Effect of molecular architecture on micellization, drug loading and releasing of multi-armed poly(ethylene glycol)-b-poly(ε-caprolactone) star polymers

Hyung Jun Lim, Hyunsuk Lee, Keon Hyeong Kim, June Huh, Cheol Hee Ahn, Jin Woong Kim

Research output: Contribution to journalArticle

14 Citations (Scopus)


This study investigated the effect of molecular architecture of amphiphilic star polymers on micelle formation and drug loading and releasing. For this, multi-armed star block copolymers having poly(ethylene glycol) as a hydrophilic block and poly(ε-caprolactone) as a hydrophobic block were synthesized by using a divergent synthetic method consisting of a coupling reaction and a ring opening polymerization. The molecular weight and molecular weight distribution of the block copolymers were characterized by 1H NMR and GPC measurements. Dynamic light scattering and fluorescence spectroscopic analysis were employed to observe micellization, drug loading, and drug release behaviors. We have figured out that the number of arms is a critical factor that changes critical micelle concentration as well as drug loading and releasing behaviors; increase in the number of arms not only led to lowering the critical micelle concentration and drug release rate but also increased the micelle size and drug loading efficiency.

Original languageEnglish
Pages (from-to)1817-1827
Number of pages11
JournalColloid and Polymer Science
Issue number8
Publication statusPublished - 2013 Aug 1



  • Drug loading
  • Drug releasing
  • Molecular architecture
  • Polymeric micelle
  • Star polymers

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry

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