STRUCTURAL ANALYSIS OF PERMANENT WAVED HAIR BY SAXS 125 was different in our differently treated hair samples, a scattering intensity profi le was extracted from the 2-D profi le. Figure 3 shows typical scattering intensity profi les for four different hair samples. The bleached hairs displayed the highest scattering intensity, followed by the permed hairs, and fi nally the permed hairs with curl fallout. The IF organization in the various hair samples was analyzed in detail. The distance be- tween IFs and the FWHM of the scattering intensity profi le peak were found to be larger in the permed hairs compared with the bleached hairs (control sample) as is shown in Figure 4. Therefore, we could conclude that the IF orientation of the permed hairs was anisotropic. In addition, it was found that the distance between IFs on the convex side of the hair curvature was different from that on its concave side, and the IFs on the convex side were aligned anisotropically, whereas those on the concave side were aligned isotropically. Figure 2. Typical 2-D profi l e measured using SAXS (bleached hair).

JOURNAL OF COSMETIC SCIENCE 126 On the other hand, the distance between IFs and the FWHM in the bleached hair were observed in the symmetry with the center of hair shaft as an axis, as expected. Figure 5 shows the results of the analysis for the permed hair and the stretched hair. Al- though distance between IFs in the stretched hairs had no difference with that in the permed hairs, the FWHM in the stretched hair was smaller than that in the permed hair. Figure 6 shows the results of the SLS-immersed hair compared with the permed hair. The distance between IFs and the FWHM in the SLS-immersed hairs was smaller than those in the permed hairs. Figure 7 shows the results of the stretched SLS-immersed hair compared with the permed hair. Although distance between IFs in the stretched SLS immersed hairs had no differ- ence compared with that in the permed hairs, the FWHM in the stretched SLS immersed hair was smaller than that in the permed hair. Thus, the IF orientation was isotropic for Figure 3. Change of scatterin g intensity profi le extracted from the equatorial axis.