Molecular dynamics simulations of polyelectrolyte-polyampholyte complexes: Effect of solvent quality and salt concentration

Article Abstract:

Complexation between polyelectrolyte and polyampholyte chains in poor solvent conditions for the polyelectrolyte backbone was studied by molecular dynamics simulations. Weak electrostatic interactions show necklace formation driven by optimization of short-range monomer-monomer attraction and electrostatic repulsion between charged monomers on the polymer backbone and in the case of strong electrostatic interactions, the necklace structure appears as result of counteranion condensation.

Molecular dynamics, Monomers

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Calorimetric determination of surfactant/polyelectrolyte binding isotherms

Article Abstract:

Isothermal titration calorimetry (ITC) is used for determining surfactant/polyelectrolyte binding parameters as well as the enthalpy, entropy and Gibbs free energy of surfactant adsorption. The analysis has shown that the surfactant/polyelectrolyte adsorption process must have no more than two dominant binding states in order to apply the indirect ITC method of binding isotherm determination.

Usage, Gibbs' free energy, Chemical properties

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Blends of POSS-PEO[(n=4).sub.8] and high molecular weight poly(ethylene oxide) as solid polymer electrolytes for lithium batteries

Article Abstract:

The conductivity and phase transitions of blends of polyoctahedral silsesquioxanes (POSS)/poly(ethylene oxide) (PEO)[(n=4).sub.8], high molecular weight PEO, PEO(600K) and LiCl[O.sub.4] are investigated. The results have shown that the POSS/PEO[(n=4).sub.8]/LiCl[O.sub.4] is not compatible with the PEO(600K)/LiCl[O.sub.4], thereby resulting in microphase separation.

Electrical conductivity, Nanoparticles

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