Ion-exchange controls the kinetics of deswelling of polyelectrolyte microgels in solutions of oppositely charged surfactant.

摘要: The kinetics of deswelling sodium polyacrylate microgels (radius 30−140 μm) in aqueous solutions dodecyltrimethylammonium bromide is investigated by means micropipet-assisted light microscopy. purpose the study to test a recent model (J. Phys. Chem. B 2003, 107, 9203) proposing that rate volume change controlled transport surfactant from solution gel core (ion exchange) via surfactant-rich surface phase appearing during transition. Equilibrium swelling characteristics network surfactant-free and with various amounts present are presented discussed reference related systems. A relationship between degree binding determined used theoretical predictions kinetics. Experimental data for single beads observed under conditions forced convection compared calculations. It de...