Vacuum-heat treatment of Scots pine (<i>Pinus sylvestris</i>L.) wood pretreated with propanetriol

Sivrikaya, Hüseyin; Hosseinpourpia, Reza; Ahmed, Sheikh Ali; Αδαμόπουλος, Στέργιος

doi:10.1080/17480272.2020.1861085

Cited by 10 publications

(4 citation statements)

References 60 publications

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“…However, the same situation was not realized for poplar in the case of vacuum heat treatment at 200 °C for 2h which gave the lowest result. In a previous study, we found that MOE and MOR were not affected by solely vacuum heat treatment at the temperatures of 180 and 200 °C for 2h in Scots pine (Sivrikaya et al 2020). Norway spruce and fir, thermally modified by TERMOVUOTO process in the range of 160 to 220 °C under vacuum conditions showed no significant decrease in mechanical properties.…”

Section: Mechanical Propertiesmentioning

confidence: 78%

Physical and Mechanical Properties of Fir and Poplar Subjected to Tall Oil and Vacuum Heat Treatment

Gökmen

Sivrikaya

2021

Bartın Orman Fakültesi Dergisi

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Vacuum heat treatment creates an oxygen-free environment, thus positively effects the properties of wood compared to traditional heat treatment. Crude tall oil is a non-biocidal wood preservative, composed of resin and fatty acids and improves some properties of wood such as water uptake and decay resistance. In this study, tall oil dissolved in ethanol (10% and 20%) for impregnation of the fir and poplar samples according to full cell method, followed by subjected to vacuum-heat treatment at 180 ºC and 200 ºC for 1 and 2 h respectively. Water uptake and mechanical tests such as bending and compression strength of untreated and treated samples were investigated. Results showed that weight percent gain (WPG) was about two times higher for tall oil treatment at 20% than 10% of tall oil. Vacuum heat treatment showed similar trend with control samples in terms of water uptake, while combined treatment of tall oil and vacuum heating lowered the water uptake. The results of mechanical tests indicated that bending strength was not affected by tall oil treatment. Combination of tall oil and vacuum heat treatment improved the compression strength.

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Section: Mechanical Propertiesmentioning

confidence: 78%

Physical and Mechanical Properties of Fir and Poplar Subjected to Tall Oil and Vacuum Heat Treatment

Gökmen

Sivrikaya

2021

Bartın Orman Fakültesi Dergisi

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“…The reduction in hygroscopicity after heat treatment is probably due to the reduction of the hydrophilic groups in present study. Sivrikaya et al (2020) stated that the EMC values of Scotch pine specimens decreased significantly after heat treatment. Additionally, similar results were reported by Kamperidou et al (2014).…”

Section: Resultsmentioning

confidence: 99%

Physical and mechanical properties of laminated wood made from heat-treated Scotch pine reinforced with carbon fiber

Perçin

Uzun

2023

BioRes

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Laminated veneer lumber (LVL) and reinforced laminated veneer lumber (RLVL) with carbon fiber were produced from heat-treated Scotch pine (Pinus sylvestris L.) wood using phenol formaldehyde (PF), polyvinyl acetate (PVAc), and polyurethane (PU) resins. Wood veneers were subjected to heat treatments at 150 °C, 170 °C, or 190 °C for 2 h before lamination. The effects of the reinforcement, heat treatment temperatures, and resins on the properties of the LVL and RLVL were analyzed. Density, equilibrium moisture content (EMC), modulus of rupture (MOR), and modulus of elasticity (MOE) were evaluated. The results showed that MOR and MOE values of solid wood and LVL specimens decreased with increasing treatment temperature. However, reinforcement with carbon fiber increased both MOR and MOE. In addition, the density values of the all RLVL specimens improved, and the EMC altered significantly for all test specimens. Compared to solid samples, the highest MOR values increased by approximately 21% in PF-RLVL samples. Similarly, the highest MOE values increased by 31% in PF-RLVL samples. In conclusion, carbon fiber, one of the most used fabric types in composites, could be utilized in the manufacture of reinforced LVL with heat-treated veneers.

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“…The vacuum environment can effectively prevent the wood from burning during the TM process. Sivrikaya et al impregnated wood under vacuum condition (0.08 MPa) for 1 h with dissolved glycerin before vacuum TM [25]. The advantage of vacuum impregnation to wood is that the intervention of glycerin promotes the degradation of cell wall materials, and the TM can be carried out at a lower temperature.…”

Section: Vacuum Thermal Modification After Glycerin Pretreatmentmentioning

confidence: 99%

“…Glycerol et al also provide additional hydroxyl groups in the cell wall, forming a three-dimensional network and stabilizing the wood cell wall polymers [26]. This TM enhances the bending properties of wood and significantly improves the flexibility of wood cell walls [25].…”

Section: Vacuum Thermal Modification After Glycerin Pretreatmentmentioning

confidence: 99%

Research Progress of Wood Cell Wall Modification and Functional Improvement: A Review

Zhou

Liu

2022

Materials

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The modification of wood cell walls is based on the characteristics of the chemical composition and structure of the cell wall. Various physical and chemical modifications to these characteristics enhance the original properties of the cell wall and give additional functionality. Through complex modification, wood has also obtained the opportunity to become a multifunctional material. Scholars have paid more attention to the microscopic properties of the cell wall with continuous enrichment of modification methods and improvement of modification mechanisms. This article summarizes the methods of cell wall modification in recent years and proposes prospects for future development: (1) innovation of modifiers and combination with modification mechanism, as well as improvement of cell wall permeability; (2) the application directions of cell wall structures; and (3) the application of nano-technologies in cell wall modification. This review provides further ideas and technologies for wood modifications.

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Vacuum-heat treatment of Scots pine (Pinus sylvestrisL.) wood pretreated with propanetriol

Cited by 10 publications

References 60 publications

Physical and Mechanical Properties of Fir and Poplar Subjected to Tall Oil and Vacuum Heat Treatment

Physical and Mechanical Properties of Fir and Poplar Subjected to Tall Oil and Vacuum Heat Treatment

Physical and mechanical properties of laminated wood made from heat-treated Scotch pine reinforced with carbon fiber

Research Progress of Wood Cell Wall Modification and Functional Improvement: A Review

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