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An amphoteric water‐soluble copolymer. II. Effect of its molecular weight on the dispersion of barium titanate in water
Author(s) -
Ying KuoLiang,
Hsu KungChung,
Wei WenCheng J.
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22988
Subject(s) - polyacrylamide , dispersion (optics) , copolymer , barium titanate , polymer , materials science , aqueous solution , dispersant , adsorption , chemical engineering , polymer chemistry , steric effects , viscosity , titanate , composite material , chemistry , organic chemistry , ceramic , physics , optics , engineering
An amphoteric water‐soluble copolymer, that is, polyacrylamide/(α‐ N , N ‐dimethyl‐ N ‐acryloyloxyethyl)ammonium ethanate (PAAM/DAAE) was synthesized and it showed the ability to disperse BaTiO 3 (BT) particles in aqueous solutions. In this work, the effect of molecular weight of this polymer on the dispersing properties was further examined. The results indicate that the effectiveness of three polymer samples with different molecular weights in the dispersion of BT particles is P2 ( M w = 1.1 × 10 5 ) > P1 ( M w = 1.2 × 10 4 ) > P3 ( M w = 3.0 × 10 5 ). Apparently, P2 is most effective in dispersing the particles, reducing the viscosity of the suspensions, and obtaining highest green and sintered densities. This is attributed to the highest adsorption of this polymer onto BT powder, and causes strongest electrostatic and steric repulsions. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 886–891, 2006