Shaikh A. Ali, N. Y. Abu-Thabit and Hasan A. Al-Muallem Synthesis and solution properties of a pH-responsive cyclopolymer of zwitterionic ethyl 3-(N,N-diallylammonio)propanephosphonate Journal of Polymer Science Part A: Polymer Chemistry 48
A pH-responsive polyphosphonobetaine (PPB) containing a three carbon spacer between the charges has been synthesized for the first time using Butler's cyclopolymerization process. The unquenched valency of nitrogens in the zwitterionic units has permitted us to study the anionic polyeletrolyte (APP) - to - polyzwitterion transitions by viscometry and potentiometry. Contrary to known polycarbo- and sulfo-betaines, the PPB demonstrated contrasting solution behaviors in the presence of added salts. The basicity constants of the pH-triggerable amine and phonate functionalities have been determined.
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