Filler-Induced Composition Waves in Phase-Separating Polymer Blends

Published

November 1, 1999

Author(s)

B P. Lee, Jack F. Douglas, S C. Glotzer

Abstract

The influence of a dilute concentration of filler particles on polymer blend phase separation is investigated computationally using a generalization of the Cahn-Hilliard-Cook (CHC) theory to include model filler particles (spheres, fibers, platelets). 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** composition patterns are overtaken in late stage phase separation by a growing **background** spinodal pattern characteristic of blend films without filler particles. The linearized CHC model is used to estimate the number of composition oscillations centered about the additive particles. In far-off-critical composition blends, an **encapsulation layer** grows at the interface of the filler rather than a target pattern. The results of these simulations compare favorably with experiments on filled phase separating blends.

Citation

Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)

Volume

60

Issue

No. 5

Pub Type

Journals

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Keywords

filler, phase separation blends, spinodal decomposition, target patterns

Citation

Lee, B. , Douglas, J. and Glotzer, S. (1999), Filler-Induced Composition Waves in Phase-Separating Polymer Blends, Physical Review E (Statistical, Nonlinear, and Soft Matter Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=851584 (Accessed December 30, 2024)