Relationship between pH and viscosity of poly(4-vinylpyrimidine N-oxide) in aqueous solution

Abstract

The synthesis and viscosity/pH relationship in aqueous solution of poly(4-vinylpyrimidine N-oxide) are described. Below pH 4 viscosity increases sharply. Above pH 4 viscosity rises to a maximum at about pH 7.5, then decreases to a minimum at about pH 10. The viscosity/pH curve is a combination of the curves corresponding to poly(2-vinylpyridine 1-oxide) and poly(4-vinylpyridine 1-oxide).