Wettability of Heat-Treated Wood

Pétrissans, Mathieu; Gérardin, Philippe; Bakali, Idriss El; Serraj, M.

doi:10.1515/hf.2003.045

Cited by 189 publications

(144 citation statements)

References 11 publications

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“…Oliveira et al (2010) described the same wettability behavior found in this study. Pétrissans et al (2005) suggested that wettability decreases due to increase of cellulose crystallinity, whereas Hakkou et al (2005) reported that changes in the conformational arrangement of wood is related to the lignin plasticization or the residual water.…”

Section: Physical Propertiesmentioning

confidence: 99%

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Cademartori

Missio

Mattos

et al. 2015

An. Acad. Bras. Ciênc.

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The effect of thermal treatments on physical and mechanical properties of rose gum and Sydney blue gum wood was evaluated. Wood samples were thermally modified in a combination: pre-treatment in an autoclave (127°C -1h) and treatment in an oven (180-240°C -4h); and only treatment in an oven at 180-240°C for 4h. Chemical changes in the structure of woods were evaluated through infrared spectroscopy. Evaluation of physical properties was performed through mass loss, specific gravity, equilibrium moisture content and dimensional stability tests. Surface changes were analyzed through apparent contact angle technique and static bending tests were carried out to evaluate the mechanical behavior. Use of pre-treatment in autoclave affected the properties analyzed, however oven, resulted in the highest changes on wood from both species. Chemical changes were related to the degradation of hemicelluloses. Moreover, a significant decrease of hygroscopicity and mechanical strength of thermally modified woods was observed, while specific gravity did not significantly change for either of the species studied. The best results of decrease of wettability were found in low temperatures, while dimensional stability increased as a function of temperature of exposure in oven. The highest loss of mechanical strength was observed at 240°C for both species.

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Section: Physical Propertiesmentioning

confidence: 99%

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Cademartori

Missio

Mattos

et al. 2015

An. Acad. Bras. Ciênc.

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“…The results are that the mechanical properties of the wood decrease, and dimensional stability and biological resistance of the wood increase (Tjeerdsma et al 1998, Jamsa and Vitainemi 2001, Yildiz 2002, Petrissans et al 2003, Gündüz et al 2008, Can et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Comparative biological resistance of differently thermal modified wood species against decay fungi, Reticulitermes grassei and Hylotrupes bajulus

Sivrikaya

Can

Troya³

et al. 2015

Maderas, Cienc. tecnol.

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Thermal modified wood has some advantages over natural wood, including decreased hygroscopicity, increased dimensional stability, and enhanced durability. In this study, European species of Scots pine (Pinus sylvestris), spruce (Picea orientalis), ash (Fraxinus spp.), and tropical species of tali (Erythrophleum ivorense), and iroko (Chlorophora excelsa) were thermally treated at 180 °C and 210 °C for 1,5 and 2 h, respectively. We evaluated the resistances of the untreated and thermally treated samples to decay induced by the white rot fungus, Trametes versicolor and two brown rot fungi, Coniophora puteana and Postia placenta. In addition, the samples were exposed to the termite Reticulitermes grassei and the longhorn beetle species Hylotrupes bajulus to evaluate their resistance to damage by the insects. During the heat treatment, the mass loss of the samples generally was between 9 and 14%. After the heat treatment, experiments were conducted to determine the effects of white and brown rot fungi on samples of Scots pine and tali, the effect of C. puteana on spruce, and the effects of C. puteana and P. placenta on ash and iroko. In all experiments, the mass loss due to damage from the various fungi was less than 1% for the samples that had been heat treated at 210 °C. The untreated and heat-treated tropical species exhibited higher durability with very low mass loss and 100% mortality of the insects when attacked by termites, whereas the other wood species had moderate attack. In addition, Hylotrupes bajulus exposure by two standart methods (EN 46 and 47) resulted in similar performances in most cases, although EN 47 treated samples at 210 °C showed improved durability for Scots pine (Pinus sylvestris) and spruce (Picea orientalis).

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“…The TMP prepared at 170 °C also developed a darker color than the other two TMP types. According to previous studies on thermal treatment of softwood in dry and moist conditions (Sivonen et al 2002;Pétrissans et al 2003;Yin et al 2011), the equilibrium moisture content is expected to be lower for the HT-TMPs. This can be at least partly explained by the degradation of hemicelluloses at elevated temperatures.…”

Section: Preparation Of Tmp Fibersmentioning

confidence: 94%

Composites of High-Temperature Thermomechanical Pulps and Polylactic Acid

Solala¹,

Koistinen²,

Siljander³

et al. 2015

BioResources

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a High-temperature thermomechanical pulps (HT-TMP, defibrated at 150 to 170 °C) were compared to a reference TMP (defibrated at 130 °C) as a reinforcement for polylactic acid (PLA). Composites were prepared by melt compounding, followed by injection molding, gradually increasing the used fiber content from 0 to 20 wt.%. The injection-molded specimens were characterized by tensile and impact strength tests, scanning electron microscopy, water absorption tests, and differential scanning calorimetry. The TMP fiber damage was also characterized before and after melt compounding by optical analysis. At 20% fiber content, the Young's modulus increased significantly, while the tensile strength remained unchanged and the impact strength decreased slightly. All fibers suffered damage during melt compounding, but the tensile strength remained about the same as in pure PLA. All types of TMP were able to increase the PLA rate of crystallization. The HT-TMP fibers were dispersed more evenly in PLA than the 130 °C TMP. The 170 °C TMP produced composites of lower water absorption than the other two TMP types, probably because of its lower hemicellulose content and its higher surface coverage by lignin.

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Wettability of Heat-Treated Wood

Cited by 189 publications

References 11 publications

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Comparative biological resistance of differently thermal modified wood species against decay fungi, Reticulitermes grassei and Hylotrupes bajulus

Composites of High-Temperature Thermomechanical Pulps and Polylactic Acid

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