Failure of intercellular adhesion in hair fibers with regard to hair condition and strain conditions

The document presents an abstract from a study that investigated the failure of intercellular adhesion in hair fibers under various conditions. The study proposed a model of the cell membrane complex (CMC) based on prior research, which included interconnecting bonds between layers to help understand hair-fracturing mechanisms. The researchers found that adhesion failure often occurs in the CMC and is influenced by the hair's condition and whether it is wet or dry. In the wet state, failure involves hydrophilic layers such as the contact zone of the CMC or the endocuticle, while in the dry state, it generally involves bonding between hydrophobic layers. Chemical damage from perms, bleaches, and sunlight was found to break specific bonds, leading to more complex fracture patterns in the hair fibers. The study did not provide the number of hair fibers or participants involved in the research.