermeydan, Mahmut Ali; Yıldırım, İbrahim

doi:10.1016/j.polymdegradstab.2020.109415

Cited by 37 publications

(26 citation statements)

References 39 publications

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“…The peaks at 1590 cm -1 and 1506 cm -1 were assigned to the C=C aromatic skeletal vibration of lignin. The peak at 1458 cm -1 was assigned to the C-H deformation in lignin and the peak at 1230 cm -1 was assigned to C=O stretching vibration in lignin [1,36]. The same trend was observed for the band at 1420 cm -1 .…”

Section: Ftir Resultssupporting

confidence: 60%

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Evaluation of Weathering Performance of Rosin-Copper Based Treated Wood

Nguyen¹,

Tran²,

Nguyen³

et al. 2022

Journal of Renewable Materials

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This study aimed to evaluate the effect of natural weathering on some surface characteristics and mechanical properties of Styrax wood treated with mixtures of 1.0%, 2.0%, or 4.0% rosin sizing agent and 3% copper sulfate. Wood samples after treatment were exposed to outdoor conditions for one year and changes in color, glossiness, weight loss, compression strength parallel to grain (CSPG), modulus of rupture (MOR), and modulus of elasticity (MOE) were investigated after 6 and 12-month of natural weathering. The results showed that rosin-copper treatment could improve color stability and gloss of samples after weathering. Mass losses of all rosin-copper treated samples after 12 months of exposure were negligible compared with the untreated control samples. In addition, rosin-copper treatment enhanced the CSPG compared to untreated controls, but slightly decreased the MOR and MOE of Styrax wood before weathering. Natural weathering factors induced a reduction for all strength properties, however, the decrease rate for strength properties of rosin-copper treated samples was negligible compared with the untreated control samples after 12-month natural weathering exposure. The FTIR and SEM-EDX confirmed that the use of the rosin-copper formulations to impregnate wood could decrease the hazard of the copper preservative leaching into the environment, while also enhancing more resistance against weathering factors and other biotic factors.

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Section: Ftir Resultssupporting

confidence: 60%

“…4B). The decrease of these absorption peaks is a clear indication of the decrease of lignin and other aromatic compounds on the surface of weathered wood [36,37]. Other bands at 1364, 1318, 1156, 1052, 1030, and 897 cm -1 are mainly associated with carbohydrates mostly cellulose.…”

Section: Ftir Resultsmentioning

confidence: 95%

Evaluation of Weathering Performance of Rosin-Copper Based Treated Wood

Nguyen¹,

Tran²,

Nguyen³

et al. 2022

Journal of Renewable Materials

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“…The measurements on ImageJ are done in the RGB scale. However, most data reported in the literature for wood photodegradation is done in the CIEL*a*b* system [14]. To convert the RGB measurements into CIEL*a*b*, we can use the Python Colormath library [20].…”

Section: Methodsmentioning

confidence: 99%

“…Many experiments on wood photodegradation are conducted using natural sunlight. Results are significant and substantial, although it requires longer time period that can take hundreds of days [14,15]. Additionally, natural weathering is heavily reliant on the weather conditions, which are not constant and are difficult to control [16].…”

Section: Introductionmentioning

confidence: 99%

Application of image processing programs in color analysis of wood photodegradation

Plata

Santos²

2022

J. Phys.: Conf. Ser.

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In general, polymer photodegradation is an important aspect of polymer science that is of great interest to chemistry, materials science, biology, and physics students who engage in this field of research. Wood consists of three main polymers, which makes it a good candidate for such photodegradation studies. Aside from structural changes based on chemical analysis, color change assessment can also be employed to check any extent of degradation on wood without the need for sophisticated analytical equipment. This study presents the application of two image processing programs in color analysis of wood photodegradation: ImageJ and Colormath library, which are Java-based and Python-based software, respectively. Images of unexposed and UV-exposed wood samples were taken using a smartphone as an affordable digital camera. RGB channel values from these images were analyzed and quantified by ImageJ software. These values were converted to the corresponding CIEL*a*b* parameters using the Colormath library to calculate the color change, ΔE. For the 3-hour exposed sample, ?E is equal to 4.29. This value indicates appreciable color change, according to the criteria from literature. Regardless of the exposure time, the wood samples become darker as indicated by the negative value in the change in lightness L*

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“…The photodegradation of wood is a widely studied phenomenon [5][6][7][8][9][10]. The main chemical change generated by the photodegradation is the decomposition of lignin [11][12][13][14][15]. New carbonyl groups are generated as a product of lignin degradation [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of Water Leaching on Photodegraded Scots Pine and Spruce Timbers Monitored by FTIR Spectroscopy

Preklet

Tolvaj

Visi-Rajczi

et al. 2021

Forests

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The goal of this research was the systematic study and comparison of the divided individual effects of UV light irradiation and water leaching during artificial weathering. Spruce (Picea abies Karst.) and Scots pine (Pinus sylvestris L.) samples were irradiated by ultraviolet (UV) light. Another sequence of samples was treated with the combination of UV irradiation and water leaching. The total extent of UV treatment was 20 days for both series of samples. Time relation of UV irradiation and water leaching was 2:1. The chemical changes were observed by FTIR spectroscopy. The difference spectrum was used for determination of the chemical changes. Degradation of lignin was greater for the leached samples than for the pure UV treated samples. Scots pine suffered greater lignin degradation than spruce, and produced higher absorption increase on the absorption region of unconjugated carbonyls. The unconjugated carbonyl groups were the most responsive chemical elements to leaching. Spruce was more susceptible to leaching of unconjugated carbonyl groups than Scots pine. Two absorption bands of unconjugated carbonyl groups at 1706 and 1764 cm−1 wavenumbers were produced by photodegradation. The absorption band at 1764 cm−1 was more sensitive to water leaching than the band at 1706 cm−1.

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Natural weathering of sixteen wood species: Changes on surface properties

Cited by 37 publications

References 39 publications

Evaluation of Weathering Performance of Rosin-Copper Based Treated Wood

Evaluation of Weathering Performance of Rosin-Copper Based Treated Wood

Application of image processing programs in color analysis of wood photodegradation

Effect of Water Leaching on Photodegraded Scots Pine and Spruce Timbers Monitored by FTIR Spectroscopy

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