Decay resistance and dimensional stability improvement of wood by low melting point alloy heat treatment

Okon, Kufre Edet; Lin, Fengcai; Chen, Yandan; Huang, Biao

doi:10.1007/s11676-017-0537-x

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…The combined wood modification technology of resin impregnation and heat treatment (IMPG-HT) aims at not only improving mechanical properties and dimensional stability, but also enhancing the durability and changing the color of wood to imitate that high-performance precious wood. Thus, wood modified with this combined technology has great potential to be used in the field of high-grade furniture, flooring, special furniture and building [11][12][13][14][15]. Previous studies on IMPG-HT wood focused on treatment technology and properties improvement of wood after modification.…”

Section: Introductionmentioning

confidence: 99%

Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood

Jin

Cai

et al. 2020

PLoS ONE

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To investigate the effects of urea-formaldehyde (UF) resin impregnation combined heat treatment (IMPG-HT) on the pyrolysis behavior of poplar wood, the chemical composition, pyrolysis characteristics, pyrolysis kinetics, and gaseous products released during pyrolysis of untreated (control), IMPG-HT, IMPG and HT woods were analyzed. The results demonstrate that IMPG-HT changes pyrolysis behavior of poplar wood significantly. Unlike the control and HT samples, the thermogravimetric / derivative thermogravimetric (TG/DTG) curves of IMPG wood shift toward lower temperature, and the shoulder on DTG curves weaken or even disappear. The maximum mass loss rate of IMPG-HT samples decreases, and carbon residual yield increases to 23% or more and activation energy (E) increases sharply after conversion rate (α) reaching 0.80. HT improves the thermal stability of IMPG wood, which is represented by the increase of decomposition temperature (T d ) and DTG peak temperature (T peak ) and the higher E value of IMPG-HT wood. For the pyrolysis gaseous products, IMPG-HT wood produces nitrogen-containing gases (HNCO and NH 3 ) due to the presence of UF resin, but the amounts of these gases are less than that produced by IMPG wood because the heat treatment had removed part of N elements. (2020) Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood. PLoS ONE 15(3): e0229907. https://doi.org/ 10.Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood PLOS ONE | https://doi.org/10.1371/journal.pone.0229907 March 17, 2020 2 / 15 Fig 5. The linear fitting diagrams of IMPG-HT samples. (a) The linear fitting diagrams of IMPG-HT samples obtained by FWO method within the conversion range of 0.10<α<0.90; (b) The linear fitting diagrams of IMPG-HT samples obtained by KAS method within the conversion range of 0.10<α<0.90.

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Section: Introductionmentioning

confidence: 99%

Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood

Jin

Cai

et al. 2020

PLoS ONE

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“…On the other hand, relatively high rate of mass loss occurred at a slightly higher temperature of 359°C for silicone oil heat treated P. massoniana wood at 210 for 8 h compared to the untreated (Figure 2b). This can be explained by the fact that silicone oil heat treatment significantly modified the chemical components of the wood and the heat treated P. massoniana wood showed more chemically homogeneous structure, composed mainly of cellulose and lignin (Okon et al 2018a). Immense mass loss was obtained between the temperatures of 240 °C to 380 °C, as indicated in the TG peak.…”

Section: Thermal Propertiesmentioning

confidence: 96%

Physicochemical properties of Pinus massoniana wood subjected to silicone oil heat treatment

Okon¹,

Udoakpan²

2019

Maderas, Cienc. tecnol.

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In this study, Pinus massoniana wood was heat treated with silicone oil to modify the chemical composition relative to the unmodified wood. Specifically, polysaccharide, lignin, extractives and ash contents were the properties investigated. The wood samples were first of all pre-heated in a micro-wave oven to ease heat transfer within the wood. Silicone oil heat treatment was carried out at 150, 180 and 210°C for 2, 4, 8 h. The silicone oil heat treated wood was characterized by Fourier transformed infrared (FTIR), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and contact angle. Results showed that silicone oil heat treatment caused significant decrease in the polysaccharide (P ˂ 0,0001) and ash contents (P ˂ 0,0001) and significant increase in the lignin (P ˂ 0,0001) and extractives contents (P ˂ 0,0001) as the treatment time increased. FTIR results showed that the chemical constituents of the wood were affected by the treatment, while TGA showed that the treated wood resulted in higher thermal stability with increase in the crystallinity index. Silicone oil heat treatment proved to be effective in increasing the contact angle of the wood.

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Effect of tin-bath treatment on anatomical properties of Firmiana simplex wood

Okon¹,

Akpan²,

Okon³

et al. 2020

MOJES

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Wood modification in general, is an environmental non-biocide method to modify and improve certain wood properties to enable its utilization for diverse purpose. In this study, Firmiana simplex wood was modify using low melting point tin-alloy as the heat-treatment medium. The anatomical properties of the tin-bath treated wood were studied using a light microscope and scanning electron microscope analysis. Microscopic analyses with a light microscope showed that the morphologies of the wood were less smashed by the impact of the treatment with no deformation of the vessels after tin-alloy treatment while scanning electron microscope revealed collapse in the wood structures with damages to the cell walls and vessels. It was also evident from scanning electron microscope analyses that tin-alloy penetrated the wood structure, therefore forming a film covering the cell walls and partly occupying the wood cell lumens.

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Decay resistance and dimensional stability improvement of wood by low melting point alloy heat treatment

Cited by 3 publications

References 25 publications

Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood

Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood

Physicochemical properties of Pinus massoniana wood subjected to silicone oil heat treatment

Effect of tin-bath treatment on anatomical properties of Firmiana simplex wood

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