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Research article - Peer-reviewed, 2021

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

Sivrikaya, Huseyin; Hosseinpourpia, Reza; Ahmed, Sheikh Ali; Adamopoulos, Stergios


Scots pine sapwood was pretreated with two levels of propanetriol (20% and 40% w/w glycerol), and then subjected to vacuum-heat treatment (VHT) at 180 degrees C and 200 degrees C. The treated samples were examined with respect to their weight and volumetric changes, mechanical properties, colour changes, and dynamic water vapour sorption. The weight of the samples after VHT did not change with increasing the temperature, but it was increased in glycerol pretreated samples. Combination of glycerol pretreatment and VHT decreased the maximum swelling. Total colour change was significantly higher during VHT at a higher temperature, while no obvious trend observed in the samples pretreated with glycerol. Modulus of elasticity (MOE) and modulus of rupture (MOR) were not affected by solely VHT, but strongly decreased after glycerol pretreatment. The equilibrium moisture content (EMC) of the samples decreased by VHT. The glycerol pretreatment caused a reduction in EMC values at a relative humidity (RH) below 60%, but considerably increased the moisture sorption in the RH above 75%. VHT slightly reduced the sorption hysteresis compared to untreated wood, but an apparent reduction in hysteresis observed by glycerol pretreatment. This indicates that the flexibility of the wood cell wall polymers increases due to glycerol pretreatment, which results in decreased MOE and sorption hysteresis values.


Bulking; colour change; dynamic vapour sorption; glycerol; vacuum-heat treatment

Published in

Wood Material Science and Engineering
2021, volume: 17, number: 5, pages: 328-336

Authors' information

Sivrikaya, Huseyin
Bartin University
Hosseinpourpia, Reza
Linnaeus University
Ahmed, Sheikh Ali
Linnaeus University
Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology

Sustainable Development Goals

SDG12 Responsible consumption and production

UKÄ Subject classification

Wood Science
Other Materials Engineering

Publication Identifiers


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