Abstract
The interactions between a series of cationic surfactants (alkyltrimethylammonium bromides) (CnTAB) and the anionic polymer sodium poly(styrenesulfonate) (NaPSS) have been studied using surface tension and neutron reflectivity. The effect of surfactant chain length on surfactant/polymer adsorption has been studied using chain lengths from 10 to 16 carbon atoms (i.e. C10TAB to C16TAB). The surface tension plots (γ against ln c) have two types of shape. The C10TAB and C12TAB with NaPSS systems have plots with plateaus, while the longer chain C 14TAB and C16TAB systems have a pronounced hump in the surface tension at surfactant concentrations just below the critical micelle concentration (cmc) of the free surfactant. Neutron reflection shows that there is a surfactant monolayer (thickness 20−22 A) adsorbed at dilute surfactant concentrations for the C10TAB, C12TAB, and C14TAB systems, but this changes to a thick layer (60−100 A) at concentrations closer to the cmc. The corresponding areas per adsorbed surfac...
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