Effect of end-group sticking energy on the properties of polymer brushes: Comparing experiment and theory

S. Titmuss*, W. H. Briscoe, I. E. Dunlop, G. Sakellariou, Nikolaos Hadjichristidis, J. Klein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Using surface force balance measurements we have established that polystyrene chains bearing three zwitterionic groups have a higher end-group sticking energy than equivalent chains bearing a single zwitterionic group. In a good solvent, polystyrene chains end-functionalized with three zwitterionic groups form brushes of a higher surface coverage than those bearing a single zwitterion. The increase in surface coverage is slow compared with the initial formation of the brush. Measurements of the refractive index allow us to directly quantify the variation of surface coverage, permitting comparison with models for the kinetics of brush formation based on scaling theory and an analytical self-consistent field. We find qualitative support for associating the kinetic barrier with the energy required for an incoming chain to stretch as it penetrates the existing brush.

Original languageEnglish (US)
Article number12
Pages (from-to)11408-11419
Number of pages12
JournalJournal of Chemical Physics
Volume121
Issue number22
DOIs
StatePublished - Dec 8 2004

ASJC Scopus subject areas

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

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