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

Handle URI:
http://hdl.handle.net/10754/563439
Title:
Phosphazene-promoted metal-free ring-opening polymerization of ethylene oxide initiated by carboxylic acid
Authors:
Zhao, Junpeng; Pahovnik, David; Gnanou, Yves ( 0000-0001-6253-7856 ) ; Hadjichristidis, Nikolaos ( 0000-0003-1442-1714 )
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.
KAUST Department:
KAUST Catalysis Center (KCC); Physical Sciences and Engineering (PSE) Division; Polymer Synthesis Laboratory; Chemical Science Program
Publisher:
American Chemical Society (ACS)
Journal:
Macromolecules
Issue Date:
11-Mar-2014
DOI:
10.1021/ma500067j
Type:
Article
ISSN:
00249297
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorZhao, Junpengen
dc.contributor.authorPahovnik, Daviden
dc.contributor.authorGnanou, Yvesen
dc.contributor.authorHadjichristidis, Nikolaosen
dc.date.accessioned2015-08-03T11:51:30Zen
dc.date.available2015-08-03T11:51:30Zen
dc.date.issued2014-03-11en
dc.identifier.issn00249297en
dc.identifier.doi10.1021/ma500067jen
dc.identifier.urihttp://hdl.handle.net/10754/563439en
dc.description.abstractThe 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.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titlePhosphazene-promoted metal-free ring-opening polymerization of ethylene oxide initiated by carboxylic aciden
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentPolymer Synthesis Laboratoryen
dc.contributor.departmentChemical Science Programen
dc.identifier.journalMacromoleculesen
kaust.authorGnanou, Yvesen
All Items in KAUST are protected by copyright, with all rights reserved, unless otherwise indicated.