The dynamics of polymer blends: interdiffusion and the glass transition

  • M. G. Brereton
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 91)


In this paper it is shown, on the basis of a simple mean field approach to the dynamics of concentration and density fluctuations, that the interdiffusion coefficient D int(ϕ) in a blend (A/B) of composition ϕ can be related to the self-diffusion coefficients D*A/B of the pure melts. However, the relation is predicted to be a linear combination of the so-called fast and slow modes: D int −1 =(1−U){D slow * }−1+ U{D fast * }−1.

The parameter U=U(T) is given and is shown to be a measure of the nearness of the glass transition to the experimental temperature T. Far above the glass transition (U→0) the interdiffusion coefficient reduces to D*slow and should show the simple linear dependence on concentration according to {D slow * }−1={ϕD A * }−1+{(1−ϕ) D B * }.

Key words

Polymer blends interdiffusion glass transition 


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  1. 1.
    Binder K, Jilge W, Carmesin I, Kremer K (1990) Macromols 23:5001–5013CrossRefGoogle Scholar
  2. 2.
    de Gennes PG (1980) J Chem Phys 72:4756–4763CrossRefGoogle Scholar
  3. 3.
    Kramer E, Green P, Palmstrom C (1984) Polymer 25:473–480CrossRefGoogle Scholar
  4. 4.
    Sillescu H (1984) Markromol Chem Rapid Commun 5:519CrossRefGoogle Scholar
  5. 5.
    Brereton MG, Fischer EW, Fytas G, Murschall U (1987) J Chem Phys 86:5174–5180CrossRefGoogle Scholar
  6. 6.
    Fytas G (1987) Macromols 20:1430–1431CrossRefGoogle Scholar
  7. 7.
    Jones R, Klein J, Donald AM (1986) Nature 321:16–17Google Scholar
  8. 8.
    composto R, Mayer J, Kramer E, White D (1986) Phys Rev Letts 57:1312–1315CrossRefGoogle Scholar
  9. 9.
    Jordan A, Ball R, Donald AM, Fetters L, Jones A, Klein J (1988) Macromols 21:235–239CrossRefGoogle Scholar
  10. 10.
    Binder K, Sariban A, Deutsch H-P (1991) J Non Crystalline Solids 131:635–642CrossRefGoogle Scholar

Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1993

Authors and Affiliations

  • M. G. Brereton
    • 1
  1. 1.Dept. Physics IRC in Polymer Science and TechnologyUniversity of LeedsLeedsUK

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