AI Article Synopsis
- The glass transition temperature (T(g)) of human hair is found to be 144 degrees C, lower than wool's 174 degrees C, due to a higher content of hydrophobic proteins acting as internal plasticizers.
- The relationship between water content and glass transition in hair follows the Fox equation, indicating a homogeneous distribution of water within the hair's protein structure.
- Thermal denaturation of hair showed no change in water content or T(g), reinforcing the idea of water being evenly distributed within alpha-keratins.
Article Abstract
The glass transition of human hair and its dependence on water content were determined by means of differential scanning calorimetry (DSC). The relationship between the data is suitably described by the Fox equation, yielding for human hair a glass transition temperature of T(g) = 144 degrees C, which is substantially lower than that for wool (174 degrees C). This effect is attributed to a higher fraction of hydrophobic proteins in the matrix of human hair, which acts as an internal plasticizer. The applicability of the Fox equation for hair as well as for wool implies that water is homogeneously distributed in alpha-keratins, despite their complex morphological, semicrystalline structure. To investigate this aspect, hair was rendered amorphous by thermal denaturation. For the amorphous hair neither the water content nor T(g) were changed compared to the native state. These results provide strong support for the theory of a quasi-homogeneous distribution of water within alpha-keratins.
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| http://dx.doi.org/10.1002/bip.20429 | DOI Listing |
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