PH-sensitive particles of polymer-surfactant complexes based on a copolymer of N,N′-diallyl-N,N′-dimethylammonium chloride with maleic acid and sodium dodecyl sulfate

Abstract

The complex formation of copolymer of DADMAC-MA (N,N′-diallyl-N,N′-dimethylammonium chloride with maleic acid) and SDS (sodium dodecyl sulfate) were studied. Complexes self-assemble into dispersion of particles of polymer-surfactant complexes (PSC) in aqueous solutions, with a change in the concentration of NaCl and the amount of neutralized carboxyl groups of DADMAC-MA macromolecules by alkali. The DADMAC-MA/SDS complexes were characterized by spectroscopy (SEM, NMR, FT-IR, and UV), thermal analysis (TGA and DSC), and laser light scattering. The average particle sizes of PSC dispersions, depending on the composition of the reaction mixture and the neutralization degree of the DADMAC-MA carboxyl groups (f), vary in the range from 170 to 600 nm. The values of the critical concentration of SDS aggregation in the presence of DADMAC-MA are determined at different f. The possibility of influencing the phase transitions of the DADMAC-MA / SDS system by changing the ionic strength of the solution and the neutralization degree of DADMAC-MA carboxyl groups is shown. The ability of PSC particles to solubilize molecules of substances poorly soluble in water has been evaluated.