Abstract
The effects of the chemical and mechanical waving treatment conditions on the permanent waving performance of hair tresses waved by a standard waving procedure simulating commercial practice were investigated. The evaluation of the shape of the waved samples was performed in dry state after one day. Comparing the wave performance of 5 minutes reduced hair tress in the ammonium thioglycolate solution with the different concentrations, the number of curl tops increased with increasing the concentration of the thiolate anion, which is the active reducing form on waving. This suggests that the formation of curl is dependent on the protein chain rearrangement of the areas in hair fiber on which RS- initially acts. The higher the initial stress of hair was induced by wrapping on the rod, the greater the protein chains in the reduced area rearranged, which has results in the waved hair with the large number of curls. It was found, in addition, that the protein chain structure change occurred during the neutralizing process may affect the waving performance.
