Banca de DEFESA: LARISSA PAULA ALVES MAURICIO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : LARISSA PAULA ALVES MAURICIO
DATA : 08/05/2019
HORA: 14:30
LOCAL: Sala 4 da ECT
TÍTULO:

Characterization of Nanostructural Changes in Hair Fibers with Conventional and Professional Treatment

PALAVRAS-CHAVES:

Hair, hair treatment, chemical process

PÁGINAS: 105
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
SUBÁREA: Tecnologia Química
ESPECIALIDADE: Têxteis
RESUMO:

Hair treatments have the purpose to protect and treat the threads of external aggressions and chemical processes. However, due to the increasing technological advance it is necessary to be aware of the choice of the ideal treatment for the type of damage that exists. This work aims to analyze the products available in the market both professional and conventional hair nutrition applied in numerous chemical processes, which is justified by the difficulty of finding scientific information on treatment protocols. Samples of virgin hair and smoothing, dyeing and discoloration processes were analyzed before and after changes caused by different conventional and professional hair nutrition treatments. In addition to verifying the efficiency of hydration treatments after such nano-residual damage caused by these chemical processes separately. For capillary characterization, X-ray diffraction, Infrared spectroscopic techniques were used, and scanning electron microscopy (SEM) was used for morphological analysis. This research demonstrated, through vibrational spectroscopy, a predominant difference between virgin and chemically treated hair. After the treatments it was possible to observe that several important bonds were modified, such as the S-S, SO₃, C-H, C = O bonds as well as the secondary structures of proteins that underwent changes in their conformations. The results demonstrate that the chemical processes modified the conformational structure of keratin, and that the sum of these is harmful to the fiber, chemically and physically modifying the capillary structure. Although such products are intended to positively change the structure and appearance of the hair, they result in some undesirable damage. Vibrational spectroscopy together with scanning electron microscopy was effective tools for the analysis of the level of capillary fiber wear. It is inferred that the electron microscopy confirmed that the chemical treatment that stood out in the performed analyzes is the professional product more specifically in the process of greater degradation of the fiber that was the discoloration followed by dyeing. This demonstrated that the professional treatment caused a different pattern of morphological deformation on the capillary surface at levels higher than expected reaching to restore cuticle cells.

MEMBROS DA BANCA:
Presidente - 1481705 - SALETE MARTINS ALVES
Interno - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Interna - 2212519 - JULIANA DE SOUZA NUNES
Externo à Instituição - SÍLGIA APARECIDA DA COSTA - USP