Chemical Analysis of Densification, Drying, and Heat Treatment of Scots pine (Pinus sylvestris L.) through a Hot-Pressing Process

Li, Lili; Wang, Ximing; Wu, Feiyu

doi:10.15376/biores.11.2.3856-3874

Cited by 10 publications

(7 citation statements)

References 48 publications

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“…There was a significant difference in mean extractive content between groups AC and BD, as can be seen in Table 1. The extractive content may increase due to the degradation of hemicelluloses and lignin, which may generate new extractives (Liu et al 2014;Li et al 2016). Table 2 shows the results obtained for the physical and mechanical properties of the samples from the groups low in lignin content and high in lignin content.…”

Section: Chemical Composition Of Control and Densified Woodmentioning

confidence: 99%

“…In the densification process, a reduction in hemicellulose content has been reported (Li et al 2016). This chemical component of the wood is relevant because the main role of the hemicelluloses is to act as a bonding material between the microfibrils, allowing their mobility in the deformation process (Keckes et al 2003).…”

Section: Effect Of Chemical and Physical-mechanical Features In Thm Pmentioning

confidence: 99%

See 1 more Smart Citation

Impact of the Chemical Composition of Pinus radiata Wood on its Physical and Mechanical Properties Following Thermo-Hygromechanical Densification

Cruz¹,

Bustos²,

Aguayo³

et al. 2018

BioResources

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The thermo-hygromechanical densification process changes the chemical composition and the physical and mechanical properties of wood. The aim of this work was to study the impact of the chemical composition of Pinus radiata wood on its physical and mechanical properties following the thermo-hygromechanical densification process. The samples were initially segregated by lignin content. Density, hardness, modulus of elasticity (MOE), and modulus of rupture (MOR), in addition to lignin, α-cellulose, hemicellulose, and extractive contents, were determined before and after the densification process. The results indicated that densified wood with high initial lignin content had greater rate of increases in density and MOE than wood with lower initial lignin content. Additionally, densified wood with lower initial lignin content had greater rate of increases in hardness. The rate of increase of MOR did not show significant differences within both groups. Carbohydrates present in the control and the densified wood played an important role in the mechanical strength of the final product.

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Section: Chemical Composition Of Control and Densified Woodmentioning

confidence: 99%

Section: Effect Of Chemical and Physical-mechanical Features In Thm Pmentioning

confidence: 99%

Impact of the Chemical Composition of Pinus radiata Wood on its Physical and Mechanical Properties Following Thermo-Hygromechanical Densification

Cruz¹,

Bustos²,

Aguayo³

et al. 2018

BioResources

View full text Add to dashboard Cite

show abstract

“…Additionally, under these circumstances, new extractives can be generated when the wood is thermally treated due to the degradation of other components, such as lignin [ 46 , 47 ]. This generation of new extractives is reflected in its increase from 1.8% to 7.2% in PR and from 1.9% to 6.7% in EG.…”

Section: Resultsmentioning

confidence: 99%

Analytical Pyrolysis of Pinus radiata and Eucalyptus globulus: Effects of Microwave Pretreatment on Pyrolytic Vapours Composition

Venegas-Vásconez,

Arteaga-Pérez,

Aguayo

et al. 2023

Polymers

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Pinus radiata (PR) and Eucalyptus globulus (EG) are the most planted species in Chile. This research aims to evaluate the pyrolysis behaviour of PR and EG from the Bío Bío region in Chile. Biomass samples were subjected to microwave pretreatment considering power (259, 462, 595, and 700 W) and time (1, 2, 3, and 5 min). The maximum temperature reached was 147.69 °C for PR and 130.71 °C for EG in the 700 W-5 min condition, which caused the rearrangement of the cellulose crystalline chains through vibration and an increase in the internal energy of the biomass and the decomposition of lignin due to reaching its glass transition temperature. Thermogravimetric analysis revealed an activation energy (Ea) reduction from 201.71 to 174.91 kJ·mol−1 in PR and from 174.80 to 158.51 kJ·mol−1 in EG, compared to the untreated condition (WOT) for the 700 W-5 min condition, which indicates that microwave pretreatment improves the activity of the components and the decomposition of structural compounds for subsequent pyrolysis. Functional groups were identified by Fourier transform infrared spectroscopy (FTIR). A decrease in oxygenated compounds such as acids (from 21.97 to 17.34% w·w−1 and from 27.72 to 24.13% w·w−1) and phenols (from 34.41 to 31.95% w·w−1 and from 21.73 to 20.24% w·w−1) in PR and EG, respectively, was observed in comparison to the WOT for the 700 W-5 min condition, after analytical pyrolysis. Such results demonstrate the positive influence of the pretreatment on the reduction in oxygenated compounds obtained from biomass pyrolysis.

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“…In addition, the reduction in hemicellulose content has many hygroscopic sites and reduces free hydroxyl groups (-OH), reducing the moisture acquired from the environment. resulting in increased resistance to the deterioration of heat-modified wood (Dubey et al 2011, Li et al 2016.…”

Section: Biological Resistance Of the Particleboardsmentioning

confidence: 99%

Wettability and decay of particleboards manufactured with thermally treated sugarcane residue and bamboo (Dendrocalamus asper) particles

Brito¹,

Bortoletto²,

Paes

2022

Maderas, Cienc. tecnol.

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This study aimed to evaluate the chemical composition of wood particles (control and treated), and the effects of thermal modification and adhesive levels on the wettability and biological resistance of particleboards made of sugarcane residue and bamboo (Dendrocalamus asper). Therefore, 75% bamboo particles and 25% sugarcane residue (bagasse) were used for producing the particleboards. The particles were treated at 220 °C for 3h35min. Urea formaldehyde (UF) adhesive was used in three solid contents (10%, 12% and 14%) based on the dry mass of the particles. The mat was cold pre-consolidated (pressure of 0,5 MPa for 5 min) and after hot consolidated (3,45 MPa, 180 ºC, 10 min). Water and ethylene glycol and two measurement times were used to measure the contact angle. Gloeophyllum trabeum and Rhodonia placenta (brown rot) and Trametes versicolor (white rot) fungi were used for the biological resistance test. There was a change in the chemical composition of the treated particles such as a reduction in the levels of lignin (bagasse and bamboo), total extracts and holocellulose (bagasse). The thermal treatment increased the final contact angles obtained with water. The particleboard surfaces were classified as non-wettable and partially wettable to the tested solvents. The thermal treatment provided biological resistance improvements in the particleboards to the tested fungi, being classified as very resistant to Rhodonia placenta, resistant to very resistant to Gloeophyllum trabeum, and moderate to resistant to Trametes versicolor.

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Chemical Analysis of Densification, Drying, and Heat Treatment of Scots pine (Pinus sylvestris L.) through a Hot-Pressing Process

Cited by 10 publications

References 48 publications

Impact of the Chemical Composition of Pinus radiata Wood on its Physical and Mechanical Properties Following Thermo-Hygromechanical Densification

Impact of the Chemical Composition of Pinus radiata Wood on its Physical and Mechanical Properties Following Thermo-Hygromechanical Densification

Analytical Pyrolysis of Pinus radiata and Eucalyptus globulus: Effects of Microwave Pretreatment on Pyrolytic Vapours Composition

Wettability and decay of particleboards manufactured with thermally treated sugarcane residue and bamboo (Dendrocalamus asper) particles

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