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Dynamics of compatible polymer mixtures

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  • Brochard, F.
  • de Gennes, P.G.

Abstract

We discuss the mutual diffusion of a compatible molten mixture A + B assuming that the chains are flexible and relatively short (non-entangled). In the macroscopic limit the mutual diffusion coefficient Dm is predicted to be extremely large (independent of the molecular weights). When we go to shorter wave vectors q two cross-overs occur: 1.a) when the frequency Dmq2 becomes larger than the fundamental Rouse time TR of a single chain, the coefficient Dm becomes q dependent, Dm → Dm(q) ∼ q2;2.b) when the spatial scales become smaller than the coil size R0 (qR0 1) the width Dm(q)q2 becomes independent of q, and is comparable to a local relaxation rate.

Suggested Citation

  • Brochard, F. & de Gennes, P.G., 1983. "Dynamics of compatible polymer mixtures," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 118(1), pages 289-299.
    • Handle: RePEc:eee:phsmap:v:118:y:1983:i:1:p:289-299
    DOI: 10.1016/0378-4371(83)90195-4
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