Morphological behavior of ASB miktoarm star block copolymers

Frederick L. Beyer*, Samuel P. Gido, Gabriel Velis, Nikolaos Hadjichristidis, Nora Beck Tan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

A morphological study of three AsB, six-arm miktoarm star block copolymers is presented. The miktoarm stars are comprised of five arms of polyisoprene and one arm of polystyrene joined together at a single junction point. The strong segregation limit theory for the morphological behavior of miktoarm stars predicts that these materials should form cylindrical (two samples) and lamellar (one sample) morphologies, but only lamellar morphologies were observed by TEM and SAXS. These results are similar to previously reported discrepancies between miktoarm star morphological behavior and the predictions of the theory. Combining the data of this study with that of previous morphological studies of miktoarm star materials, we can track the increasing discrepancy between the experimentally observed morphology and theoretical predictions as the molecular asymmetry parameter, e, increases. The AsB materials in this study were also observed to form exceptionally well-ordered morphologies.

Original languageEnglish (US)
Pages (from-to)6604-6607
Number of pages4
JournalMacromolecules
Volume32
Issue number20
StatePublished - Oct 5 1999

ASJC Scopus subject areas

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

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