Thermodynamic Study of Poly(dimethylsiloxane)-Solvents Systems Using Inverse Gas Chromatography

Inverse Gas Chromatography를 이용한 Poly(dimethylsiloxane)-Solvent계의 열역학적 연구

  • Cho, Joung-Mo (Department of Chemical Engineering, Chonnarn National University) ;
  • Kang, Choon-Hyoung (Department of Chemical Engineering, Chonnarn National University)
  • Received : 1999.04.10
  • Accepted : 1999.07.10
  • Published : 1999.08.10

Abstract

In order to investigate the interaction characteristics of poly(dimethylsiloxane) (PDMS) with various solvents such as water, ethanol, and iso-propanol, Inverse Gas Chromatography(IGC) at finite concentration, which is a very fast, accurate, and thus promising technique in thermodynamic study of polymer systems, is employed. By measuring the specific retention volumes of the probes, the interaction parameters are calculated by means of the Flory-Huggins equation. From the results, the interaction parameters of the probes are, as expected due to the hydrophobicity of the polymer, found to be of large positive values (2$2.0{\times}10^{-3}mol/g$. For the linear PDMS, interpretation of the space distribution of molecules is performed by the Kirkwood-Buff-Zimm(KBZ) integrals, which give intuitive information about physical properties. From the KBZ integrals, water does not show the tendency of preferential solvation with the PDMS but formed self-cluster. The larger solvent molecules show a stronger tendency to distribute more randomly in the mixture.

Acknowledgement

Supported by : 전남대학교

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