Double periodic lamellar-in-lamellar structure in multiblock copolymer melts with competing length scales

Rikkert Nap, Nazar Sushko, Igor Erukhimovich, Gerrit ten Brinke*

*Corresponding author for this work

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Abstract

The results of a detailed theoretical investigation of the phase behavior of A(m)-b-(B-b-A)(n) multiblock copolymer melts are presented for the special case of m = 20 and n = 10. The presence of two strongly different molecular length scales results in the formation of a large-length-scale lamellar structure of alternating A(20) and (B-b-A)(10) layers on cooling. On further cooling, the (B-b-A)(10) layers subsequently transform internally into small-length-scale layers of the A and B blocks: a lamellar-in-lamellar morphology. The final structure consists of an alternation of one "thick" layer and seven "thin" layers and compares favorably with recent experimental results of Matsushita and co-workers on slightly different systems.

Original languageEnglish
Pages (from-to)6765-6770
Number of pages6
JournalMacromolecules
Volume39
Issue number19
DOIs
Publication statusPublished - 19-Sep-2006

Keywords

  • SUPRAMOLECULAR POLYMERIC MATERIALS
  • CONSISTENT-FIELD THEORY
  • TRIBLOCK COPOLYMERS
  • BLOCK-COPOLYMERS
  • COMPLEX FLUIDS
  • MORPHOLOGIES
  • CONVERGENCE
  • BEHAVIOR
  • DOMAINS

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