Segregation of block copolymers to interfaces between immiscible homopolymers

Kenneth R. Shull*, Edward J. Kramer, Georges Hadziioannou, Wing Tang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

244 Scopus citations

Abstract

The equilibrium segregation of deuterated polystyrene–poly(2-vinylpyridine) diblock copolymers to interfaces between high molecular weight polystyrene and poly(2-vinylpyridine) homopolymers was measured by forward recoil spectrometry. The dependence of the integrated segregation on the equilibrium copolymer concentration in the PS phase is compared to predictions from a mean-field theory in which the copolymer chemical potential is the relevant parameter. Predictions from the theory are quantitatively accurate for values of the copolymer chemical potential, which are below a certain limiting value associated with the formation of block copolymer micelles. The segregation behavior in the regime where micelles are present is complicated by a strong tendency for micelles to segregate to the free polystyrene surface and by a weaker tendency for micelles to segregate to the interfacial region. Values of the copolymer chemical potential at the micelle transition are obtained from a careful analysis of the data and are in reasonable agreement with predictions from a simplified theory of micelle formation.

Original languageEnglish (US)
Pages (from-to)4780-4787
Number of pages8
JournalMacromolecules
Volume23
Issue number22
DOIs
StatePublished - Jan 1 1990

ASJC Scopus subject areas

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

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