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On the origin of sorption hysteresis in cellulosic materials
RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.ORCID iD: 0000-0003-3534-1107
KTH Royal Institute of Technology, Sweden.
2018 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 182, p. 15-20Article in journal (Refereed) Published
Abstract [en]

Moisture sorption and moisture sorption hysteresis of carbohydrates are phenomena which affect the utilisation of products made thereof. Although extensively studied, there is still no consensus regarding the mechanisms behind sorption hysteresis. Attempts have been made to link the behaviour to molecular properties, in particular to softening properties, and the moisture sorption hysteresis has therefore here been investigated by modifying cellulosic fibres to affect their softening properties. The results show that the moisture sorption hysteresis diminishes with decreasing softening temperature, and was even completely absent at the higher degrees of modification. The moisture sorption characteristics also changed from a type II sorption to a more type III sorption behaviour, a feature more prominent the higher the degree of modification and the higher the temperature. For the highest degree of modification studied the sorption characteristics changed from sorbing less water the higher the temperature to sorbing more water with increasing temperature.

Place, publisher, year, edition, pages
2018. Vol. 182, p. 15-20
Keywords [en]
cellulose, chemical modification, glass transition temperature, dialcohol cellulose, kraft pulp, moisture sorption, sorption hysteresis, temperature
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-32794DOI: 10.1016/j.carbpol.2017.11.005Scopus ID: 2-s2.0-85032968676OAI: oai:DiVA.org:ri-32794DiVA, id: diva2:1161183
Available from: 2017-11-29 Created: 2017-11-29 Last updated: 2018-08-07Bibliographically approved

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Salmen, Lennart

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