Model nonlinear block copolymers: Synthesis, characterization, morphology

Nikolaos Hadjichristidis*, Y. Tselikas, H. Iatrou, V. Efstratiadis, A. Avgeropoylos

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The synthesis of well-defined, near monodisperse, nonlinear block copolymers of the A 2 B (3-miktoarm star copolymers), A 3 B (4-miktoarm star copolymers), (AB) 2 (BA) 2 (inversed 4-miktoarm star block copolymers), and A 3 BA 3 (bridged miktoarm star copolymers) types is described. A is polyisoprene (PI) and B is polystyrene (PS). The synthetic approach involves the reaction of methyltrichlorosilane or tetrachlorosilane with monofunctional or difunctional macroanions of B under conditions unfavorable to chain coupling or linking, followed by addition of the monofunctional macroanion A. Characterization was carried out by size exclusion chromatography, low-angle laser light scattering, laser differential refractometry, membrane and vapor pressure osmometry, and NMR and UV spectroscopy. Microphase separation was studied by transmission electron microscopy and small-angle x-ray scattering. Comparison with the corresponding linear block copolymers showed that the macromolecular architecture not only strongly affects the morphological domain borders but can introduce new morphologies as well.

Original languageEnglish (US)
Pages (from-to)1447-1457
Number of pages11
JournalJournal of Macromolecular Science - Pure and Applied Chemistry
Volume33
Issue number10
DOIs
StatePublished - Jan 1 1996

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Polymers and Plastics
  • Materials Chemistry

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