Micellization of miktoarm star SnIn copolymers in block copolymer/homopolymer blends

E. Pavlopoulou, S. H. Anastasiadis, H. Iatrou, M. Moshakou, Nikolaos Hadjichristidis, G. Portale, W. Bras

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Aseries of miktoarm (polystyrene)n(polyisoprene)n, SnIn, star-block copolymers, comprising n equal arms of polystyrene and n equal arms of polyisoprene, is utilized to investigate the effect of macromolecular architecture on the characteristics of the micelles formed by the copolymers in a polyisoprene homopolymer matrix at various concentrations 0.05-2 wt%. The characteristics of the micelles are studied with small-angle X-ray scattering (SAXS) as a function of the functionality of the star copolymer n. The radius of the micellar core is found to be independent of n, the aggregation number decreases with increasing n exhibiting a n -1 power law dependence, while the volume fraction of copolymer chains participating in micelles is constant; these imply that the junction point of the copolymer does not affect the micellization process in any significant way. A simple thermodynamic model is developed following the methodology of Leibler in order to describe theoretically the micellization of AnBn copolymers in a B homopolymer matrix. The predictions of the model are in quantitative agreement with the experimental results, thus signifying that the assumptions of the simple model are valid.

Original languageEnglish (US)
Pages (from-to)5285-5295
Number of pages11
JournalMacromolecules
Volume42
Issue number14
DOIs
StatePublished - Jul 28 2009

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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