Theory and Its Practical Application for Permanent Hair Straightening.
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概要
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A method for permanent hair straightening was studied by applying a heat iron technique to the hairs reduced with a solution containing thioglycolic acid (TGA) and dithiodiglycolic acid (DTDG) before oxidation treatment. The effectiveness of straightening was evaluated as a function of the degree of supercontraction observed on the treatment hairs, which was greatly dependent on pH and the concentrations of TGA and DTDG in reducing system. On the experimental and practical bases, a range of around 5 to 8% supercontraction was found to be necessary to achieve successful permanent hair straightening. High pressure differential scanning calorimetry was used to estimate the α-helix content. From the relationship between the melting enthalpy and the degree of supercontraction of the hair, an important suggestion was made that the supercontraction within 10% is caused by the randomization of the α-helix, and permanency related to the hair straightening is a result of the transformation of α-crystal phase into amorphous phase.
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