A new theory for polymer gels is developed on the basis of the single-chain mean-field (SCMF) theory. This theory takes the mesh chain or the star polymer as the characteristic unit of polymer gels, and it allows the study of chain conformation properties for gels in their different states. The preparation condition effect is conveniently described by the current theory, and the gels with compl...

We investigate the chain conformation of ring polymers confined to a cylindrical nanochannel using both theoretical analysis and three-dimensional Langevin dynamics simulations. We predict that the longitudinal size of a ring polymer scales with the chain length and the diameter of the channel in the same manner as that for linear chains based on scaling analysis and Flory-type theory. Moreover...

2014 We consider three types of critical points associated with the segregation of long, flexible, polymer chains : 1) one polymer + poor solvent, 2) two molten polymer species without solvent, 3) two dilute polymer species in a good solvent. For all these cases the Flory Huggins theory (or its extensions) would lead to a classical (mean field) type of critical behaviour. We analyse the critica...

Formation of asphaltene deposition during oil production, processing and synthesis is known as a fundamental problem of petroleum reservoir worldwide. Asphaltene is a petroleum fraction that can lead to increasing the operating costs in these industries. Variations in operational pressure, temperature and fluid composition are generally the significant cause of asphaltene precipitation. In ...

The modified Fischer-Tropsch synthesis (FTS) process is a promising technology for direct CO2 conversion into liquid fuels. However, the low yield of fuels (below 29%) observed during CO2-FTS still great concern commercial deployment. Therefore, new strategies are needed to improve both and fuel process. A steady-state model based on first principles Anderson-Schulz-Flory (ASF) distribution was...

Muriel Giansily-Blaizot1, Laurie Flory-Pigagniol1, Remi Favier2, Roula A. Farah3, Isabelle Martin-Toutain4, ElisabethVerdy5, Jean-Francois Schved1 1University Hospital Saint Eloi, Laboratory of Haematology, Montpellier, France; 2AP_HP Hospital Armand Trousseau, Laboratory of Haematology, Paris, France; 3Rizk Hospital, Department of Pediatrics, Beirut, Lebanon; 4AP_HP Pitie Salpetriere, Laborato...

Simplified mean field theory for the phase behaviour of polyelectrolytes in solution is described in detail. It can be viewed as the polyelectrolyte analogue of Flory-Huggins theory. A basic nlodel is analyzed, then extended to look at the effects of multivalent ions (specifically divalent coions), of distinguishable counterions, and of an ionization equilibriunl between counterions and polyele...