Random copolymers in concentrated solutions

B. W. Swift*, M. Olvera De La Cruz

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

We study concentrated solutions of ideal A-B symmetric random copolymers in non-selective good solvents by computer simulations. When the effective net A-B interaction per thermal energy in the solution (χeff) is larger than 2, the scattering function has a peak at a molecular weight (N) independent wave vector k* ≠ 0. We find a certain characteristic cell size l < 1/k* below which the distribution of local monomer densities within the system is flat, i.e. the probability of finding a cell with an A monomer density ρA is uniform over a broad range of ρA values. We observe solvent enrichment in cells where ρA ∼ ρB and solvent depletion in cells which are either A or B rich. The chains dynamics for all N studied (up to N = 64) are Rouse-like regardless of the value of χeff. When reptation dynamics are imposed, the diffusion of the center of mass decreases substantially as χeff increases, suggesting that long chains are quasi-frozen.

Original languageEnglish (US)
Pages (from-to)487-492
Number of pages6
JournalEurophysics Letters
Volume35
Issue number7
DOIs
StatePublished - Sep 1 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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