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Undulated cylinders of charged diblock copolymers.

Authors
  • Grason, G M
  • Santangelo, C D
Type
Published Article
Journal
The European physical journal. E, Soft matter
Publication Date
Jul 01, 2006
Volume
20
Issue
3
Pages
335–346
Identifiers
PMID: 16871367
Source
Medline
License
Unknown

Abstract

We study the cylinder to sphere morphological transition of diblock copolymers in aqueous solution with a hydrophobic block and a charged block. We find a metastable undulated cylinder configuration for a range of charge and salt concentrations which, nevertheless, occurs above the threshold where spheres are thermodynamically favorable. By modeling the shape of the cylinder ends, we find that the free-energy barrier for the transition from cylinders to spheres is quite large and that this barrier falls significantly in the limit of high polymer charge and low solution salinity. This suggests that observed undulated cylinder phases are kinetically trapped structures.

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