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Molecular origin of mechano-sorptive creep in cellulosic fibres
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0002-1341-0266
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.ORCID iD: 0000-0003-3534-1107
2020 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 230, article id 115615Article in journal (Refereed) Published
Abstract [en]

Mechano-sorptive creep, i.e. the increased rate of creep that occurs during changing relative humidity, when loading paper or wood, is a phenomenon still not fully understood. This phenomenon was here investigated by examining the changes occurring at the molecular level utilising FTIR spectroscopy. By subjecting the paper to deuterated water, the changes involving both the crystalline hydroxyls as well as those in accessible regions could be examined. During loading, the cellulose molecular chains are stretched taking the load. In addition, during mechano-sorptive creep a further exchange from OH to OD groups occurred. This was interpreted as caused by slippage between cellulose fibrils allowing previously non-accessible hydroxyls to become available for deuterium exchange. Thus, the loosening of the structure, during the changing moisture conditions, is interpreted as what has led to the increased creep and the possibility for new areas of cellulose fibril/fibril aggregates to be exposed to the deuterium exchange.

Place, publisher, year, edition, pages
Elsevier Ltd , 2020. Vol. 230, article id 115615
Keywords [en]
Cellulose, Creep, Deuterium, Moisture changes, Paper, Relative humidity, Tensile load, Atmospheric humidity, Fourier transform infrared spectroscopy, Moisture, Cellulose fibrils, Deuterium exchange, FTIR spectroscopy, Mechanosorptive creep, Moisture conditions, Molecular levels, Molecular origins, Tensile loads, Exchange, Fibrils, Loading
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-43394DOI: 10.1016/j.carbpol.2019.115615Scopus ID: 2-s2.0-85076845304OAI: oai:DiVA.org:ri-43394DiVA, id: diva2:1390366
Note

Funding details: Swedish Insitute, SI; Funding text 1: This work has been performed within the pre-competitive part of the RISE Bioeconomy Research Programme 2018–2020. The funding of the participating parties, ABInBev , BillerudKorsnäs , Georgia-Pacific , Metsä Board , MillerGraphics , MondiPowerflute and StoraEnso , are gratefully acknowledged as well as the co-financing from funds for strategic competence development to RISE from the Swedish state .

Available from: 2020-01-31 Created: 2020-01-31 Last updated: 2020-01-31Bibliographically approved

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Stevanic Srndovic, JasnaSalmen, Lennart

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