Early stages of phase separation from polydisperse polymer mixtures |
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Authors: | N Clarke |
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Institution: | (1) Department of Chemistry, University of Durham, Science Laboratories, South Road, Durham, DH1 3LE, UK, GB |
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Abstract: | We study the early stages of phase separation in a mixture of a polydisperse and a monodisperse polymer within the Cahn-Hilliard
framework. We model the polydisperse component using a finite, but arbitrarily large, number of components, and show that
the number of components required for convergent behaviour to be achieved is computationally undemanding. We study the growth
rate of fluctuations following a quench into the two-phase region of the phase diagram. The q-dependence of the growth rate is shown to be commensurate with the behaviour of a monodisperse-monodisperse mixture, with
the major difference being an effective mobility that is dependent on the quench depth. We also study the deviation of the
time dependence of the scattering function from single exponential behaviour.
Received 29 June 2000 and Received in final form 20 November 2000 |
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Keywords: | PACS 64 75 +g Solubility segregation and mixing phase separation – 61 41 +e Polymers elastomers and plastics |
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