Scaling of domain spacing in concentrated solutions of block copolymers in selective solvents

Chiajen Lai, William B. Russel, Richard A. Register

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

The dependence of block copolymer interdomain spacing d on polymer volume fraction φP in solution, d ∼ φP, is examined through a series of styrene-isoprene dibiock copolymers in four solvents, three of them strongly selective (nonsolvents for polystyrene). The exponent β is found to depend on solvent selectivity (both temperature and chemical identity of solvent; β increases with selectivity), on mesophase (β is largest when the insoluble blocks form lamellae, then cylinders, then spheres), and on diblock composition within a given mesophase (β is largest when the soluble blocks are most highly diluted). Values of β as large as unity are observed, indicating that selective solvents can swell d quite substantially over the value for the bulk diblock. In one example, a 2.5-fold increase in d is obtained when a cylinder-forming polystyrene-rich diblock is diluted into its mirror-image polystyrene-poor cylindrical mesophase.

Original languageEnglish (US)
Pages (from-to)4044-4049
Number of pages6
JournalMacromolecules
Volume35
Issue number10
DOIs
StatePublished - May 7 2002

All Science Journal Classification (ASJC) codes

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

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