Abstract
Isothermal titration calorimetry was used to investigate the binding characteristics of sodium dodecyl sulfate (SDS) and PEP-type [P and E represent poly(oxypropylene) and poly(oxyethylene), respectively] triblock copolymers in aqueous solution. Beyond the critical aggregation concentration (CAC), PEP/SDS aggregation complexes are formed through the polymer-induced micellization process. SDS monomers first bind to the PPO segments followed by binding to the PEO segments. The polymer chains are dehydrated and solubilized in the hydrophobic core of SDS micelles containing an aggregation number smaller than that of free SDS micelles in water. From the contribution to the Gibbs energy, it is found that the formation of polymer/SDS aggregation complex is an entropic-driven process. The CAC is independent of the molecular weight of polymer, is weakly dependent on the polymer concentrations, and is strongly dependent on polymer composition. An increase in the length of PPO segments results in the reduction in th...
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