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.
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Cieśla, K., Rahier, H. & Zakrzewska-Trznadel, G. Interaction of water with the regenerated cellulose membrane studied by DSC. Journal of Thermal Analysis and Calorimetry 77, 279–293 (2004). https://doi.org/10.1023/B:JTAN.0000033213.31447.1d
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DOI: https://doi.org/10.1023/B:JTAN.0000033213.31447.1d