| Summary: | 碩士 === 國立臺灣師範大學 === 化學系 === 95 === In the preparation of a well-dispersed, and stable barium titanate (BT)
slurry, the addition of dispersants is essential. This study is to synthesize
an anionic copolymer, i.e., poly-[sodium 2-(2-methyl-acryloyloxy)
ethansulfonate methacrylamide] (PMEA) as a dispersant for BT slurries.
The chemical structure of synthesize PMEAs were varied from the IR and
1H-NMR spectra, and the weight-average molecular weights (Mw) of the
copolymers determind by GPC to be 4.1×105，1.3×105，6.0×104 and
1.6×104.
The dispersion properties of PMEA were examined by measuring the
rheological property, sedimentation, and particle size of BT suspensions.
The zeta potential and adsorption experiments were carried out. The
green and sintered density of BT compacts were determind. Besides, the
barium ions leached from BT particles in aqueous solutions were also
measured results indicate that addition of PMEA can reduce the viscosity,
stabilize the BT suspensions, reduce the particle size, and make BT
compacts with higher green and sintered density, PMEA with Mw of
1.3×105 is more effective because the adsorption amount onto particle
was greater and the achieved zeta potential more negative than polymers
with other Mw. Finally, PMEA could reduce the leached barium ion in the
BT suspensions.
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