Network domain structure in phase-separating polymer solutions

Networklike Pattern Formation in Phase Separating Polymer Solutions: A Molecular Dynamics Study

The dynamics of phase separation of a quenched polymer solution is studied using a stochastic molecular dynamics simulation. At early times, the elastic nature of the polymer chains generates a networklike domain morphology for sufficiently dense polymer solutions. However, at late times, this network structure breaks up into disconnected polymer-rich domains to minimize the interfacial energy....

Induced circular dichroism of an optically active polyfluorene derivative in phase-separating solutions

When methanol, a nonsolvent, was added to dilute tetrahydrofuran solutions of an optically active polyfluorene derivative, liquid–liquid phase separation occurred, and circular dichroism (CD) was induced at a low temperature. The polymer concentration of the minor separating phase, estimated by light scattering, was very high (B0.4 g cm 3). The CD induction occurring in that concentrated phase ...

comparison between to versions of the SAFT EOS in the study of PVT and VLE phase behavior of pure polymer melts and binary polymer solutions

Shear-induced structure in polymer-clay nanocomposite solutions.

The equilibrium structure and shear response of model polymer-clay nanocomposite gels are measured using X-ray scattering, light scattering, optical microscopy, and rheometry. The suspensions form physical gels via the "bridging" of neighboring colloidal clay platelets by the polymer, with reversible adsorption of polymer segments onto the clay surface providing a short-range attractive force. ...

Scattering from deformed swollen gels with heterogeneities

When elastic materials are anisotropically deformed, heterogeneities in stiffness generally produce long-range density variations. The effect is particularly enhanced in swollen gels. We calculate the structure factor from such frozen density deviations under general alline deformations. It is maximized in the most stretched direction, whereas that from the thermal fluctuations is minimized in ...