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E. A. Vasil'eva^1,2, A. R. Ibragimova², F. G. Valeeva², S. S. Lukashenko², L. Ya. Zakharova^1,2

Author affiliations
¹Kazan National Research Technological University,
Karl Marx str., 68, 420015 Kazan, Tatarstan. Russia
²A. E. Arbuzov Institute of Organic and Physical Chemistry RAS,
acad. Arbuzova str., 8, 420088 Kazan, Russia. 
E-mail: lucia@iopc.ru

Abstract
Factors controlling the complexation of mono- and dicationic (gemini) surfactants with a weak polyelectro-lyte, polyacrylic acid (PAA) are elucidated. By the example of monocationic surfactants cetyltrimethylammonium bromide and 1-hexadecyl-4-aza-1-azoniabicyclo[2,2,2]octane bromide, the influence of the head group nature and solution pH on the interaction was shown; the quantitative parameters of aggregates were measured. The com-plexation of PAA with geminis is markedly influenced by the hydrophobicity of surfactants. A decrease in the alkyl chain length results in synergetic interactions of components, which is confirmed by the lower values of critical aggregation concentration.

Keywords: cationic and gemini surfactants, head group, hydrophobicity, polyacrylic acid, aggregation, zeta potential