Wood degradation under UV irradiation: A lignin characterization

Cogulet, Antoine; Blanchet, Pierre; Landry, Véronic

doi:10.1016/j.jphotobiol.2016.02.030

Cited by 180 publications

(107 citation statements)

References 43 publications

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“…It has a slight effect on the mechanical properties of materials (Cogulet et al 2016) owing to the limited penetration of wood by light . Thus, the MOE, MOR, and HS values of the samples after weathering were not tested.…”

Section: Physical and Mechanical Properties Bending Strengthmentioning

confidence: 99%

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Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

Rao¹,

Chen²,

Li³

et al. 2017

BioResources

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aOutdoor bamboo-fiber-reinforced composites (OBFRCs) with four different densities were prepared, and the microstructure and physicomechanical properties of pristine samples were evaluated. In addition, the surface color, glossiness, roughness, water absorption, and wettability of the samples were tested to investigate the effects of panel density on the extent of surface weathering due to ultraviolet radiation. The results showed that the OBFRCs exhibited excellent physical and mechanical properties, which improved with increasing density. However, increases in the density led to decreases in the hygroscopicity and dimensional stability of the OBFRCs. After weathering, the surface contact angle and surface roughness increased, and the dimensional stability improved. The surface glossiness, water absorption, and surface free energy decreased. A higher density resulted in improved color stability, which suggested that density played an important role in determining surface photodegradation properties. Thus, densityincreasing treatments had positive effects on the physical and mechanical properties as well as the color stability and wettability of the OBFRCs, but they may negatively affect the roughness and dimensional stability. Based on service-performance and cost-minimization considerations, 1.1 g/cm 3 was determined as the most appropriate density for general applications.

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Section: Physical and Mechanical Properties Bending Strengthmentioning

confidence: 99%

“…First, the pristine samples were sanded before the weathering treatment. For the weathered samples, the surface lignin underwent degradation during the outdoor exposure treatment, which resulted in the formation of a cellulose layer on the surface (Evan et al 2005;Cogulet et al 2016), as well as yellowing (Müller et al 2003) (Fig. 6).…”

Section: Roughnessmentioning

confidence: 99%

Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

Rao¹,

Chen²,

Li³

et al. 2017

BioResources

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show abstract

“…As a result of the weathering process and color changes, micro and macro cracks are formed in the wood, gloss is lost, surface roughness increases, and the erosion rate of the surface escalates . Lignin absorbs light at short wavelengths (295‐400 nm) and is the wood component most vulnerable to weathering . Preservatives and modification of wood can significantly influence its behavior under weathering.…”

Section: Introductionmentioning

confidence: 99%

Surface characterization of wood treated with boron compounds combined with water repellents

Can

Sivrikaya

2019

Color Research & Application

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Longer weathering exposure periods are more reliable for end‐use performance evaluations of wood surfaces. This study aimed to investigate the effect of boron impregnation on the surface composition and color of Scots pine (Pinus sylvestris L.) wood exposed to 18 months of natural weathering in the West Black Sea Region of Turkey. All measurements were performed at 6 month intervals. Samples were first impregnated with boron compounds and then for a second time using five different water‐repellent materials. Polyethylene glycol and aluminum sulfate were introduced with the boric acid as single impregnations. With increased weathering time, the samples darkened, while sodium silicate kept the color change to a minimum. Nano boron‐impregnated samples exhibited more effective results than those impregnated with boric acid. The FTIR analysis results demonstrated that the impregnation process had caused significant changes in the chemical structure of the samples. The changes in the chemical structure of the wood resulting from the impregnation process were partially maintained during the weathering.

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“…Thus, an ozone lamp consisting of UV wavelengths of 254 nm and 185 nm will be effective to elicit the photochemical decomposition of lignin. However, Cogulet et al [18] reported that irradiation of stems of white spruce at 340 nm UV-A is able to degrade lignin. If a combination of different UV-A wavelengths is used for pretreatment of micronised wood powder, the cellulolytic activity of rumen microorganisms may be accelerated in ruminal fermentation of micronised wood powder.…”

Section: A-cmentioning

confidence: 99%

“…On the other hand, a photochemical reaction using ultraviolet (UV) light is available to decompose lignin [18,19]. In addition, ozone, which is a powerful oxidant, can break down lignin [20,21].…”

Section: Introductionmentioning

confidence: 99%

Effects of micronised wood powder irradiated with ultraviolet light and exposed to ozone gas on in vitro ruminal fermentation in beef cattle

Hamano¹,

Takahashi²,

Agematu³

2017

Anim Husb Dairy Vet Sci

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Wood degradation under UV irradiation: A lignin characterization

Cited by 180 publications

References 43 publications

Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

Preparation and Characterization of Outdoor Bamboo-Fiber-Reinforced Composites with Different Densities

Surface characterization of wood treated with boron compounds combined with water repellents

Effects of micronised wood powder irradiated with ultraviolet light and exposed to ozone gas on in vitro ruminal fermentation in beef cattle

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