An amphoteric dispersant, copolymer (α-N,N-dimethyl-N- acryloyloxyethyl) ammonium ethanateacrylamide (PAAM/DAAE), was used for the dispersion of BaTiO3 (BT) colloids in an aqueous solution, and compared to a commercial acrylic-based polymeric dispersant, ammonium salt of polymethylacrylic acid (PMAA-NH4). Several properties, including surface potential, sedimentation height ratio, green density, and Ba 2+ dissolution from the particle surface were studied. Due to the branch structure of PAAM/DAAE and more importantly the amphoteric functional groups of PAAM/DAAE, the macromolecules adsorbed on BT in much higher concentration (up to 7 mg/g) and limited the dissolution of Ba2+ ions from the BT surface. Strong steric repulsion between BT particles with PAAM/DAAE resulted in a good dispersion of fine particles and greater packing density in the green state than that of PMAA-NH4. The adsorption mechanism and interactions among BT, dispersants, and H2O are reported.
|Number of pages||8|
|Journal||Journal of Ceramic Processing Research|
|Publication status||Published - 2004 Aug 27|
- Ba dissolution
ASJC Scopus subject areas
- Ceramics and Composites