Water Binding On/In Hair.

Impact of Water Structure and Water Binding On/In Hair

 

So critical is the moisture content to the end properties, it has been suggested that water should be considered part of the complex structure of hair. However, this moisture content is not constant, but varies in a predictable manner with the relative humidity of the surrounding atmosphere – and accordingly, so do the properties of hair. These differing properties are behind the heat styling process, where the application of heat removes water and creates sufficient additional internal bonding to anchor a new conformation. This said the freshly-styled hair immediately begins to re-adsorb moisture from the atmosphere with progressive style reversion. The ability to significantly prolong water-set hair styles would be a significant benefit for the industry. An improved knowledge of moisture adsorption and desorption rates is central to this goal – while also building our general awareness of materials penetrating into hair. On-going work involves understanding the effects of various conditions and experimental parameters on adsorption rates – which improves confidence in conclusions arising from various treatments.

Adsorption Isotherm for Water and Hair - Virgin Hair

An ability to alter hair’s water content leads to previously unobtainable changes in fiber
properties.

Youngs Modulus as a Function of RH

The mechanical properties of hair are dependent on the water content and therefore vary
concomitantly with climatic conditions.

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