J. J. García Domínguez

Use of microemulsions as vehicles for nucleophilic reagents in cosmetic formulations

The modifications of chemical reactivity induced in the human hair during its treatment with oxidative (H2O2) or reductive (HSO3Na) agents via a micellar or a microemulsion system have been investigated. For this purpose, phase diagrams of micellar solutions and microcmulsions with H2O2 or NaSO3H have been made in order to find out the corresponding areas of solubility. The properties of conductivity, surface tension and light scattering of various monophasic compositions as a function of their water content, have been studied.

30—INTERACTIONS BETWEEN ALKYLSULPHATES AND CATIONIC SHRINK-RESIST RESINS FOR WOOL PART I: THE INFLUENCE OF THE SURFACTANT CHAIN LENGTH

A kinetic study of the formation of Hercosett–alkylsulphate aggregates is reported. The stability of the turbidity that the aggregates confer to the solution was investigated as a factor of time and the concentrations of each surfactant, i.e., C8−, C10−, C12−, and C14−alkylsulphates.

14—INTERACTIONS BETWEEN ALKYLSULPHATES AND CATIONIC SHRINK-RESIST RESINS FOR WOOL PART III: THE INFLUENCE OF ELECTROLYTES AT VARIOUS pH VALUES ON THE SHRINKAGE OF KNITTED WOOL FABRICS

The interaction between a cationic resin, such as Hercosett, and anionic surfactants is greatly affected by the pH of tbe media as well as by the presence of electrolytes in the treatment bath A study IS presented of how both factors affect tbe shrink-resist properties of the Hercosett-surfactant aggregates on wool fibres for knitted wool fabrics pre-treated with methylamine or hydrogen peroxide.

20—INTERACTIONS BETWEEN IONIC SURFACTANTS AND WOOL

A study is reported of the adsorption mechanism of two ionic surfactants (sodium dodecyl sulphate and hexadecyl trimethyl ammonium bromide)on wool in relation to the temperature or time of treatment, either in aqueous or in aqueous-ethanolic media. From the results obtained, the effects of these ionic surfactants on acid and alkaline treatments of wool were evaluated by the alkali-solubility test, determination of the cystine content of the fibres, and analysis of the new amino acids formed during the treatment of wool fibres with methylamine or dimethylamine.