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Synthesis and characterization of hyperbranched cationic polyelectrolytes via aqueous self-condensing atom transfer radical polymerization

Authors

  • Jun Gao,

    1. Section of Soft Matter and Macromolecular Science, Key Laboratory of Polymeric Materials of Changzhou City, Department of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou 213164, China
    2. Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Fudan University, Shanghai 200433, China
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  • Guangqun Zhai,

    Corresponding author
    1. Section of Soft Matter and Macromolecular Science, Key Laboratory of Polymeric Materials of Changzhou City, Department of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou 213164, China
    2. Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Fudan University, Shanghai 200433, China
    • Section of Soft Matter and Macromolecular Science, Key Laboratory of Polymeric Materials of Changzhou City, Department of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou 213164, China
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  • Yan Song,

    1. Section of Soft Matter and Macromolecular Science, Key Laboratory of Polymeric Materials of Changzhou City, Department of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou 213164, China
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  • Bibiao Jiang

    1. Section of Soft Matter and Macromolecular Science, Key Laboratory of Polymeric Materials of Changzhou City, Department of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou 213164, China
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Abstract

The hyperbranched cationic polyelectrolytes (PDMEAB) were directly prepared via the CuBr/ligand-catalyzed (ligand = 2,2′-bipyridine or pentamethyldiethylenetriamine) aqueous self-condensing atom transfer radical polymerization (SCATRP) of a novel inimer, N,N-dimethyl-N-(2-methacryloyloxy)ethyl-N-(2-bromoisobutyryloxy)ethyl ammonium bromide (DMEAB). Elemental analysis and nuclear magnetic resonance (NMR) spectroscopy confirmed the structure of DMEAB. The hyperbranched architecture and number-average degree of polymerization (DPn) of the PDMEAB was studied by 1H- and 13C-NMR. The kinetic results suggested that the DPn of the hyperbranched PDMEAB grew gradually in the initial stage and exponentially in the later stage. The differential scanning calorimetry (DSC) showed that the glass transition temperature of the hyperbranched PDMEAB was much lower than that of the linear analogue. The solution rheometry showed that the aqueous PDMEAB solutions approximately underwent a Newtonian behavior and their shear viscosity maintained almost constant upon the addition of NaCl because of the spherical conformations of the hyperbranched cationic polyelectrolytes. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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