Micellar behavior of polystyrene-poly(ethylene oxide) diblock copolymers in aqueous media: Effect of copolymer composition, temperature, salt, and surfactants

Tejas Patel*, Ludmila Abezgauz, Dganit Danino, Vinod Aswal, Pratap Bahadur

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Formation and structure of micelles from two amphiphilic polystyrene-block-poly(ethylene oxide) (PS-PEO) diblock copolymers (PS mol.wt. 1000; PEO mol.wt. 3000 and 5000) were examined by surface tension, viscosity, steady state fluorescence, dynamic light scattering (DLS), small angle neutron scattering (SANS), and cryo-transmission electron microscopy (cryo-TEM). The critical micelle concentration (CMC) of the copolymers in aqueous solution was ca. 0.05%; micelle hydrodynamic diameter was 30-35 nm with a narrow size distribution. SANS studies show that the copolymers form ellipsoidal micelles with semi major axis ~23 nm and semi minor axis ~8 nm. No significant change in the structure was found with temperature and presence of salt. The copolymer micelles interaction with the ionic surfactants sodium dodecyl sulphate (SDS) and dodecyltrimethylammonium bromide (DTAB) was also examined by DLS and SANS.

Original languageEnglish
Pages (from-to)1083-1091
Number of pages9
JournalJournal of Dispersion Science and Technology
Volume32
Issue number8
DOIs
StatePublished - Aug 2011
Externally publishedYes

Keywords

  • Diblock copolymer
  • Micellization
  • Polystyrene-block-poly(ethylene oxide)
  • SANS

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