Statistical thermodynamics of polydisperse polymer systems in the framework of lattice fluid model: Effect of molecular weight and its distribution on the spinodal in polymer solution

2002 ◽  
Vol 116 (13) ◽  
pp. 5892-5900 ◽  
Author(s):  
Jian Yang ◽  
Zhaoyan Sun ◽  
Wei Jiang ◽  
Lijia An
Keyword(s):  
Molecular Weight ◽  
Polymer Solution ◽  
Fluid Model ◽  
Statistical Thermodynamics ◽  
Polymer Systems ◽  
Lattice Fluid ◽  
Polydisperse Polymer

Application of Gas-Liquid Chromatography to the Thermodynamics of Polymer Solutions

1972 ◽  
Vol 45 (6) ◽  
pp. 1638-1645
Author(s):  
D. Patterson ◽  
Y. B. Tewari ◽  
H. P. Schreiber ◽  
J. E. Guillet
Keyword(s):  
Molecular Weight ◽  
Liquid Chromatography ◽  
Polymer Solution ◽  
Gas Phase ◽  
Infinite Dilution ◽  
Solution Thermodynamics ◽  
Gas Liquid Chromatography ◽  
High Polymer ◽  
Activity Data ◽  
Polymer Systems

Abstract It has been well established that gas—liquid chromatography (glc) can give accurate thermodynamic data on binary solutions where the components differ considerably in volatility or molecular weight. The substance of lower molecular weight (component 1) is injected into the moving gas phase and dissolves at effectively infinite dilution in the stationary liquid phase. This is formed by the higher molecular weight material, for example, squalane, biphenyl, dinonyl phthalate, glycerol, or the higher n-alkanes such as C16, C24, C36, etc. The convenience of the technique is such that activity coefficient data have already been obtained for hundreds of systems. In contrast, activity data are available for far fewer high polymer systems, in part certainly because of the need to use the laborious vapor sorption technique. While that technique gives activity data as a function of concentration, it would still be desirable to have data at infinite dilution for a variety of systems in order to test contemporary theories of polymer solution thermodynamics. Recently Guillet and coworkers have applied the glc technique to systems in which the stationary phase is a high polymer. (J. E. Guillet and coworkers refer to the gas-phase component as the molecular “probe”. This avoids the glc teminology in which that component is the solute and the stationary-phase polymer would be the solvent. This terminology is confusing to polymer chemists used to solutions where the polymer is the solute, being present at low, rather than high, concentrations.) Their primary interest has been to demonstrate the versatility of the technique in determining first- and second-order phase transitions, degrees of crystallinity, and other physical characteristics of the polymer, while the present communication considers the determination of thermodynamic quantities. It has been prompted by comments from several workers who have noted the difficulty of applying the usual thermodynamic equations of glc which yield γ1∞, the activity coefficient of component 1 at infinite dilution [Equations (5) and (6)]. The equations require an exact value of the molecular weight of component 2, making difficult their use for polymer systems. Our main objective is to resolve this problem. However, we also wish to stress the utility of the technique in providing data with which to test contemporary theories of polymer solution thermodynamics. We therefore comment on equations which directly relate experimental glc data to the interaction parameter, χ, of polymer solution thermodynamics.

scholarly journals Study Rheological Behavior of Polymer Solution in Different-Medium-Injection-Tools

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 319 ◽  
Author(s):  
Bin Huang ◽  
Xiaohui Li ◽  
Cheng Fu ◽  
Ying Wang ◽  
Haoran Cheng
Keyword(s):  
Molecular Weight ◽  
Polymer Solution ◽  
Oil Recovery ◽  
Injection Pressure ◽  
Injection Rate ◽  
Injection Velocity ◽  
Structural Parameter ◽  
Local Perturbation ◽  
Polymer Injection ◽  
Single Pipe

Previous studies showed the difficulty during polymer flooding and the low producing degree for the low permeability layer. To solve the problem, Daqing, the first oil company, puts forward the polymer-separate-layer-injection-technology which separates mass and pressure in a single pipe. This technology mainly increases the control range of injection pressure of fluid by using the annular de-pressure tool, and reasonably distributes the molecular weight of the polymer injected into the thin and poor layers through the shearing of the different-medium-injection-tools. This occurs, in order to take advantage of the shearing thinning property of polymer solution and avoid the energy loss caused by the turbulent flow of polymer solution due to excessive injection rate in different injection tools. Combining rheological property of polymer and local perturbation theory, a rheological model of polymer solution in different-medium-injection-tools is derived and the maximum injection velocity is determined. The ranges of polymer viscosity in different injection tools are mainly determined by the structures of the different injection tools. However, the value of polymer viscosity is mainly determined by the concentration of polymer solution. So, the relation between the molecular weight of polymer and the permeability of layers should be firstly determined, and then the structural parameter combination of the different-medium-injection-tool should be optimized. The results of the study are important for regulating polymer injection parameters in the oilfield which enhances the oil recovery with reduced the cost.

Lattice-Fluid Model for Solvation Force Oscillations in Nonionic Fluid Films

1995 ◽  
Vol 170 (2) ◽  
pp. 407-420 ◽  
Author(s):  
Vladimir S. Mitlin ◽  
Mukul M. Sharma
Keyword(s):  
Fluid Model ◽  
Fluid Films ◽  
Lattice Fluid

Liquid–liquid equilibria of polydisperse polymer systems

1999 ◽  
Vol 35 (9) ◽  
pp. 1703-1711 ◽  
Author(s):  
Jin Jung Choi ◽  
Young Chan Bae
Keyword(s):  
Polymer Systems ◽  
Polydisperse Polymer
Sign in / Sign up

Export Citation Format

Share Document