Synthesis and self-association behavior of poly[bis(2-(2-methoxyethoxy) ethoxy)phosphazene]-b-poly(propylene glycol) triblock copolymers

Youngkyu Chang, Song Yun Cho, Lee B. Steely, Harry R. Allcock

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Amphilic triblock copolymers with varying ratios of hydrophilic poly[bis (methoxyethoxyethoxy)phosphazene] (MEEP) and relatively hydrophobic poly(propylene glycol) (PPG) blocks were synthesized via the controlled cationic-induced living polymerization of a phosphoranimine (Cl 3P=NSiMe 3) at ambient temperature. A PPG block can function as either a classical hydrophobic block or a less hydrophobic component by varying the nature of a phosphazene block. The aqueous phase behavior of MEEP-PPG-MEEP block copolymers was investigated using fluorescence techniques, TEM, and dynamic light scattering (DLS). The critical micelle concentrations (cmcs) of MEEP-PPG-MEEP block copolymers were determined to be in the range of 3.7-16.8 mg/L. The mean diameters of MEEP-PPG-MEEP polymeric micelles, measured by DLS, were between 31 and 44 nm. The equilibrium constants of pyrene in these micelles ranged from 4.7 × 10 4 to 9.6 × 10 4.

Original languageEnglish (US)
Pages (from-to)692-699
Number of pages8
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume47
Issue number3
DOIs
StatePublished - Feb 1 2009

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All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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