Abstract
An amphoteric water-soluble copolymer, i.e., polyacrylamide/(α- N, N-dimethyl- N-(3-(β-carboxylate)acrylamino)propyl) ammonium ethanate (PAM/DAE) was synthesized and used as a dispersion agent for BaTi 4O 9/Ba 2Ti 9O 20 (BT 4/B 2T 9) particles. PAM/DAE was prepared from acrylamide and (α- N, N-dimethyl- N-(3-(β-carboxylate)acrylamino)propyl) ammonium ethanate in a basic condition through a free radical polymerization. The dispersing property of this copolymer was examined by means of rheology, particle size, and leached Ba 2+ concentration measurements. The results indicate that PAM/DAE could reduce the viscosity of slurries greatly, and cause BT 4/B 2T 9 particle sizes a shift to smaller values. Compared with a commercial dispersant, ammonium salt of poly(methacrylic acid) (PMAA–NH 4), PAM/DAE is as effective in preparing dispersed suspensions. More importantly, PAM/DAE could lessen the leached Ba 2+ concentration.
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