Selectively swollen films of triblock/diblock copolymer blends: Dependence of swollen film structure on blend composition

Rastislav Levicky, Nagraj Koneripalli, Matthew Tirrell, John F. Ankner, Helmut Kaiser, Sushil K. Satija

Research output: Contribution to journalArticle

Abstract

Compositional variation in blends of triblock and diblock copolymer films can be used to adjust the film response to a selective solvent. We investigated the relationship between blend composition and film structure in ordered films containing poly(styrene-b-2-vinylpyridine) (PS-P2VP) diblocks and PS-P2VP-PS triblocks. The study focuses on films possessing a lamellar morphology. Methanol, a strongly selective solvent for P2VP, is used to swell the films. Since methanol solvates P2VP but not PS, periodic multilayer structures result in which solvent-rich P2VP domains are separated by undissolved PS domains. The film structure is characterized in the dry and swollen states with neutron reflectivity. Although the dry state morphology dimensions are practically identical for all samples, in the swollen state films richer in triblock swell less due to higher density of bridges interconnecting the PS domains. Furthermore, in swollen triblock-containing samples, polymer concentration variations in P2VP domains are suppressed and the PS domains are better aligned with respect to the substrate.

Original languageEnglish (US)
Pages (from-to)4908-4914
Number of pages7
JournalMacromolecules
Volume31
Issue number15
DOIs
StatePublished - Jul 28 1998

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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