On the Mechanism of Pinning in Phase-Separating Polymer Blends

Details On the Mechanism of Pinning in Phase-Separating Polymer Blends On the Mechanism of Pinning in Phase-Separating Polymer Blends

1995-08-25

arxiv.org/abs/cond-mat/9508122v1

Physics

Condensed Matter

20 pages, latex, 4 uuencoded figures. Accepted for publication in J. Chem. Phys

Scientific paper

10.1063/1.469996

We re-explore the kinetics of spinodal decomposition in off-critical polymer blends through numerical simulations of the Cahn-Hilliard equation with the Flory-Huggins-De Gennes free energy functional. Even in the absence of thermal noise, the solution of the discretized equation of motion shows coarsening in the late stages of spinodal decomposition without evidence of pinning, regardless of the relative concentration of the blend components. This suggests this free energy functional is not sufficient to describe the physics responsible for pinning in real blends.

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