The Scott-Magat polymer theory, which assumes that polymers have heterogeneous structure and takes into account the polydispersity in the molecular weight of polymers, is a method to model asphaltene precipitation conditions. The traditional Scott-Magat polymer theory based models assume that the precipitated phase consists of asphaltene only. In the present work, we introduce a model based on ...

We propose a new type of diffuse interface model describing the evolution tumor mass under effects chemical substance (e.g., nutrient or drug). The process is described by utilizing variables ?, an order parameter representing local proportion cells, and ?, concentration chemical. ? assumed to satisfy suitable form Cahn–Hilliard equation with source logarithmic potential Flory–Huggins (or gener...

In this paper, we construct and analyze a uniquely solvable, positivity preserving unconditionally energy stable finite-difference scheme for the periodic three-component Macromolecular Microsphere Composite (MMC) hydrogels system, ternary Cahn-Hilliard system with Flory-Huggins-deGennes free potential. The proposed is based on convex-concave decomposition of given functional two variables, cen...

The pH and NaCl induced swelling response and drug and protein loading of poly(methacrylic acid-co-acrylic acid) microgels (4-10 μm diameter) were measured as a function of cross-link density. The swelling ratio (Q) of the microgels increased linearly from 2 to 12 when the mole fraction of crosslinking monomer decreased from 0.25 to 0.10 (at pH’s > 5.3). In the presence of 5 M NaCl (at pH’s > 5...

The aim of this contribution is to examine the impact incorporating surfactants into amorphous solid dispersions on state miscibility and aqueous solubility antifungal drug griseofulvin. Spray dried griseofulvin (GF) hypromellose acetate succinate (HPMCAS) were prepared by spray drying. Three different varying ratios between 1 5% used namely anionic sodium dodecyl sulfate (SDS), cationic dodecy...

An elastomeric gel is a cross-linked polymer network swollen with a solvent (fluid). A continuum-mechanical theory to describe the various coupled aspects of fluid permeation and large deformations (e.g., swelling and squeezing) of elastomeric gels is formulated. The basic mechanical force balance laws and the balance law for the fluid content are reviewed, and the constitutive theory that we d...

We studied the effect of salt addition on a diblock copolymer system with negative Flory–Huggins interaction parameter, χ, indicative attractive interactions between two blocks. The is poly(ethylene oxide)-block-poly(methyl methacrylate) (PEO-PMMA) added lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) salt. asymmetric block copolymers, PEO-PMMA(10–33) and PEO-PMMA(10–64), where numbers refe...

The most important part of the membrane synthesis process so that it has desired pores is solidification membrane, begins with a change from one liquid phase into two phases (liquid-liquid demixing). At certain period during demixing, polymer-rich solidifies; thus, dense matrix formed. Parameters determine mechanism formation are based on thermodynamics including separation Solvent-Polymer-Non-...