Effects of Ageing on the Color and Surface Chemistry of Paulownia Wood (P. elongata) from Fast Growing Crops

Liu, Xin You; Timar, Maria Cristina; Varodi, Anca Maria; Song, Yang

doi:10.15376/biores.11.4.9400-9420

Cited by 15 publications

(9 citation statements)

References 43 publications

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“…The FT-IR spectrum of W sample presented in Table S5 (column a) shows all the characteristic bands of wood. The allocation of vibration bands was attributed based on the literature data. , The FT-IR spectra of W and W/DGEBA/RAMA/EVOs, recorded before and after 500 h irradiation time, are presented in Figure . The FT-IR spectrum of the non-irradiated W sample, presented in Figure a, shows all the characteristic bands of wood.…”

Section: Resultsmentioning

confidence: 99%

Photochemical Aging of Eco-Friendly Wood Coatings Derived from Vegetable Oils

Roşu¹,

Mustaţă²,

Roşu³

et al. 2021

ACS Appl. Polym. Mater.

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Eco-friendly polymer coatings for wood surface protection against ultraviolet (UV) radiation were synthesized from grapeseed, soybean, and linseed epoxidized oils and diglycidyl ether of bisphenol A cross-linked with a resin acid/maleic anhydride adduct. Pine wood was coated with the synthesized formulations through immersion followed by a thermal curing protocol, resulting in semi-transparent film-covered surfaces. The wood and coated wood samples were exposed to 500 h of UV irradiation (λ = 365 nm) during which color changes were correlated with structural modifications, through Fourier transform infrared spectroscopy. Color changes indicated an improved resistance to UV radiation of the coated samples compared to pristine wood. Reflectance spectra measurements were also undertaken. Gloss retention increased and mass loss decreased for the coated wood samples during UV irradiation compared to non-coated wood. The coatings were tested in terms of water absorption, adhesion, and hardness. The coated wood surfaces showed reduced water absorption, good adhesion, and increased hardness during UV irradiation. All presented data recommend the eco-friendly films as future candidates for wood surface protective coatings against the destructive action of environmental factors.

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Section: Resultsmentioning

confidence: 99%

Photochemical Aging of Eco-Friendly Wood Coatings Derived from Vegetable Oils

Roşu¹,

Mustaţă²,

Roşu³

et al. 2021

ACS Appl. Polym. Mater.

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“…As for EAM, the bands were all studied and interpreted in the pseudo-absorbance spectra as the Nakdong technique caused a very high surface roughness (Figure 5) and a consequent predominant presence of the diffuse contribution [60]. EAM surface without depositions displays the bands related to wood around 1740 cm −1 (νC=O, hemicellulose) and at 1595, 1510, 1460, and 1240 cm −1 (lignin-related bands) [61][62][63][64][65] (Figure 9). Conversely, in the KK transformed spectra (Figure 10), WM displays the spectral profile of the oil-colophony varnish with characteristic bands around 3000 and 2800 cm −1 (νCH 3 and νCH 2 ), around 1735 cm −1 (νC=O), at 1460 and 1380 cm −1 (δC-H), and at 1250 cm −1 and 1170 cm −1 (νC-O) [12,63,66].…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Preliminary Cleaning Approach with Alginate and Konjac Glucomannan Polysaccharide Gel for the Surfaces of East Asian and Western String Musical Instruments

et al. 2022

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The cleaning of string musical instruments is challenging due to the traditional finishing treatments used by the makers. Multilayered coating systems were applied to Western musical instruments, while the Nakdong technique was applied in East Asia. Furthermore, by restorations and performance, dust and grime were overlapped together with polishes, adhesives, and varnishes. Gel cleaning is important in the field of conservation because of the ability to selectively remove chemical and biological degradation products from the surface, minimizing the interactions with the inner layers. In this study, hydrogels based on sodium alginate (SA) and konjac glucomannan (KG) polysaccharides were applied on laboratory mock-ups of East Asian and Western instruments to test their ability to remove synthetic soiling and sweat from the surface. In particular, SA cross-linked with calcium cations and KG cross-linked with borate gels were used. To control the exposure of the cleaning solvent on the surface of mock-ups, the moisture content of the gels was determined. The effectiveness of removing synthetic contaminants was investigated by noninvasive analytical methods. Stereomicroscopy and colorimetry, together with Fourier Transform Infrared (FTIR) spectroscopy in reflection mode and X-Ray Fluorescence (XRF), were used to evaluate the cleaning efficacy. Overall, polysaccharide hydrogels resulted in promising cleaning systems on both smooth and rough surfaces of wood.

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“…The most degradative phenomena for outdoor wooden constructions are sun radiation and the leaching effect of rain. 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].…”

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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Effects of Ageing on the Color and Surface Chemistry of Paulownia Wood (P. elongata) from Fast Growing Crops

Cited by 15 publications

References 43 publications

Photochemical Aging of Eco-Friendly Wood Coatings Derived from Vegetable Oils

Photochemical Aging of Eco-Friendly Wood Coatings Derived from Vegetable Oils

Preliminary Cleaning Approach with Alginate and Konjac Glucomannan Polysaccharide Gel for the Surfaces of East Asian and Western String Musical Instruments

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

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