DAMEGE OF HAIR FIBERS AS EVALUATED BY AN ELECTRICAL CAPACITANCE TECHNIQUE

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An attempt has been made to evaluate the damage of hair fibers using an electrical capacitance technique, and the results were compared with those obtained by using the Wilhelmy principle. To this end, two types of hair fiber samples were prepared. In one type, hair fibers were oxidized with dichloroisocyanuric acid (DCCA), and in the other, the fibers were physically rubbed with sandpaper. Water transport along the hair fiber bundle was examined with an apparatus using an electrical capacitance technique. The rate of water transport increased with the degree of damage. These results were consistent with the results on the contact angle measurements carried out with a Wilhelmy type apparatus for recording the wetting force of single hair fiber in water. Therefore, we found that an electrical capacitance technique is potentially useful as a convenient evaluation of the damage to hair fibers.