Thermodynamics of poly(methylphenylsiloxane)-alkane systems by gas-liquid chromatography

Humpa, Otakar; Uhdeová, Jitka; Roth, M.

doi:10.1021/ma00009a058

Cited by 14 publications

(12 citation statements)

References 6 publications

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“…A smaller polar interaction agrees better with the nonpolar properties of PDMS, such as low surface tension. The overall solubility parameter of PDMS based on the second method is 13.8 (J/cm 3 ) 0.5 at 90°C, which is near the result of Humpa et al24 at the same temperature, 13.4 (J/cm 3 ) 0.5 . In the second method PEE had a small polar component.…”

Section: Models For Enthalpy Of Solutionsupporting

confidence: 77%

“…PDMS has been studied by IGC methods. 2,8,[22][23][24][25] These three polymers were chosen because they were nonpolar and their interactions were dominated by the dispersion force. Without the influence of different types of interaction in polymers, the entropyenthalpy compensation may be more readily observed.…”

Section: Results Of Three Polymersmentioning

confidence: 99%

“…Three polymers, isotatic polypropylene (PP), poly(ethyl ethylene) (PEE), and poly(dimethylsiloxane) (PDMS), were selected for this study. PDMS has been studied by IGC methods 2, 8, 22–25. These three polymers were chosen because they were nonpolar and their interactions were dominated by the dispersion force.…”

Section: Results Of Three Polymersmentioning

confidence: 99%

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Entropy–enthalpy compensation in solution properties of solutes at infinite dilution in nonpolar polymers

Huang

2007

J of Applied Polymer Sci

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The knowledge of the Flory-Huggins interaction parameter, w, between organic liquids and polymers is very important in the study of their miscibility. From the temperature dependency of w the enthalpy and residual entropy of solution can be determined. In this study literature data of thirty-two solutes, ranging from alkanes to alcohols, at infinite dilution in isotatic polypropylene, poly(ethyl ethylene), and poly(dimethylsiloxane), were tested and linear entropy-enthalpy compensation was observed. The plot of residual free energy versus enthalpy of solution was also linear, with a lower correlation coefficient than the entropyenthalpy plot. The range of enthalpy of solution was wider than those of the size corrected free energy of solution. In nonpolar solvents the enthalpy of solution reflected largely the interaction within the solute liquid state, and showed a linear trend with respect to solute cohesive energy density for n-alcohols. The wide range of enthalpy of solution suggests the use of a two-dimensional solubility parameter model to correlate the enthalpy of solution.

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Section: Models For Enthalpy Of Solutionsupporting

confidence: 77%

Section: Results Of Three Polymersmentioning

confidence: 99%

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Entropy–enthalpy compensation in solution properties of solutes at infinite dilution in nonpolar polymers

Huang

2007

J of Applied Polymer Sci

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“…The values were ∼ 0.3 and showed a small probe dependence; they were higher for linear alkanes and smaller for aromatic probes. Since then many studies20–26 were made to determine the solubility parameters of polymers, a collection of studies of the Flory–Huggins interaction parameters and solubility parameters of polymers was published by Barton 27…”

Section: Methods To Determine the Solubility Parametermentioning

confidence: 99%

Methods to determine solubility parameters of polymers at high temperature using inverse gas chromatography

Huang

2004

J of Applied Polymer Sci

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Experimental values of Flory-Huggins parameters, , between polymers and probes, are frequently used to determine the solubility parameters of the polymers by the method of DiPaola-Baranyi and Guillet. The solubility parameters of probes were usually estimated by using heat of vaporization. When is measured at a temperature near the critical temperature of the probes and used to determine the solubility parameter of polymers, the departure of enthalpy of the probe vapor from the ideal gas state should be considered. This study discussed the method to make the correction and its effect on the determination solubility parameter of polymers. Without correction in the vapor phase enthalpy, the solubility parameters of the probes and polymer tend to be underestimated and the error increases when the critical temperature is approaching. Analytical expressions for the effect of correction on the solubility parameter of probes and parameters of polymers were derived. By use of probes with a range of solubility parameters on both sides of the solubility parameter of polymers, the correlation between parameters of polymers was shown to be reduced.

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“…The former states of materials are characterized by linear dependence of log V g versus 1/ T with positive slopes (negative enthalpy of sorption). Numerous examples of such retention diagrams are available in the literature, and some examples can be found in refs − .…”

Section: Polymers Above and Below The Glass Transition Temperaturesmentioning

confidence: 99%

Investigation of Polymers by Inverse Gas Chromatography

Yampolskii

Белов

2015

Macromolecules

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This Perspective conveys to the general reader of Macromolecules the basic ideas and possibilities of inverse gas chromatography (IGC). This method which appeared about 50 years ago is now a versatile tool for investigation of the interactions of polymers with vapors and study of polymer properties. The focus of this Perspective is on the study of bulk sorption of low molecular weight compounds in polymers. The results of chromatographic determination of solubility coefficients and sorption isotherms as well as the diffusion coefficients of vapors in polymers are discussed. Special attention is paid to the thermodynamic properties of glassy polymers on the phenomena in the vicinity of the glass transition. Information on IGC as a probe method for the determination of free volume in polymers is also presented.

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Thermodynamics of poly(methylphenylsiloxane)-alkane systems by gas-liquid chromatography

Cited by 14 publications

References 6 publications

Entropy–enthalpy compensation in solution properties of solutes at infinite dilution in nonpolar polymers

Entropy–enthalpy compensation in solution properties of solutes at infinite dilution in nonpolar polymers

Methods to determine solubility parameters of polymers at high temperature using inverse gas chromatography

Investigation of Polymers by Inverse Gas Chromatography

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