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Issue 19, 2018
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Anionic polymerization of activated oxetane and its copolymerization with ethylene oxide for the synthesis of amphiphilic block copolymers

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Abstract

The synthesis of polyoxetane (POx) and amphiphilic block copolymers composed of poly(ethylene oxide) (PEO) and polyoxetane was achieved by anionic ring-opening polymerization and monomer activation. First the anionic polymerization of oxetane was conducted using an initiating system based on tetraoctylammonium bromide associated with a simple trialkylaluminum, NOct4Br/i-Bu3Al (1/>1). This methodology allowed the controlled synthesis of polyoxetanes with molar masses up to 10 000 g mol−1 and a narrow molar mass distribution (Đ < 1.2). The synthesis of diblock copolymers was achieved starting from a mixture of ethylene oxide and oxetane, thanks to their difference in reactivity. The micellization of PEO-b-POx in water was studied as a function of temperature with a shrinking phenomenon appearing at around 33 °C. Finally, a two-step procedure is also discussed for the synthesis of polyoxetane-b-poly(ethylene oxide)-b-polyoxetane triblock copolymer.

Graphical abstract: Anionic polymerization of activated oxetane and its copolymerization with ethylene oxide for the synthesis of amphiphilic block copolymers

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Publication details

The article was received on 22 Feb 2018, accepted on 17 Apr 2018 and first published on 25 Apr 2018


Article type: Paper
DOI: 10.1039/C8PY00307F
Citation: Polym. Chem., 2018,9, 2660-2668
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    Anionic polymerization of activated oxetane and its copolymerization with ethylene oxide for the synthesis of amphiphilic block copolymers

    M. Gervais, A. Forens, E. Ibarboure and S. Carlotti, Polym. Chem., 2018, 9, 2660
    DOI: 10.1039/C8PY00307F

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