194. Mori, H.; Walther, A.; André, X.; Lanzendörfer, M.; Müller, A.H.E.: Synthesis of Highly Branched Cationic Polyelectrolytes via Self-Condensing Atom Transfer Radical Copolymerization with 2-(Diethylamino)ethyl Methacrylate, Macromolecules 37, 2054 (2004) | |
Abstract: Randomly branched (arborescent) cationic polyelectrolytes were
synthesized by self-condensing vinyl copolymerization (SCVCP) of a
methacrylic AB* inimer, 2-(2-bromoisobutyryloxy)ethyl methacrylate
(BIEM), with (diethylamino)ethyl methacrylate (DEAEMA) via atom
transfer radical polymerization (ATRP), followed by quaternization.
Homopolymerization of DEAEMA with the
CuBr/hexamethyltriethylenetetramine (HMTETA) catalyst system gave a
linear polymer having controlled molecular weights and narrow molecular
weight distribution, which were evaluated by conventional GPC,
GPC-viscosity, and MALDI-TOF mass spectrometry. The catalyst system
could be applied to self-condensing vinyl polymerization (homo-SCVP) of
BIEM in bulk and in solution to provide hyperbranched architectures, as
confirmed by 1H and 13C NMR and GPC-viscosity
measurements. SCVCP with CuBr/HMTETA in solution gave a series of
tertiary amine methacrylate-based branched polymers, in which the
molecular weights, the composition of the DEAEMA segment, and the
branched structure can be adjusted by an appropriate choice of the
comonomer composition, |