Effect of pressurized hot water extraction and esterification on the moisture properties and decay resistance of Scots pine (Pinus sylvestris L.) sapwood

Pressurized hot water extraction (HWE) treatment has the benefit of simultaneous extraction of hemicellulose-based carbohydrates and modification of the solid phase, but it does not drastically improve wood durability. However, removing hemicelluloses from the wood by HWE treatment creates water-fil...

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Published inHolzforschung Vol. 76; no. 10; pp. 916 - 928
Main Authors Kyyrö, Suvi, Altgen, Michael, Belt, Tiina, Seppäläinen, Hanna, Brischke, Christian, Heinze, Petra, Militz, Holger, Rautkari, Lauri
Format Journal Article
LanguageEnglish
Published Berlin De Gruyter 26.10.2022
Walter de Gruyter GmbH
Subjects
Acid resistance
biological durability
Brittleness
Carbohydrates
Cell walls
Chemical composition
Citric acid
Decay
Desiccants
Diffusion
Drying
Durability
Esterification
Hemicellulose
Hot water
hygroscopicity
Moisture effects
Moisture resistance
Pine
Pine trees
Pinus sylvestris
Solid phases
starch
Wood
wood modification
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Summary:Pressurized hot water extraction (HWE) treatment has the benefit of simultaneous extraction of hemicellulose-based carbohydrates and modification of the solid phase, but it does not drastically improve wood durability. However, removing hemicelluloses from the wood by HWE treatment creates water-filled spaces in the cell walls which could be filled with modification agent in order to improve the properties of the wood. Without drying, modification agent can be added into the saturated wood via diffusion. The esterification of wood with citric acid (CA) improves resistance to biological deterioration but increases brittleness. However, combining CA esterification with additional chemicals that form links with CA can mitigate brittleness. This study investigated esterification as a method for modifying HWE treated wood. HWE treatment with CA solution (4% w/v) was applied at 120 °C for 3 h to Scots pine ( L.) sapwood specimens. The specimens were further modified by diffusion with CA and starch derivatives followed by curing. The applied method changed the moisture properties and chemical composition of the wood. The results showed successful wood bulking. The investigated method slightly improved decay resistance to and but did not change resistance to
ISSN:0018-3830
1437-434X
DOI:10.1515/hf-2022-0100