Phase separation conditions in polystyrene–styrene–(butadiene–styrene) copolymer solutions

Competition between the micellization and the liquid–liquid phase separation in amphiphilic block copolymer solutions

We have formulated the mixing Gibbs energy density for the micelle phase of an amphiphilic block copolymer solution using mean-field lattice theory. We have found a transition between the micellization and the liquid–liquid phase separation in this solution by comparing the mixing Gibbs energy density for the micelle phase with that for the homogeneous phase. Micellization is preferred over the...

Phase-separation Phenomena in Polymer Solutions

Phase Separation in Multicomponent Aqueous-Protein Solutions

published in Advance ACS Abstracts, December 1, 1994. 0022-3654/95/2099-0454$09.00/0 we present here the results of experimental and theoretical studies of a ternary solution constituted of the proteins yma (designated as protein A), a “high-Tc” protein, and yw (designated as protein B), a “low-Tc” protein, in aqueous solution. The solution pH was kept constant at 7.1 by a 100 mM phosphate buff...

Phase Separation in Highly Charged Confined Ionic Solutions

We study phase separation in ionic solutions confined by solid objects carrying surface charges. Within the framework of Density Functional Theory, the Helmholtz free energy of the ionic solution is minimized under canonical constraints on the ionic densities fixing their mean value while ensuring global electroneutrality. The free energy splits into a bulk and an electrostatic contribution. Th...

Phase Separation in Polymer Solutions Induced by Shear

We numerically investigate nonlinear regimes of shear-induced phase separation in entangled polymer solutions. Use is made of a time-dependent Ginzburg-Landau model describing two fluid dynamics of polymer and solvent. As a new dynamic variable a conformation tensor is introduced to represent chain deformations. Above the coexistence curve a dynamical steady states is attained, where fluctuatio...