Ultracentrifugal Evaluation of Chemical Potentials for the System Poly(chloroprene)—Methyl Ethyl Eetone

Abstract

In accordance with Scholte, an attempt was made to determine the chemical potentials of components in the system poly(chloroprene) (PCP)—methyl ethyl ketone (MEK) by the sedimentation equilibrium method. The measurements were performed at 15, 25, and 35°C over the range of polymer concentrations up to about 70 wt%. From the data the Flory—Huggins interaction parameter was determined as a function of composition and temperature. The results were then used to compute Flory’s enthalpy and entropy parameters (κ and ψ) at 25°C, the theta temperature for the system studied, over a wide range of compositions. It was found that the infinite-dilution values of these parameters are equal and unusually small, in conformity with the finding by Hanafusa et al., from light-scattering measurements. Finally, the results from equilibrium ultracentrifugation were checked by osmotic pressure data, though the comparison was limited to relatively low concentrations (<20 wt%).

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Murakami, H., Norisuye, T. & Fujita, H. Ultracentrifugal Evaluation of Chemical Potentials for the System Poly(chloroprene)—Methyl Ethyl Eetone. Polym J 7, 248–258 (1975). https://doi.org/10.1295/polymj.7.248

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Keywords

  • Poly(chloroprene)
  • Methyl Ethyl Ketone
  • Chemical Potential
  • Sedimentation Equilibrium
  • Osmotic Pressure
  • Flory—Huggins Interaction Parameter
  • Flory’s Enthalpy and Entropy Parameters

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