The toughening transition in hair keratin
August 1993
in “
Colloid & Polymer Science
”
TLDR The observed "toughening" in keratin was actually due to water evaporation, not a real change in keratin.
The document discussed a study by Milczarek et al. that reported a "toughening" transition in keratin observed through differential scanning calorimetry (DSC). However, it was concluded that this observation was a misinterpretation, as the supposed transition was actually due to the evaporation peak of residual water in keratin fibers after mild drying.