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A molecular model for reversible and irreversible hygroscopicity changes by thermal wood modification

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Willems, Wim
dc.contributor.author Altgen, Michael
dc.contributor.author Rautkari, Lauri
dc.date.accessioned 2021-01-25T10:13:08Z
dc.date.available 2021-01-25T10:13:08Z
dc.date.issued 2020-04-01
dc.identifier.citation Willems , W , Altgen , M & Rautkari , L 2020 , ' A molecular model for reversible and irreversible hygroscopicity changes by thermal wood modification ' , Holzforschung , vol. 74 , no. 4 , pp. 420-425 . https://doi.org/10.1515/hf-2019-0057 en
dc.identifier.issn 0018-3830
dc.identifier.issn 1437-434X
dc.identifier.other PURE UUID: 68bd0783-8e1c-450f-91b8-3d5fb6f69a90
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/68bd0783-8e1c-450f-91b8-3d5fb6f69a90
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/55007180/_1437434X_Holzforschung_A_molecular_model_for_reversible_and_irreversible_hygroscopicity_changes_by_thermal_wood_modification.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/102173
dc.description HUOM! Tähän pitää lisätä lopullinen versio kun se julkaistu. Tämä kustantajan lehdissä saa lopullisen aukaista 12 kuukautta virallisesta julkaisemisesta.
dc.description.abstract Heat treatment (HT) is a well-known means to reduce the equilibrium wood moisture content (EMC) at a specified relative humidity (RH). EMC is profoundly decreased by the loss of accessible hydroxyl groups (OHacc) in the wood matrix by thermochemical reactions. However, the obtained EMC reduction after HT can be partly reversible, depending on the ability of the wood matrix polymers to fully mechanically relax during HT. We discuss the results of our earlier experimental study on the OHacc content and the associated EMC decrease at 93% RH by a relaxation inhibiting dry-HT vs. a relaxation enabling wet-HT. New experimental results, showing that OHacc does not significantly change during reversible EMC changes, are added to the discussion. This study quantitatively supports a molecular explanation of the reversible EMC, in which wood moisture is principally bound at sorption sites, composed of two functional groups, constituting a hydrogen-donor/acceptor pair, involving at least one OHacc group. The irreversiblepart of EMC reduction is assigned to the thermochemical removal of OHacc from the wood matrix. The reversible part is attributed to a process of wood polymer conformal rearrangements, bringing an isolated OHacc group in proximity of another free hydrogen-bonding functional group, creating a site for water sorption. en
dc.format.extent 6
dc.format.extent 420-425
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Walter De Gruyter
dc.relation.ispartofseries Holzforschung en
dc.relation.ispartofseries Volume 74, issue 4 en
dc.rights openAccess en
dc.title A molecular model for reversible and irreversible hygroscopicity changes by thermal wood modification en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department FirmoLin Technologies BV
dc.contributor.department Wood Material Science
dc.contributor.department Department of Bioproducts and Biosystems en
dc.subject.keyword crosslinks
dc.subject.keyword equilibrium moisture content
dc.subject.keyword heat treatment
dc.subject.keyword mechanical relaxation
dc.subject.keyword sorption sites
dc.identifier.urn URN:NBN:fi:aalto-202101251483
dc.identifier.doi 10.1515/hf-2019-0057
dc.type.version publishedVersion
dc.date.embargo info:eu-repo/date/embargoEnd/2020-08-14

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