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The structure of adsorbed water in cellulose acetate membranes

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Abstract

The structure of water adsorbed in cellulose acetate membranes is determined by the fundamental and overtone IR spectra. Water is weakly H-bonded to ester and ether groups of the membrane, at low water contents. With increasing water content, more and more liquid-like water is observed. In addition, a small amount of a third type of water is present. The amounts of these three species are estimated from the spectra. At high water contents, the amount of liquid-like water increases strongly. The H-bond cooperativity of such water may be the cause for this increase and for the common anomalous water adsorption isotherms.

The H-bond energy of the first hydration shell is relatively small, contrary to the anomalous large adsorption heats ΔH ad. This could be described by larger van der Waals interactions between this type of water and the membrane groups as a result of a higher coordination number compared with Z=4.4 of liquid-like water. This model is in agreement with the decrease of ΔH ad with increasing water sorption reaching the evaporization enthalpy of pure water at high water contents.

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Author notes

  1. K. Rangsriwatananon

    Present address: Institute of Science, Suranaree University of Technology, Nakhoratchasima, Thailand

Authors and Affiliations

  1. Fachbereich Physikalische Chemie, Universität Marburg, Hans Meerweinstraße, 35032, Marburg, Germany

    W. A. P. Luck & K. Rangsriwatananon

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  1. W. A. P. Luck
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Luck, W.A.P., Rangsriwatananon, K. The structure of adsorbed water in cellulose acetate membranes. Colloid Polym Sci 275, 1018–1026 (1997). https://doi.org/10.1007/s003960050180

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