SYNTHESIS AND CHARACTERISTICS OF THE POLY(CARBOXYBETAINE)S AND THE CORRESPONDING CATIONIC POLYMERS

Two types of carboxybetaines and their corresponding cationic monomers and polymers are synthesized in this study. Comparing the chemical sh ifts of the methylene groups in the cationic monomers and carboxybetai nes in both H-1- and C-13-NMR spectra reveal that the respective methy lene groups are clearly distinguished from their chemical shifts in H- 1- and C-13-NMR spectra. The solubilities, moisture regain properties, and solution properties of the poly(carboxybetaine)s and cationic pol ymers are investigated in relation to their molecular structures. Beca use the cationic polymers were ionized in an aqueous solution, the cat ionic polymers were more soluble than the poly(carboxybetaine). For th e various functional groups of poly(carboxybetaine)s and cationic poly mers, the order of tendency for moisture regain is -COO- > -CONH-. Res ults obtained from the reduced viscosity for cationic poly(TMMPAMS) ar e reversed from that for zwitterionic poly(DMAEAPL). (C) 1997 John Wil ey & Sons, Inc.