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Water sorption in microfibrillated cellulose (MFC): The effect of temperature and pretreatment
Università degli studi di Bologna, Italy.
Università degli studi di Bologna, Italy.
Università degli studi di Bologna, Italy.
RISE - Research Institutes of Sweden, Bioeconomy.ORCID iD: 0000-0001-7979-9158
2017 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 174, p. 1201-1212Article in journal (Refereed) Published
Abstract [en]

Water sorption behavior of two different microfibrillated cellulose (MFC) films, produced by delamination of cellulose pulp after different pretreatment methods, is examined at various temperatures (16–65 °C) and up to 70% RH. The effect of drying temperature of MFC films on the water uptake is also investigated. The obtained solubility isotherms showed the typical downward curvature at moderate RH, while no upturn is observed at higher RH; the uptakes are in line with characteristic values for cellulose fibers. Enzymatically pretreated MFC dispersion showed lower solubility than carboxymethylated MFC, likely due to the different material structure, which results from the different preparation methods The experimental results are analyzed by Park and GAB models, which proved suitable to describe the observed behaviors. Interestingly, while no significant thermal effect is detected on water solubility above 35 °C, the uptake at 16 and 25 °C, at a given RH, is substantially lower than that at higher temperature, indicating that, in such range, sorption process is endothermic. Such unusual behavior for a cellulose-based system seems to be related mainly to the structural characteristics of MFC films, and to relaxation phenomena taking place upon water sorption. The diffusion kinetics, indeed, showed a clear Fickian behavior at low temperature and RH, whereas a secondary process seems to occur at high temperature and higher RH, leading to anomalous diffusion behaviors.

Place, publisher, year, edition, pages
2017. Vol. 174, p. 1201-1212
Keywords [en]
nanocellulose, solubility isotherm, sorption modeling, water sorption
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-30335DOI: 10.1016/j.carbpol.2017.07.023Scopus ID: 2-s2.0-85026733135OAI: oai:DiVA.org:ri-30335DiVA, id: diva2:1134265
Available from: 2017-08-18 Created: 2017-08-18 Last updated: 2018-08-22Bibliographically approved

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