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

Junpeng Zhao; David Pahovnik; Yves Gnanou; Nikos Hadjichristidis

doi:10.1021/ma500067j

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 journal › Article › peer-review

69 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 language	English (US)
Pages (from-to)	1693-1698
Number of pages	6
Journal	Macromolecules
Volume	47
Issue number	5
DOIs	https://doi.org/10.1021/ma500067j
State	Published - Feb 21 2014

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01

ASJC Scopus subject areas

Materials Chemistry
Organic Chemistry
Polymers and Plastics
Inorganic Chemistry

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title = "Phosphazene-promoted metal-free ring-opening polymerization of ethylene oxide initiated by carboxylic acid",

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. {\textcopyright} 2014 American Chemical Society.",

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T1 - Phosphazene-promoted metal-free ring-opening polymerization of ethylene oxide initiated by carboxylic acid

AU - Zhao, Junpeng

AU - Pahovnik, David

AU - Gnanou, Yves

AU - Hadjichristidis, Nikos

N1 - KAUST Repository Item: Exported on 2020-10-01

PY - 2014/2/21

Y1 - 2014/2/21

N2 - 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.

AB - 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.

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JO - Macromolecules

JF - Macromolecules

IS - 5

ER -

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

Abstract

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ASJC Scopus subject areas

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