[[abstract]]This study has prepared an anionic copolymer, poly (4-carboxyamino-4 -oxo-2-butene/acrylamide) (PCOB).Experimentally, PCOBs of different molecular weight were prepared by changing the initiator concentra- tion, chain transfer agent concentration, and reaction temperature and their dispersion properties on BaTi4O9 slurries were studied. The results were compared to those with a commercial dispersant, i.e., ammonium salt of polymethylacrylic acid, PMAAN. PCOB was prepared from 4-carboxyamino-4-oxo-2-butene and acrylamide through a free radical copolymerization. 4-carboxyamino-4-oxo-2-butene was made by reacting maleic anhydride with ammonium carbamate. The chemical structures of PCOB have been identified confirmed by H1-NMR and IR spectra, and weight-average molecule weight of 4 PCOBs (Mw=2.8x105、1.0x105、6.0x104 and 1.8x104) were measured by GPC. The dispersion properties of each dispersant were evaluated by the viscosity, sedimentation volume, particle size distribution, zeta potential ,of the resulting BaTi4O9 slurries. Besides,the sintered density, green density, dielectric constant and dielectric loss of BaTi4O9 compacts were determined. The results indicate that PCOB (Mw=1.8x104) shows the best dispersion effects on the BaTi4O9 powder in aqueous slurries than PCOB with other molecular weight. For greater amount of PCOB(Mw=1.8x104) was adsorbed on BaTi4O9 particles. The resulting green parts with PCOB (Mw=1.8x104) show greater density, and the sintered parts have higher dielectric constant and lower dielectric loss. Thus, PCOB (Mw=1.8x104) exhibits better dispersion properties than other PCOBs.
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