Abstract
An attempt has been made to study the adsorption of cationic polymer onto the surface of human hair from aqueous solutions in the presence of low molecular weight surfactants of different ionic character. Adsorption of polymer-surfactant complexes has been studied qualitatively by measuring the water wettability of the fiber after treatment using a modified Wilhelmy technique. Changes in water wettability in the same region of the treated fiber in multiple immersions can provide useful information regarding the ease of desorption of the complex in water. From the water wettability of the treated fiber and the desorption characteristics of polymer-surfactant complexes of different composition, an attempt has been made to explain indirectly the nature of the interactions between a cationic polymer and low molecular weight surfactants of different ionic character. Results indicate that anionic and amphoteric surfactants interact strongly with the cationic polymer. As expected, cationic surfactants do not seem to interact with the polymer, but they compete with the polymer for adsorption sites on the fiber surface.
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