Interaction of water with the regenerated cellulose membrane studied by DSC |
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Authors: | Krystyna Cie?la H Rahier Gra?yna Zakrzewska-Trznadel |
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Institution: | (1) Institute of Nuclear Chemistry and Technology ul. Dorodna 16, 03-195 Warszawa, Poland;(2) Department of Physical Chemistry and Polymer Science, Vrije Universiteit Brussel, Belgium |
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Abstract: | One to three endothermal peaks atributted to melting of bulk and interfacial water were observed by DSC in the regenerated
cellulose — water system. The profiles of thermal effects depend on water content, time of conditioning, film pretreatment
and the conditions applied during the preceding freezing-thawing cycles. The occurrence might be deduced of melting-crystallisation
processes. A large amount of non-freezable strongly bounded water was also detected.
Although cellulose absorbs water quickly after immersion, the structural changes consisting on ordering of polymer fraction
occur during further conditioning due to increase in strength of water binding. Using the membranes in the separation module
at 90°C causes weakening of these bonds. Differences between interaction of particular cellulose films with water can be detected
during the first, the second and the third heating.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | melting DSC crystallisation bound water bulk water cellulose membrane interfacial water water state |
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