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

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    Type
    Article
    Authors
    Zhao, Junpeng cc
    Pahovnik, David
    Gnanou, Yves cc
    Hadjichristidis, Nikos cc
    KAUST Department
    Chemical Science Program
    KAUST Catalysis Center (KCC)
    Physical Science and Engineering (PSE) Division
    Polymer Synthesis Laboratory
    Date
    2014-02-21
    Online Publication Date
    2014-02-21
    Print Publication Date
    2014-03-11
    Permanent link to this record
    http://hdl.handle.net/10754/563439
    
    Metadata
    Show full item record
    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.
    Citation
    Zhao, J., Pahovnik, D., Gnanou, Y., & Hadjichristidis, N. (2014). Phosphazene-Promoted Metal-Free Ring-Opening Polymerization of Ethylene Oxide Initiated by Carboxylic Acid. Macromolecules, 47(5), 1693–1698. doi:10.1021/ma500067j
    Publisher
    American Chemical Society (ACS)
    Journal
    Macromolecules
    DOI
    10.1021/ma500067j
    ae974a485f413a2113503eed53cd6c53
    10.1021/ma500067j
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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