Caracterização da integridade estrutural da fibra capilar tratada com diferentes produtos químicos

Abstract

The hair treatments have the purpose to protect and to treat the threads of extern aggressions and chemical processes. Nevertheless, due to the growing technological advancement, it is necessary to know on the choice of the ideal treatment for the type of existent damage. This work aims to analyze the products available in the market of hair nutrition applied in countless chemical processes, which are justified by the difficulty of finding scientific information on the protocols of treatment. Samples of pure hairs were analyzed and with processes of smoothing, dye, and discoloration before and after changes provoked by different treatments of hair nutrition. Besides checking the efficiency of the treatments after structural damages caused by these chemical processes separately. For the hair characterization there were used techniques of X-rays diffraction (XDR), spectroscopy of absorption in the infrared (FTIR), spectroscopy Raman. For morphological analysis, it used scanning electron microscopy (SEM) and atomic force microscopy (AFM). In the thermal analysis there were used the techniques of thermogravimetric (TG) and the differential exploratory calorimetry (DSC). Through these techniques it was noticed the predominant difference between the pure hair and with chemical treatment. After the treatments, it was noticed through the FTIR that several important connections were modified, like the connections S-S, SO3, C-H, C=O as well as the secondary structures of proteins that suffered alterations in his resignations. The results demonstrate that the chemical processes modified the structure conformational of the keratin and that you gave the sum the hair structure is damaging to the fiber, chemically and physically modifying the capillary structure. In spite of such products were destined changing positively the structure and the appearance of the hair, they finish consequently, producing certain undesirable damages. In the thermal analysis mass loss was noted in all the chemical processes and treatments, and the samples have also presented glass transition (Tg). It is inferred that the results, in general, confirmed that the treatment in which one stood out in the fulfilled analyses was the product to the base of coconut oil and glycerol, of the professional treatment, more specifically in the process of the bigger degradation of the fiber that was the hair which passed by discoloration followed dye. That demonstrated that this treatment caused a standard of different morphological deformation in the hair surface in levels superior to an expected one coming restoring cuticular cells.