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A “Catalyst Switch” Strategy for the Sequential Metal-Free Polymerization of Epoxides and Cyclic Esters/Carbonate

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    A “Catalyst Switch” Strategy for the Sequential Metal-Free Polymerization of Epoxides and Cyclic Esters/Carbonate
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    † †Physical Sciences and Engineering Division and ‡Physical Sciences and Engineering Division, KAUST Catalysis Center, Polymer Synthesis Laboratory, King Abdullah University of Science and Technology (KAUST), Thuwal 23955, Saudi Arabia
    *(N.H.) E-mail: [email protected]
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    Macromolecules

    Cite this: Macromolecules 2014, 47, 12, 3814–3822
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    https://doi.org/10.1021/ma500830v
    Published June 3, 2014
    Copyright © 2014 American Chemical Society
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    Abstract

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    A “catalyst switch” strategy was used to synthesize well-defined polyether–polyester/polycarbonate block copolymers. Epoxides (ethylene oxide and/or 1,2-butylene oxide) were first polymerized from a monoalcohol in the presence of a strong phosphazene base promoter (t-BuP4). Then an excess of diphenyl phosphate (DPP) was introduced, followed by the addition and polymerization of a cyclic ester (ε-caprolactone or δ-valerolactone) or a cyclic carbonate (trimethylene carbonate), where DPP acted as both the neutralizer of phosphazenium alkoxide (polyether chain end) and the activator of cyclic ester/carbonate. This work has provided a one-pot sequential polymerization method for the metal-free synthesis of block copolymers from monomers which are suited for different types of organic catalysts.

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    Additional 1H NMR and MALDI–TOF MS spectra, dependence of conversion plots, SEC traces, kinetic plots. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Macromolecules

    Cite this: Macromolecules 2014, 47, 12, 3814–3822
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    https://doi.org/10.1021/ma500830v
    Published June 3, 2014
    Copyright © 2014 American Chemical Society
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