Dyeing Properties of Dichroic Organic Dye on Poly(vinyl alcohol) Film with a High Degree of Hydrolysis 


Vol. 50,  No. 5, pp. 328-336, Oct.  2013
10.12772/TSE.2013.50.328


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  Abstract

Dyeing of a poly(vinyl alcohol) (PVA) film with a high degree hydrolysis (>98%) using Direct Black 22, a dichroic organic dye, was investigated under various conditions (dye concentration, salt (Na2SO4) concentration, and temperature). This process could correctly be analyzed using the Freundlich isotherm (Cfilm=KFCsoln 1/n) based on the pore model. The Freundlich exponent 1/n appeared to be constant over a broad range of salt concentrations, but the Freundlich constant KF assumed the maximum value for [Na2SO4]=~0.010 M. However, this value was 10 times greater than that under the no-salt conditions. Analysis of the adsorption kinetics revealed that only the early stage of dyeing was followed second-order, with an activation energy of 50.2 kJ/mol. However, gradual deviation from the second-order occurred with an increase in the dyeing time. These results indicated that the surfaces of the inner pores in the PVA film are dyed through multilayer adsorption, which is accompanied by complicated kinetics.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

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