Polymer/Solvent Interaction Parameters

1966 ◽  
Vol 39 (1) ◽  
pp. 149-192 ◽  
Author(s):  
C. J. Sheehan ◽  
A. L. Bisio
Keyword(s):  
Polymer Solutions ◽  
Interaction Parameters ◽  
Semiempirical Methods ◽  
Heat Of Mixing ◽  
Solvent Interaction ◽  
Entropy Effects ◽  
Enthalpy And Entropy ◽  
Solvent Systems ◽  
Pronounced Deviation ◽  
Polymer Solvent

Abstract Solutions in which one of the components is a high polymer and the other component is a small-molecule solvent behave in a markedly different manner than do solutions of low molecular weight components. For example, the latter obey Raoult's law if the heat of mixing is negligible; however, many polymer solutions show pronounced deviation from ideality even at concentrations of one percent or less (Figures 1–7). These deviations are due to enthalpy and entropy effects which arise from large differences in size between solvent and solute molecules. Ability to predict the solubility characteristics of polymer/solvent systems, and to calculate values of the colligative properties of such systems, is important in engineering studies of polymer processes. This paper presents a compilation of data which can be used in conjunction with the Flory-Huggins theory of polymer solutions to predict properties of polymer solutions. A method is given for predicting polymer/solvent interaction parameters (μ) for systems for which experimental data are not available. Also included is a comparison between the proposed method and two other semiempirical methods for predicting μ.

Polymer–solvent interaction parameters in polymer solutions at high polymer concentrations

2002 ◽  
Vol 969 (1-2) ◽  
pp. 245-254 ◽  
Author(s):  
C. Etxabarren ◽  
M. Iriarte ◽  
C. Uriarte ◽  
A. Etxeberrı́a ◽  
J.J. Iruin
Keyword(s):  
Polymer Solutions ◽  
Interaction Parameters ◽  
High Polymer ◽  
Solvent Interaction ◽  
Polymer Solvent

A New Look at Measurements of Network Density

1986 ◽  
Vol 59 (1) ◽  
pp. 138-141 ◽  
Author(s):  
Robert A. Hayes
Keyword(s):  
Hysteresis Loop ◽  
Interaction Parameters ◽  
Network Density ◽  
Stress Strain ◽  
Solvent Interaction ◽  
Solvent Method ◽  
Strain Data ◽  
Good Agreement ◽  
Polymer Solvent ◽  
New Look

Abstract A two-solvent method for determining the polymer-solvent interaction parameters independently of stress-strain data is described. The values obtained are much lower than those reported previously. Network densities calculated from swelling data and these interaction parameters are in good agreement with those calculated from the return portion of a hysteresis loop at high elongations.

The Polymer-Solvent Interaction Parameter X

1977 ◽  
Vol 50 (3) ◽  
pp. 451-479 ◽  
Author(s):  
R. A. Orwoll
Keyword(s):  
Interaction Parameter ◽  
Chemical Potential ◽  
Volume Fraction ◽  
Solvent Interaction ◽  
Solvent Systems ◽  
Colligative Properties ◽  
Polymer Solvent

Abstract The interaction parameter X has been defined as a measure of the chemical potential of the solvent in solutions with a polymeric solute. Consequently a number of equilibrium properties can be expressed as functions of X. Values of X determined from these properties reveal that for most systems this quantity increases with the volume fraction of polymer in the solution. Accordingly, values of the interaction parameter have been tabulated as a function of concentration, as well as of temperature. The values of X obtained either from experiment or theory can be utilized for predicting the colligative properties and determining the solubility characteristics of polymer-solvent systems.

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