A spectrocolorimetric study on the effect of ultraviolet irradiation of four tropical hardwoods

Pastore, Tereza Cristina Monteiro; Santos, Kelly O; Rubim, Joel C.

doi:10.1016/j.biortech.2003.10.035

Cited by 79 publications

(53 citation statements)

References 14 publications

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“…Table 1 shows the colour parameters and colour change ΔE for samples before and after conditioning after the last period of irradiation (96 hours). The discoloration development of both species corresponded to colour changes stated in literature (Pastore et al, 2004;Costa et al, 2010;Srinivas and Panday, 2012). All three parameters had slightly higher values after conditioning.…”

Section: Rezultati I Raspravasupporting

confidence: 77%

“…The reddish brown heartwood of Jatoba is characterized by distinct darkening if it is exposed to sunlight (Jankowska et al, 2011;Baar and Gryc, 2012). The minor effect of UV light on chromatic parameters with slight reddening was showed for Jatoba (Pastore et al 2004; Costa et al 2010). Decrease in value of lightness and increase in the chromaticity parameters a and b was observed in light coloured Hevea by Srinivas and Pandey (2012).…”

Section: Introduction 1 Uvodmentioning

confidence: 94%

“…The temperature of wood surface exposed to sunlight depends on its darkness; sun-irradiated wood can reach 60 °C, or even 90 °C if it is dark enough (Tolvaj et al, 2011). During wood photodegradation experiments under artifi cial conditions, higher temperatures ranging between 40 and 60 °C are often used in the testing chamber for a period of up to 500 hours (Chang et al, 2010;Tolvaj and Mitsui, 2005;Blanchard and Blanchet, 2011;Pastore et al, 2004). This temperature is high enough for wood drying, especially where it is applied in the long term.…”

Section: Introduction 1 Uvodmentioning

confidence: 99%

See 2 more Smart Citations

Change of Wood Moisture Content During Artificial Light Irradiation and its Influence on Colour Measurement

2015

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Section: Rezultati I Raspravasupporting

confidence: 77%

Section: Introduction 1 Uvodmentioning

confidence: 94%

Section: Introduction 1 Uvodmentioning

confidence: 99%

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Change of Wood Moisture Content During Artificial Light Irradiation and its Influence on Colour Measurement

2015

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“…The use of hydrophobic layers instead of traditional coating systems has the advantage of easier application (only 1 layer of hydrophobization is sufficient). However, hydrophobic coatings only prevent damage caused by water and do not protect the underlying wood against UV and visible (VIS) spectra causing decomposition of lignin and extractives [28,29], and they are associated with chemical and colour changes [30,31]. For wood stabilization, it is possible to use protective pigments which are used as parts of coatings [25], as well as nanoparticles [32][33][34][35], UV stabilizers [36], and HALS applied in the penetration protective layer [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

et al. 2017

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Abstract:The durability of transparent coatings applied to an oak wood exterior is relatively low due to its anatomic structure and chemical composition. Enhancement of the protection of oak wood against weathering using transparent hydrophobic coatings is presented in this study. Oak wood surfaces were modified using UV-stabilizers, hindered amine light stabilizer (HALS), and ZnO and TiO 2 nanoparticles before the application of a commercial hydrophobic topcoat. A transparent oil-based coating was used as a control coating system. The artificial weathering test lasted 6 weeks and colour, gloss, and contact angle changes were regularly evaluated during this period. The changes in the microscopic structure were studied with confocal laser scanning microscopy. The results proved limited durability against weathering of both tested hydrophobic coatings. The formation of micro-cracks causing the leaching of degraded wood compounds and discolouration of oak wood were observed after 1 or 3 weeks of the weathering test. Until then, an oil-based coating film had protected the wood sufficiently, but after 6 weeks the wood was fully defoliated to its non-homogenous thickness, which was caused by the presence of large oak vessels, and by the effects of specific oak tannins. Using transparent hydrophobic coatings can prolong the service life of the exteriors of wood products by decreasing their moisture content. Without proper construction protection against rainwater, the hydrophobic coating itself cannot guarantee the preservation of the natural appearance of wood exteriors.

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“…Following the research, it was stated that the highest loss in value with UV radiation in CIE L*a*b* parameters (∆L, ∆a and ∆b) was observed in the characteristics of Marupa wood; Angelim vermelho wood was less affected (Pastore et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Effects of water-soluble varnishes on red color tone in wood material colored with water-soluble wood stains

Yalinkiliç

Sönmez²

2015

Turk J For

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In this study, changing effect of water-soluble varnishes on red color tone in different wood materials which were colored with water-soluble wood stains in brown tone has been researched. For this purpose, samples which were prepared from the Oriental beech (Fagus orientalis L.), Sessile oak (Quercus petreae L.) and Scots pine (Pinus sylvestris L.) woods in accordance with TS 53 and TS 2470, after being colored with aniline, ready-mix and chemical stains according to ASTM-E 1347-97, were coated with one-component and two-component waterborne varnishes according to ASTM-D 3023. Color changes were determined in accordance with ASTM 2244. According to research results, the highest color change in red color tone was obtained on oak wood colored with ready-mix stain and after coated with one-component waterborne varnishes; and the lowest change was obtained on Scots pine wood colored with chemical stain and after coated with two-component varnishes.

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A spectrocolorimetric study on the effect of ultraviolet irradiation of four tropical hardwoods

Cited by 79 publications

References 14 publications

Change of Wood Moisture Content During Artificial Light Irradiation and its Influence on Colour Measurement

Change of Wood Moisture Content During Artificial Light Irradiation and its Influence on Colour Measurement

Efficacy of Hydrophobic Coatings in Protecting Oak Wood Surfaces during Accelerated Weathering

Effects of water-soluble varnishes on red color tone in wood material colored with water-soluble wood stains

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