It is the purpose of this paper to discuss the sorption of surface-active agents and water formulated in the hair conditioner on to human hair through the use of the radioactive tracers. As the results, it was found that three components in the hair conditioner employed for the study sorbed on to human hair.
1). The sorption of Lauryldiethanolamide (Lauryl-Amide) reached to the saturated point 4 or 5 hours after treatment. The percentage of Lauryl-Amide sorbed on to the samples were found to be 0.5 and 0.4 of the hair weight 5 hours treatment respectively.
2). The sorption of Phosphoric Acid Ester of Tetraethoxy Lauryl Ether reached to the saturated point 12 hours after treatment and their percentage were found to be 0.7 and 0.4 of the hair weight respectively.
3). The amount of penetrated water to the hair samples was also increased with the time after treating the hair conditioner and reached maximum after 2 hours. The maximum percentage of water penetrated into hair were found to be 1.3 and 1.2.
The sorption of these compounds formulated in the hair conditioner on to the hair will be discussed, however, further study would be required to find whether it was the adsorption or absorption of surface-active agents on to the hair. The study to determine the mechanism of the sorption on to human hair will be carried out with the radioautography.
