The influence of chemical degradation and polyethylene glycol on moisture-dependent cell wall properties of archeological wooden objects

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Wagner, L. Almkvist, G. Bader, T. K. Bjurhager, I. Rautkari, L. Gamstedt, E. K. 2017-05-11T07:15:22Z 2017-05-11T07:15:22Z 2016-11-01
dc.identifier.citation Wagner , L , Almkvist , G , Bader , T K , Bjurhager , I , Rautkari , L & Gamstedt , E K 2016 , ' The influence of chemical degradation and polyethylene glycol on moisture-dependent cell wall properties of archeological wooden objects : a case study of the Vasa shipwreck ' Wood Science and Technology , vol 50 , no. 6 , pp. 1103-1123 . DOI: 10.1007/s00226-016-0861-x en
dc.identifier.issn 0043-7719
dc.identifier.issn 1432-5225
dc.identifier.other PURE UUID: 541b3806-763a-4227-9f86-4d9b33b91812
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE LINK:
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dc.description.abstract Cell wall measures allow for direct assessment of wood modification without the adverse effect of varying density and microstructure. In this study, cell wall properties of recent and archeological oak wood from the Vasa shipwreck were investigated for cell wall stiffness, hardness and creep with respect to effects of chemical degradation, impregnation with a preservation agent, namely polyethylene glycol, and moisture. For this purpose, nanoindentation tests were performed at varying relative humidity, leading to different moisture contents in the wood samples. Concurrently, microstructural and chemical characterization of the material was conducted. Impregnated and untreated recent oak wood showed a softening effect of both moisture and preservation agent at the wood cell wall level. On the contrary, increased stiffness was found for non-impregnated Vasa oak, which can be explained by aging-related modifications in cell wall components. These effects were counteracted by the softening effect of polyethyleneglycol in the impregnated Vasa material, where a lower overall stiffness was measured. The reverse effect of the preservation agent and moisture, namely increased indentation creep of the cell wall material, was revealed. The loss of acetyl groups in the hemicelluloses explained the decreased hygroscopicity of the Vasa oak. In the impregnated Vasa oak, this effect seemed to be partly counteracted by the presence of low-molecular polyethylene glycol contributing to higher hygroscopicity of the cell wall. Thus, the higher overall sorptive capacity of the impregnated Vasa material, with respect to the non-impregnated material, was detected, which has resulted in a sorptive behavior similar to that of recent oak wood. The proposed approach requires only small amounts of material, making it especially suitable for application to precious historical wooden artifacts. en
dc.format.extent 21
dc.format.extent 1103-1123
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Wood Science and Technology en
dc.relation.ispartofseries Volume 50, issue 6 en
dc.rights openAccess en
dc.subject.other Forestry en
dc.subject.other Materials Science(all) en
dc.subject.other Plant Science en
dc.subject.other Industrial and Manufacturing Engineering en
dc.subject.other 215 Chemical engineering en
dc.title The influence of chemical degradation and polyethylene glycol on moisture-dependent cell wall properties of archeological wooden objects en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Vienna University of Technology
dc.contributor.department Swedish University of Agricultural Sciences
dc.contributor.department Linnaeus University
dc.contributor.department Uppsala University
dc.contributor.department Department of Forest Products Technology
dc.contributor.department Department of Bioproducts and Biosystems en
dc.subject.keyword Forestry
dc.subject.keyword Materials Science(all)
dc.subject.keyword Plant Science
dc.subject.keyword Industrial and Manufacturing Engineering
dc.subject.keyword 215 Chemical engineering
dc.identifier.urn URN:NBN:fi:aalto-201705113898
dc.identifier.doi 10.1007/s00226-016-0861-x
dc.type.version publishedVersion

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