Cellulose Dissolved in Ionic Liquids for Modification of the Shape of Keratin Fibers

The methylimidazolium chloride ionic liquid (IL) was successfully used for the dissolution of cotton cellulose. IL and IL-cellulose were investigated by X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectroscopy analyses. The obtained IL-cellulose was applied to wool and hair keratin fiber surfaces, forming a fine coating layer. From FT-IR and XRD analyses, the results suggested the reduction of hydrogen bonds and crystallinity in IL-cellulose-coated wool fibers. This effect was caused by covering the wool with the IL-cellulose coating, and good intrinsic mechanical properties were observed. Moreover, the dimensional performance of coated keratin fibers presented length variations of around 8 and 12% under wet and dry conditions for wool and hair fibers, respectively. Coated keratin fibers could be of great value for a cleaner process in the cosmetic area associated with their ability to stretch and curl when triggered by humidity.

Automated summary

The research successfully utilized IL to dissolve cotton cellulose and apply it to wool and hair keratin fiber surfaces, forming a coating layer. This IL-cellulose coating reduced hydrogen bonds and crystallinity in wool fibers, while maintaining good mechanical properties. Coated keratin fibers showed length variations of around 8% and 12% under wet and dry conditions, respectively, and could be valuable for cleaner processes in the cosmetic industry.