Surface characteristics of coated soft- and hardwoods due to UV-B ageing

Ncube, Elisha; Meincken, Martina

doi:10.1016/j.apsusc.2010.05.097

Cited by 9 publications

(4 citation statements)

References 24 publications

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“…Surface roughness data determined by AFM were used to study characteristics of coated soft and hardwoods. 17 Surface roughness can also be calculated by a special software from laser scanning confocal microscopy. 18 The method was used to assess the results of accelerated weathering of polyaramid and polybenzimidazole for firefighter protective clothing.…”

Section: Impedance Measurementmentioning

confidence: 99%

Analytical Methods in Uv Degradation and Stabilization Studies

2015

Handbook of UV Degradation and Stabilization

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Section: Impedance Measurementmentioning

confidence: 99%

Analytical Methods in Uv Degradation and Stabilization Studies

2015

Handbook of UV Degradation and Stabilization

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“…The coating materials can also undergo photodegradation processes (photolysis, photo-oxidation) under the action of UV light, resulting in property changes, including glass transition temperature, UV light transmittance, colour and their protective behaviour [29,30]. Different types of film-forming materials, such as: acrylic-polyurethanes [31], acrylics [28,29,[32][33][34] and polyurethanes [35], as well as natural products [36], have been studied in terms of behaviour and protective effect against light/UV-induced colour changes in wood surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…More studies have focused on the exposure of wood in outdoor conditions where UV radiation acts in conjunction with rainwater [2,32,45], while the topic of light-induced colour changes in indoor conditions by the natural light passing through the window glass [1,22,23,36] or light from artificial sources [26,27] has been less addressed, especially for clear-coated wood with natural aspect [46,48].…”

Section: Introductionmentioning

confidence: 99%

Light-Induced Colour Changes in Wood Surfaces in Indoor Conditions Determined by an Artificial Accelerated Test: Influence of Wood Species and Coating Materials

Torcătoru,

Timar

2024

Applied Sciences

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Stabilising the natural colour of wood species exposed to light in indoor conditions is a challenge that could be better addressed based on a deeper understanding of the occurring phenomena and influencing factors. This paper investigates comparatively the light-induced colour changes for three hardwood species, namely, European maple (Acer pseudoplatanus L.), European ash (Fraxinus excelsior L.) and European walnut (Juglans regia L.), as well as the influence of finishing with three types of clear, colourless waterborne lacquers: acrylic-polyurethane (F1), acrylic (F2) and polyurethane (F3) on their colour stability. Colour measurements in the CIELab system in conjunction with an artificial accelerated ageing test under the action of UV-VIS radiation, simulating natural light passing through window glass, and two types of test samples were employed to highlight the influence and contributions of the wood substrate and of the coating films to the global colour modifications. Coating films applied on 1 mm clear glass slides were employed as a sort of “detachable” finish for this purpose. Direct exposure to UV-VIS light caused visible colour changes for both uncoated and coated wood surfaces, the values of the calculated colour differences (ΔE) after a 72 h exposure being dependant on both the wood species and the coating material. Excepting two situations for walnut, statistically significantly higher colour differences were obtained for the uncoated samples: maple (9.36 units), ash (8.39 units), walnut (6.20 units), compared to the coated ones: maple (4.92–5.71 units), ash (2.25–3.94 units), walnut (4.74–7.70 units). The wood substrates underlying the coating films were found to bring the maximum contribution to the overall colour changes in the clear coated surfaces, while the coating films employed in this research demonstrated a fairly good colour stability to UV-VIS light exposure, with maximum colour changes (∆E) up to only 1.30 units. Overall, the wood species and the type of coating were found as influencing factors in interaction with the light-induced colour changes in wood surfaces in indoor conditions.

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“…Oxygen could attack the weak chemical bond of polymer chain such as double bond, hydrogen of tertiary carbon atoms and hydroxyl groups, which would cause rupture of main chain, decline of molecular weight and glass transition temperature. So the performance of polymer coatings would decrease and lead to aging [9][10][11][12][13][14][15][16][17] . Microorganisms such as mycete easily sticked on the polymer coatings and their metabolism products containing organic acids which would evoke discoloration, embrittlement and gloss loss.Mechanical stress could also affect the service life of the materials and probably played synergistic effects with other ageing parameters in marine environment.…”

Section: Introductionmentioning

confidence: 99%

Research and Development on the Antiaging Polymer Coatings

Liu

Cao

2014

AMR

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In recent years, polymer had been used in various situations and its use was increasing year by year. However, weathering was a complex process in which UV light, moisture and temperature variations all contributed to the deterioration of polymer properties. This paper reviewed the aging study progress of polymeric materials in recent years and the research problems. The evaluation methods of aging and antiaging of polymer materials were described, concerning with experiments, determinations and pathways of aging and antiaging. A relatively elaborate synthetical evaluation system of aging and antiaging was established.

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Surface characteristics of coated soft- and hardwoods due to UV-B ageing

Cited by 9 publications

References 24 publications

Analytical Methods in Uv Degradation and Stabilization Studies

Analytical Methods in Uv Degradation and Stabilization Studies

Light-Induced Colour Changes in Wood Surfaces in Indoor Conditions Determined by an Artificial Accelerated Test: Influence of Wood Species and Coating Materials

Research and Development on the Antiaging Polymer Coatings

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