Theory of microphase separation in block copolymer solutions

M. De La Olvera Cruz*

*Corresponding author for this work

Research output: Contribution to journalArticle

60 Scopus citations

Abstract

Microphase separation in semidilute solutions of block copolymers in nonselective good solvent is analyzed. The swelling due to the presence of solvent is taken into account. The solvent effects on the thermodynamics in the disordered region and in the ordered region in the weak segregation limit are discussed. It is found that the concentration of block copolymer at the microphase separation transition scales as N-0.62 in good solvents and as N-1/2 in ⊖ solvents. In the asymptotic semidilute regime in good solvents, the coexistence curve at the microphase separation transition is negligible, and the transition scales as (χ′ AB φ1.61 N), ∼ constant, where the constant is determined by the relative composition of the blocks in the block copolymer and χ′AB is proportional to the usual Flory interaction parameter.

Original languageEnglish (US)
Pages (from-to)1995-2002
Number of pages8
JournalThe Journal of Chemical Physics
Volume90
Issue number3
StatePublished - Dec 1 1989

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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