Influence of combined heat treatment and densification on mechanical properties of poplar wood

Sözbir, Gonca Düzkale; Bektaş, İbrahim; Ak, Ayşenur Kiliç

doi:10.4067/s0718-221x2019005000405

Cited by 12 publications

(7 citation statements)

References 19 publications

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“…Furthermore, all the properties were significantly decreased with the increase in exposure duration at 180 and particularly at 210 °C. Sözbir et al (2019) stated that MOE and MOR were negatively affected by the increase in temperature (120, 160, and 200 °C for 1 and 3 h). Esteves et al (2008) expressed that the effect of heat treatment (170-200°C for 2 and 24 h) is more pronounced in MOR than MOE for maritime pine.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of heating temperature and time on bending properties of Taurus cedar wood

Aydın¹

2021

Turkish Journal of Forestry | Türkiye Ormancılık Dergisi

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Heat treatment is one of the environmentally friendly and cost-effective modification methods applied for improvements of wood properties. However, influences of exposure duration and temperature should be known to provide balanced improvements for properties. In this study, effect of temperature (80, 120, 150, 180, and 210°C) and exposure duration (2, 5, and 8 h) on the longitudinal ultrasonic wave velocity, density, dynamic Modulus of Elasticity-MOE (Edyn), MOE in bending, and Modulus of Rupture (MOR) properties of Taurus cedar (Cedrus libani) was figured out. Edyn was predicted using ultrasonic wave velocity of 2.25 MHz longitudinal ultrasonic wave propagated through the longitudinal axis. The three-point bending test was performed to determine static mechanical properties. According to results, the highest adverse effects of extended duration and temperature were observed for MOR and followed by Edyn, and MOE in bending. Up to 150°C and 8 h treatment levels, some remarkable increases (15.3%) were observed particularly for MOE in bending. Coefficients of determinations were calculated as 0.83, 0.38, and 0.37 for Edyn vs MOE in bending, Edyn vs MOR, and MOE in bending vs MOR, respectively.

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Section: Resultsmentioning

confidence: 99%

Evaluation of heating temperature and time on bending properties of Taurus cedar wood

Aydın¹

2021

Turkish Journal of Forestry | Türkiye Ormancılık Dergisi

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“…19 Recently, the flame retardant wood composites were investigated and prepared by compressing wood scaffold, 20 impregnating flame retardants into wood pores through physical infiltration, 21,22 carbonization. 23 He et al reported the poplar samples were impregnated with ammonium polyphosphate (APP) and the samples exerted fire retardant effectiveness. 22 Nevertheless, APP was poor weather ability and easily extruded in moisture atmosphere, thus its application was limited.…”

Section: Introductionmentioning

confidence: 99%

“…The flammability of the wood materials represents a major restriction especially in wooden homes and furniture 19 . Recently, the flame retardant wood composites were investigated and prepared by compressing wood scaffold, 20 impregnating flame retardants into wood pores through physical infiltration, 21,22 carbonization 23 . He et al reported the poplar samples were impregnated with ammonium polyphosphate (APP) and the samples exerted fire retardant effectiveness 22 .…”

Section: Introductionmentioning

confidence: 99%

Improvement in Monterey pine of the flame retardancy, thermal conductivity, and mechanical performance through incorporating functional epoxy resin

et al. 2023

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Monterey pine is a renewable biomass resources with structural and chemical characteristics, but is limited by its flammability, poor mechanical properties, and subpar thermal conductivity (TC). Herein, a thermal conductive and flame retardant the multifunction epoxy resin (MEP) prepolymer was injected into the Monterey pine and subsequently cured. The results showed that impregnated MEP Monterey pine, maintained its original cellular structure under applied loads compared to pristine Monterey pine, thus, giving the composite wood better mechanical integrity than its neat counterpart, which served as thermally conductive pathways within the composites. The TC was measured to be 0.12 Wm−1 K−1 for pristine Monterey pine. Whereas, the infiltrated MEP/wood composite yielded a TC of 0.94 Wm−1 K−1 which correlates to a 683.3% enhancement. Besides, the tensile strength of the prepared composites in the longitudinal and radial directions were observed to be 75.0 and 21.7 MPa, and increased by 63.4% and 152.3% compared to that of pristine Monterey pine, respectively. Combustion tests revealed that the Monterey pine/MEP composites self‐extinguished after ignition and departing from the flame source while the pristine Monterey pine did not. It was deduced that the TC, fire retardancy, and mechanical performance of Monterey pine were simultaneously improved by injecting the multifunctional epoxy resin prepolymer, which provide a wide application potential in heat dissipation furniture field.Highlights The multifunction epoxy enhanced the multiple performance of Monterey pine. The wood composite yielded a high thermal conductivity. Monterey pine/MEP composites managed to self‐extinguish after ignition.

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“…During this process, the wood is deformed as its volume decreases, followed by an increase in its density and specific gravity [1][2][3][4]. Various processes have been attempted and shown to improve the physical and mechanical properties of densified wood [5][6][7][8]. Density can significantly increase, as well as Brinell hardness, MOE and MOR [5,8].…”

Section: Introductionmentioning

confidence: 99%

“…Various processes have been attempted and shown to improve the physical and mechanical properties of densified wood [5][6][7][8]. Density can significantly increase, as well as Brinell hardness, MOE and MOR [5,8]. One of the primary problems with all types of densified wood products is the lack of dimensional stability.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Hydroxide, Succinic Acid and Their Combination on Densified Wood Properties

Augustina

Wahyudi

Dwianto

et al. 2022

Forests

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The effect of NaOH, succinic acid and their combination used as pretreatments on selected properties of densified wood samples of pisang putih (Mezzettia spp.), nyatoh (Palaquium spp.) and sepetir (Sindora spp.) has been studied. The properties of these samples were then compared with those of untreated wood (control) and densified wood samples without any pretreatment (HD wood). For alkali-pretreatment, after immersion in 10% NaOH (w/w) for 1, 2 and 3 h, the samples were immediately compressed; for acid-pretreatment, the sample was impregnated with 10% succinic acid (w/w) using a vacuum of −50 kPa for 30 min and a pressure of 7 bar for 2 h before pressing; while for the combination-pretreatment, the sample was initially immersed in 10% NaOH then impregnated with 10% succinic acid (w/w) and finally densified/compressed. Compression was applied in a radial direction and carried out in an open system using a hot press machine at 180 °C and 7 MPa specific pressure for 30 min with a 40% compression ratio. The results showed that densified wood with or without pretreatment had a higher specific gravity (SG) than the control, whereas sepetir wood showed the greatest increase in SG. The alkali- and combination-pretreatments resulted in a higher C-set value than in the control, HD and acid-pretreated samples. Acid-pretreatment resulted in the best improvement in dimensional stability compared to the other pretreatments. Increasing the immersion time in NaOH solution was proven to be able to increase dimensional stability both in alkali- and combination-pretreatments, although water absorption values varied.

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Influence of combined heat treatment and densification on mechanical properties of poplar wood

Cited by 12 publications

References 19 publications

Evaluation of heating temperature and time on bending properties of Taurus cedar wood

Evaluation of heating temperature and time on bending properties of Taurus cedar wood

Improvement in Monterey pine of the flame retardancy, thermal conductivity, and mechanical performance through incorporating functional epoxy resin

Effect of Sodium Hydroxide, Succinic Acid and Their Combination on Densified Wood Properties

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