Block and graft copolymers: III. Apparent dissociation constants of copolymers of acrylic acid and acrylamide

Abstract

The apparent dissociation constant of block, graft, and random copolymers of acrylamide and acrylic acid and of branched and linear polyacrylic acid has been measured by electrometric titrations in 0.1 N sodium chloride solution. Block copolymers have the same acid strength as linear homopolymers. Random copolymers are stronger acids than linear homopolymers, and graft and branched polymers are weaker acids. Reasons for the difference in apparent acid strength between branched and linear polyacrylic acids have been considered.