Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1999-06-08
Phys. Rev. E 60, 5812 (1999)
Physics
Condensed Matter
Statistical Mechanics
13 pages, revtex, 12 eps figures
Scientific paper
10.1103/PhysRevE.60.5812
The influence of immobile filler particles (spheres, fibers, platelets) on polymer blend phase separation is investigated computationally using a generalization of the Cahn-Hilliard-Cook (CHC) model. Simulation shows that the selective affinity of one of the polymers for the filler surface leads to the development of concentration waves about the filler particles at an early stage of phase separation in near critical composition blends. These "target" patterns are overtaken in late stage phase separation by a growing "background" spinodal pattern characteristic of blends without filler particles. The linearized CHC model is used to estimate the number of composition oscillations emanating from isolated filler particles. In far-off-critical composition blends, an "encapsulation layer" grows at the surface of the filler rather than a target pattern. The results of these simulations compare favorably with experiments on filled phase separating blend films.
Douglas* Jack F.
Glotzer Sharon C.
Lee Benjamin P.
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