Controlled dispersion and precipitation of carbon black by a pH-responsive polyampholyte containing amino groups and aryl sulfonates

A pH-responsive polyampholyte based on poly(acrylamide-co-vinylamine) oligomer and an aryl sulfonate derivative was used for aqueous carbon black (CB) dispersion. The results showed that the obtained CB dispersion is very stable. Reversible dispersion and precipitation of the prepared CB dispersion can be achieved by pH changes.