TY  - JOUR
A1  - Fechner, Mabya
A1  - Koetz, Joachim
T1  - Potentiometric behavior of Polyampholytes based on N,N'-diallyl-N,N'-dimethylammonium chloride and maleamic acid derivatives
JF  - Macromolecular chemistry and physics
N2  - Strongly alternating copolymers (PalH, PalPh, PalPhBisCarb) composed of N,N'-diallyl-N,N'-dimethyl-ammonium chloride (DADMAC) and maleamic acid derivatives (MAD) are synthesized by a water-based free radical copolymerization using 4,4-azobis(4-cyanovaleric acid) (V501) as the initiator. The structure of the copolymers is verified by 1H-NMR, elemental analysis, and thermogravimetric measurements, and the physicochemical properties are investigated by viscometric and potentiometric techniques. Potentiometric titration curves show that the acidity of the carboxylic groups strongly depends on the degree of dissociation and the ionic strength. Since all copolymers behave as polycations at low degree of dissociation, a transition from an extended chain to a coil conformation can be identified by reaching the isoelectric point (IEP).
KW  - acidity constants
KW  - radical polymerization
KW  - polyampholytes
KW  - viscosity
KW  - conformational transitions
Y1  - 2011
U6  - https://doi.org/10.1002/macp.201100532
SN  - 1022-1352
VL  - 212
IS  - 24
SP  - 2691
EP  - 2699
PB  - Wiley-Blackwell
CY  - Malden
ER  -