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© 1981 Society of Cosmetic Chemists
Journal of the Society of Cosmetic Chemists, Vol. 32, No. 1, 27-36


A hysteresis in heat dried hair
R. Crawford , C. R. Robbins , J. Curran , K. Chesney

ABSTRACT

Synopsis

Hair dried with heat and equilibrated at room temperature at a moderate relative humidity will have a lower moisture content than room temperature dried hair. After heat drying, hair absorbs moisture but does not return to the room temperature dried water level until it is rewet or conditioned at a higher relative humidity and dried at room temperature, i.e. a hysteresis exists in heat drying analogous to that from chemical desiccation of hair. Heat drying also makes hair more susceptible to static charge buildup, which is related to the hysteresis, and results in increased flyaway during combing or brushing. Heat drying can also produce a short term decrease in fiber stiffness which is not related to this hysteresis but appears to be due to the direct action of heat on the fibers.

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© 1981 Society of Cosmetic Chemists
Journal of the Society of Cosmetic Chemists