Abstract
A marked increase in viscosity is produced in solutions of dodecyl, tetradecyl pyridinium bromide, cetylpyridinium chloride, benzalkonium chloride, and benzethonium chloride containing salicylic acid. The viscosity increases with acid concentration to a maximum and then decreases. This viscosity effect is absent in quaternary ammonium compounds which are not surface active. Solutions of alkyl pyridinium and alkyl trimethyl ammonium compounds in the presence of salicylic acid form non-Newtonian systems which are dilatant while the alkyl aryl dimethyl compounds containing the same acid form Newtonian systems. The different rheological behavior is probably due to the number of substituents, R1 R2 … present which are responsible for the surface activity of the molecule and which are attached to the nitrogen atom. The amount of salicylic acid required to produce maximum viscosity is directly proportional to the concentration of the quaternary ammonium compound which exhibits Newtonian flow.
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