Synthesis and micellization of star-shaped poly(ethylene glycol)-block-poly(ε-caprolactone)

Keon Hyeong Kim, Guo Hua Cui, Hyung Jun Lim, June Huh, Cheol Hee Ahn, Won Ho Jo

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

The relationship between the architecture of block copolymers and their micellar properties was investigated. Diblock, 3-arm star-shaped and 4-arm star-shaped block copolymers based on poly(ethylene glycol) and poly (ε-caprolactone) were synthesized. Micelles of star-shaped block copolymer in an aqueous solution were then prepared by a solvent evaporation method. The critical micelle concentration and the size of the micelles were measured by the steady-state pyrene fluorescence method and dynamic light scattering, respectively. The CMC decreased in the order di-,3-arm star-shaped and 4-arm star-shaped block copolymer. The size of the micelles increased in the same order as the CMC. Theory also predicts that the formation of micelles becomes easier for 4-arm star-shaped block copolymers than for di- and 3-arm star-shaped block copolymers, which qualitatively agrees with the experiments.

Original languageEnglish
Pages (from-to)1684-1692
Number of pages9
JournalMacromolecular Chemistry and Physics
Volume205
Issue number12
DOIs
Publication statusPublished - 2004 Aug 12
Externally publishedYes

Keywords

  • Block copolymers
  • Micelles
  • PCL
  • PEG
  • Star polymers

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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