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

Abstract

It has been well established3-7 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,3 squalane, biphenyl, dinonyl phthalate, glycerol, or the higher «-alkanes such as Cíe, 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

Pyrolysis and Devolatilization of High-Density Polyethylene

“…Such correlations can be inverted to give an estimate of the critical carbon number as a function of temperature. Inverting the correlation suggested by Egloff et al [17] yields (19) where T is in units kelvin. Within the range of carbon numbers 2 to 19, the model agrees with experimental data to within less than one percent.…”

“…Patterson et al [19] report a value of 0.18 +/-0.05 for n-decane in a linear polyethylene at temperatures between 418-463 K and for small values of volatile volume fraction. Similar work by Brockmeier et al [20] indicates that the dependence of the interaction parameter on volatile volume fraction is negligible for volume fractions between 0.01 and 0.18.…”

Interaction Parameters of Surfactant Mixtures by Inverse Gas Chromatography

“…Patterson (Patterson et al, 1971) suggested using the weight fraction, w, in which case equation (3) …”

Vapor‐liquid equilibria from perturbation gas chromatography. Part II: Application to the polybutadiene/benzene/cyclohexane ternary system

“…Patterson et al (1971) introduced the infinite-dilution weight-fraction activity coefficient to describe the thermodynamic properties of polymer-solvent systems. This concept circumvented the need to know accurately the polymer molecular weight and defincd an activity coefficient that remained bounded as polymer molecular weight became unbounded.…”