Effects of polydispersity on the order-disorder transition of diblock copolymer melts |
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Authors: | T M Beardsley M W Matsen |
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Institution: | (1) Department of Mathematics, University of Reading, RG6 6AX Reading, Whiteknights, UK |
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Abstract: | The effect of polydispersity on an AB diblock copolymer melt is investigated using lattice-based Monte Carlo simulations.
We consider melts of symmetric composition, where the B blocks are monodisperse and the A blocks are polydisperse with a Schultz-Zimm
distribution. In agreement with experiment and self-consistent field theory (SCFT), we find that polydispersity causes a significant
increase in domain size. It also induces a transition from flat to curved interfaces, with the polydisperse blocks residing
on the inside of the interfacial curvature. Most importantly, the simulations show a relatively small shift in the order-disorder
transition (ODT) in agreement with experiment, whereas SCFT incorrectly predicts a sizable shift towards higher temperatures. |
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Keywords: | PACS" target="_blank">PACS 82 35 Jk Copolymers phase transitions structure 61 46 -w Structure of nanoscale materials |
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