Block copolymers with zwitterionic groups at specific sites: synthesis and aggregation behavior in dilute solutions

Stergios Pispas, Nikolaos Hadjichristidis

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Well-defined linear diblock and triblock copolymers of styrene and isoprene, nearly symmetric in composition, with one or two sulfobetaine associogenic groups at the ends of the polymer chain or the junction points between blocks, were synthesized by anionic polymerization high-vacuum techniques. The synthetic strategy used the combined initiation of polymerization with 3-dimethylaminopropyllithium, living end-capping with 1-(4-dimethylaminophenyl)-1-phenylethylene, and postpolymerization reaction with cyclopropanesultone. The association behavior of these macromolecules in dilute solutions in the nonpolar solvent CCl4, good for both blocks, was studied by a number of methods, including static and dynamic light scattering and viscometry. The number and position of the associogenic groups dramatically influenced the association behavior of these model block copolymers. The end-functionalized samples formed larger aggregates than the junction-point-functionalized ones. The difference was attributed to stronger excluded volume effects when the zwitterion group was located within the chain than when the group was at the chain end(s).

Original languageEnglish (US)
Pages (from-to)3791-3801
Number of pages11
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume38
Issue number20
DOIs
StatePublished - Oct 15 2000

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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