Summary The solution behaviour of new cationic surfactants, synthesized by using long-chain Guerbet alcohols, in water was investigated by a polarizing microscopic technique, differential scanning calorimetry, and electric conductivity measurements. These surfactants show the gel-liquid crystalline phase transition to be lower than 0 degrees C and form lamellar liquid crystals even in cold water and at low concentrations of surfactants. The sorption of cationic surfactants from aqueous solutions onto hair was determined as a function of temperature. The effect of adsorbed cationic surfactants on the critical surface tension and kinetic frictional coefficients of hair surface have been investigated. These surface characteristics of hair treated with quaternary ammonium compounds derived from Guerbet alcohols were found to be significantly improved. These results can be explained by the high ability of sorption onto hair. Hair rinses and conditioners having excellent ease of combing or brushing for wet and dry hair can be formulated by the application of these cationic surfactants.
The diffusion rates of several acid dyes were determined using the unstretched nylon gut.The method consists of measuring the dye penetration from the observation of ring-dyed gut section by means of microscope.The pentration distance is proportional to the square root of dyeing time, and in general increases as the dye concentration increases and the pH of dyebath decreases:From the temperature dependence of diffusion rate the apparent activation energy of diffusion is calcurated.The diffusion rate varies from dye to dye but its temperature dependence remains almost the same. (Received 4. 1. 1956)
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