Amphiphilic diblock copolymers based on poly(2-ethyl-2-oxazoline) and poly(1,3-trimethylene carbonate): Synthesis and micellar characteristics

Chulhee Kim, Sang Cheon Lee, Jung Han Shin, Jin San Yoon, Ick Chan Kwon, Seo Young Jeong

Research output: Contribution to journalArticle

89 Citations (Scopus)

Abstract

Amphiphilic diblock copolymers with various block compositions were synthesized on the basis of poly(2-ethyl-2-oxazoline) (PEtOz) as a hydrophilic block and poly(1,3-trimethylene carbonate) (PTMC) as a hydrophobic block. Their aqueous solutions were characterized using fluorescence techniques and dynamic light scattering. The block copolymers formed micelles with critical micelle concentrations (cmc's) in the range 2.8-25 mg/L in an aqueous phase. As the length of the hydrophobic PTMC block became longer, lower cmc values were generated. The mean diameters of the micelles were in the range 199-210 nm, with a narrow distribution. The partition equilibrium constants (Kv) of pyrene in the micellar solutions of the block copolymers were 0.91×105-1.61×105. The Kv value increased as the length of the hydrophobic block increased. The steady-state fluorescence anisotropy values (r) of 1,6-diphenyl-1,3,5-hexatriene (DPH) in PEtOz-PTMC solutions were 0.292-0.302. The anisotropy values were not significantly influenced by the length of the hydrophobic block. The micelles underwent hydrogen bonding at pH<3.6 with poly(acrylic acid) resulting in polymer complex precipitates, which could be reversibly dispersed as micelles at pH>3.9.

Original languageEnglish
Pages (from-to)7448-7452
Number of pages5
JournalMacromolecules
Volume33
Issue number20
DOIs
Publication statusPublished - 2000 Oct 3

ASJC Scopus subject areas

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

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