Changes in the hygroscopic behavior of cellulose due to variations in relative humidity

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http://hdl.handle.net/10138/258246

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Lovikka , V A , Rautkari , L & Maloney , T C 2018 , ' Changes in the hygroscopic behavior of cellulose due to variations in relative humidity ' , Cellulose , vol. 25 , no. 1 , pp. 87-104 . https://doi.org/10.1007/s10570-017-1570-9

Title: Changes in the hygroscopic behavior of cellulose due to variations in relative humidity
Author: Lovikka, Ville A.; Rautkari, Lauri; Maloney, Thaddeus C.
Contributor organization: Department of Chemistry
Date: 2018-01
Language: eng
Number of pages: 18
Belongs to series: Cellulose
ISSN: 0969-0239
DOI: https://doi.org/10.1007/s10570-017-1570-9
URI: http://hdl.handle.net/10138/258246
Abstract: Details on how cellulosic surfaces change under changing moisture are incomplete and even existing results are occasionally neglected. Unlike sometimes reported, water adsorption is unsuitable for surface area measurements. However, water can be utilized for assessing surface dynamics. Hygroscopic changes of pulp and bacterial cellulose were studied by dehydrating the samples in a low polarity solvent and then introducing them into a moist atmosphere in a dynamic vapor sorption (DVS) apparatus at 0-93% relative humidity (RH). The DVS treatment caused hygroscopicity loss near applied RH maxima, however, the hygroscopicity increased at RH values > 10-20% units lower. Additionally, the hygroscopic changes were partially reversible near the RH maximum. Therefore the hygroscopicity of cellulose could be controlled by tailoring the exposure history of the sample. Hornification reduced these changes. The observations support reported molecular simulations where cellulose was shown to restructure its surface depending on the polarity of its environment.
Subject: Cellulose
Water adsorption
Solvent exchange
Hornification
Surface restructuring
Critical point drying
WATER-VAPOR SORPTION
WOOD PULP FIBERS
CELL-WALL
MICROCRYSTALLINE CELLULOSE
CRYSTALLINE CELLULOSE
AMORPHOUS CELLULOSE
DEUTERIUM-EXCHANGE
MOISTURE SORPTION
NATURAL FIBERS
SURFACE-AREA
116 Chemical sciences
Peer reviewed: Yes
Usage restriction: closedAccess


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