Abstract
A novel statistical model for the cooperative binding of monomeric ligands to a linear lattice is developed to study the interaction of ionic surfactant molecules with flexible polyion chain in dilute solution. Electrostatic binding of a ligand to a site on the polyion and hydrophobic associations between the neighboring bound ligands are assumed to be stochastic processes. Ligand association separated by several lattice points within defined width is introduced for the flexible polyion. Model calculations by the Monte Carlo method are carried out to investigate the binding behavior. The hypothesis on the ligand association and its width on the chain are of importance in determining critical aggregation concentration and binding isotherm. The results are reasonable for the interpretations of several surfactant-flexible polyion binding experiments. The implications of the approach are presented and discussed.
Highlights
Complex formation of surfactant molecules with polymer chain is one of the most important and attractive subjects in colloid and polymer science
The cooperative nature is due to the side-by-side hydrophobic interactions of the aliphatic tail of the surfactant molecules bound to the polyion chain
Introducing the non-cooperative binding and the ligand association separated by multiple lattice points, we can show their effects as new factors that determine the binding isotherm
Summary
Complex formation of surfactant molecules with polymer chain is one of the most important and attractive subjects in colloid and polymer science. It is useful in various fields of applied chemistry, such as pharmaceutical chemistry, food science, cosmetic manufacture, and so on. One of the interesting subjects to be revealed in this field is the cooperative nature of surfactant binding due to the hydrophobic interactions among bound surfactant molecules on the polyion chain. The cooperative nature is due to the side-by-side hydrophobic interactions (association) of the aliphatic tail of the surfactant molecules bound to the polyion chain
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