Hydrophobicity polyelectrolyte dynamics

DSA (see Pig. 2), they were able to extract indirectly information of the structure and dynamics of the complex formed [86] in dependence of the surfactant concentration and the pH. Such complexes of hydrophobic ally modified polyelectrolytes or ionic polymers with surfactant have unusual properties (in particular rheological) and are therefore widely used in, e.g., cosmetics or food applications. 

Liu Z, Shang Y, Feng J, Peng C, Liu H, Hu Y Effect of hydrophilicity or hydrophobicity of polyelectrolyte on the interaction between polyelectrolyte and surfactants molecular dynamics simulations, y Phys Chem B 116(18) 5516—5526, 2012. 

Liu ZH, Lv WJ, Zhao SL, et al. Effects of the hydrophihcity or hydrophobicity of the neutral block on the stmcmral formation of a block polyelectrolyte/surfectant complex a molecular dynamics simulation study, Comput Condens Matter 2 16—24, 2015c. 

Costa T, Miguel MG, Lindman B et al (2005) Dynamics and energetics of the self-assembly of a hydrophobically modified polyelectrolyte naphthalene-labeled poly(acrylic acid). J Phys Chem B 109 11478-11492... 

Figure 22.28 and Figure 22.29 show, respectively, the H and C-NMR spectra of the oligoesters prepared from epoxidized sunflower oil methyl esters (methyl biodiesel from sunflower oil) and di-l,2-cyclohexanedicarboxylic anhydride using triethylamine as initiator. These materials are soluble in common organic solvents such as acetone, ethanol, tetrahydrofurane, and chloroform, but insoluble in water. Oligoesters from epoxidized biodiesel can be used as intermediate materials for the synthesis of polyelectrolytes by saponification reactions with aqueous solution of sodium or potassium hydroxide at room temperature (Fig. 22.27). The products obtained after saponification present solubility in water. Amphiphilic materials, such as the polyelectrolytes prepared from epoxidized biodiesel, have hydrophobic and hydrophilic segments. They can spontaneously self-organize in a wide variety of structures in aqueous solution. Understanding the dynamics of the formation and transition between the various self-organized structures is important for technological applications.

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