• hyperbranched cationic polyelectrolyte;
  • inimer;
  • self-condensing atom transfer radical polymerization


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