Phosphazene-promoted metal-free ring-opening polymerization of ethylene oxide initiated by carboxylic acid

Junpeng Zhao, David Pahovnik, Yves Gnanou, Nikos Hadjichristidis

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

Abstract

The effectiveness of carboxylic acid as initiator for the anionic ring-opening polymerization of ethylene oxide was investigated with a strong phosphazene base (t-BuP4) used as promoter. Kinetic study showed an induction period, i.e., transformation of carboxylic acid to hydroxyl ester, followed by slow chain growth together with simultaneous and fast end-group transesterification, which led to poly(ethylene oxide) (PEO) consisting of monoester (monohydroxyl), diester, and dihydroxyl species. An appropriate t-BuP4/acid ratio was proven to be essential to achieve better control over the polymerization and low dispersity of PEO. This work provides important information and enriches the toolbox for macromolecular and biomolecular engineering with protic initiating sites. © 2014 American Chemical Society.
Original languageEnglish (US)
Pages (from-to)1693-1698
Number of pages6
JournalMacromolecules
Volume47
Issue number5
DOIs
StatePublished - Feb 21 2014

ASJC Scopus subject areas

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

Fingerprint

Dive into the research topics of 'Phosphazene-promoted metal-free ring-opening polymerization of ethylene oxide initiated by carboxylic acid'. Together they form a unique fingerprint.

Cite this