Equilibrium adsorption isotherms obtained at 20, 30, 40, and 50°C for dimethylolethyleneurea (DMEU) on cotton fiber from aqueous solutions are characterized by an initial smooth-rising portion, followed by a sharp decrease and nega tive adsorption of DMEU. Data on conductivity and freezing-point depression of water DMEU solutions indicated that the maximum in the adsorption isotherms stem from the associative property of DMEU molecules. The exothermic affinity, enthalpy, entropy, and limiting coarea for the equilibrium adsorption of DMEU are evaluated. From the negative adsorption, the amounts of nonsolvent water preferentially adsorbed at different temperatures are calculated.
Baddi, N.T. and Sivaraja Iyer, S.R. , Studies on the Aggregation Behavior of Some Direct Dyes in Aqueous Solutions, Kolloid-Z, Z-Polymer210, 132-138 (1966).
2.
Moran, Clifford, M. and Vail, Sydney L., Determination of Free Formaldehyde , Amer. Dyestuff Reptr.54, 185-186 (1965).
3.
Corbett, W.M. , "Methods in Carbohydrate Chemistry," Vol. Iii, Ed. Whistler, R. L., New York, Academic Press, 1965, p. 3.
4.
Fava, A. and Eyring, H., Equilibrium andKinetics of Detergent Adsorption A Generalized Equilibrium Theory , J. Phys. Chem.60, 890-898 (1956).
5.
Findlay, A. and Kitchner, J.A., "Practical Physical Chemistry," 8th ed., London, Longmans Green, 1954, p. 107.
6.
Hine, J., "Physical Organic Chemistry," 2nd ed., New York, McGraw-Hill, 1962, p. 112.
7.
Jeffries, R. , The Sorption of Water by Cellulose and Eight Other Textile Polymers, J. Textile Inst. 51, T339-T374 ( 1960).
8.
Jirgensons, B., "Organic Colloids," Amsterdam, Elsevier, 1958, p. 164.
9.
Peterson, H.A. , Reaction Mechanisms , Structure, and Properties ofMethylol Compounds in Cross-Linking Cotton, Textile Res. J.38, 156-176 (1968).
10.
Peterson, H.A. , Neuere Ergebnisse and Betragchtungen Liber den Reaktions Mechanismus der Aminoplast—Konden— sationen, Textil Rundshau16, 646-656 (1961).
11.
Roff, W.J., The Determination of the Formaldehyde Yield of Cellulose Textiles Treated with Formaldehyde and Melamine Formaldehyde, J. Textile Inst.47, T309-T318 (1956).
12.
Roff, W.J., Study of the Sorption of Formaldehyde from Aqueous Solutions by Cellulose , J. Textile Inst. 50, T353-T372 ( 1959).
13.
Sivaraja Iyer, S.R., Srinivasan, G., and Baddi, N.T., The Influence of Different Electrolytes on the Interaction of Chlorazol Sky Blue FF with the Cotton Fibre Surface in Aqueous Solutions, Textile Res. J.38, 693-700 (1968).
