Propriedades fisico-quimicas de cabelos : avaliação de interações com corante e surfactantes

AUTOR(ES)
DATA DE PUBLICAÇÃO

1989

RESUMO

The human being give great importance to their hair, which is confirmed by the large variety of cometic and pharmaceutic products whose functions cover from mere cleaning torestoration attempts for damaged, falling hair, baldness and several other illnesses. This work has been directed toward the utilization of well-known techniques of evaluation of tlhe effects external agents upon human hair. Theses techniques are: determination of adsorption capacity, surfctant residue concentration by density measurement and internal structure analysis thrrough infrared spectroscopy (IR). The adsorption capacity is conviniently measured by the adsorption of Methylene Blue (MB) from aqueous solution after 6 hours at 0°C. Estimation of specific surface through adsorption data suplly: 5,79 m/g of hair and 2,26 m/g in buffered solution at pH=4,00. The MB desorption of hair was studied using surfactant, solutions 10% W/W after 12 hours at 0°C; the porcentages are: for SDDS, 7,15%; for CTAB,38,4%; for Triton X-100, 1,3%, and for Betainic Anphoteric (BA), 11,6%. Solutions density measurements are efficient for concentration determation to calculate the surfactant residue in hair, afer controled cleaning experiments, carried on with BA solutions. Surfactant desorption during rinse is 13 % after washing with 0,1% W/W aqueus BA ande 3% after washing with 1,0 W/W aqueous BA. IR spectra were obtained from KBr pellets. The spectra obtained from finely cut and sieved hair show good relolution an higt reproducibility. This preparation method is not sensitive enough to show any difference between clean hair and submitted to severe surfactant treatment. However, the IR spectra obtained from ultraviolet light irradiated hair, show the appearance of an absorption band at 1035 cm, arising from the S=O bond formed by photoxidation.

ASSUNTO(S)

cabelo

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