Mutual Diffusion in the Miscible Polymer Blend: Polystyrene:Poly (Xylenyl Ether)

  • R. J. Composto
  • E. J. Kramer
  • Dwain M. White


We have used forward recoil spectrometry to measure the mutual diffusion and tracer diffusion coefficients, D and D*, in the miscible polymer blend of deuterated polystyrene (d-PS):poly(xylenyl ether) (PXE). Using the “fast theory” of mutual diffusion, D is related to the D*, degree of polymerization N, and volume fraction φ of the individual blend components by, D = 2 φ (1-φ) [D* PS N PS + φD* PXE N PXE ](χ S -χ), where χ and χs are tne Flory interaction parameter of the blend and its value at the spinodal. From the measured values of the D*’s and D at a volume fraction φ=0.55 of d-PS, the interaction parameter χ=0.112-62/T was estimated as a function of temperature T(K). At low T, D was much larger than D*’s due to the large negative value of χ whereas at high T, D becomes less than the D*’s as χ becomes positive (thermodynamic slowing down). Similar measurements show that χ is not markedly composition-dependent in the d-PS:PXE blends.


Lower Critical Solution Temperature Mutual Diffusion Entire Composition Range Tracer Diffusion Coefficient Mutual Diffusion Coefficient 
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Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • R. J. Composto
    • 1
    • 2
  • E. J. Kramer
    • 1
  • Dwain M. White
    • 3
  1. 1.Dept. of Mater. Sci. & Eng.Cornell UniversityIthacaUSA
  2. 2.Polymer Science and EngineeringUniversity of MassachusettsAmherstUSA
  3. 3.General Electric Corp. Research and DevelopmentSchenectadyUSA

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