通过（电位测量及FTIR分析,研究了BaTiO3颗粒对阴离子型分散剂PMAA-NH4的吸附机制.结果表明,加入PMAA-NH4后,由于BaTiO3颗粒表面上存在Ba-OH2+的正电荷中心,从而吸附了分散剂的阴离子,使BaTiO3表面带电特性改变,等电点由pH-5.1移至pH=3.5.当pH=10,PMAA-NH4的加入量为0.8wt％时,BaTiO3颗粒表面吸附达到饱和,可以得到稳定性好的BaTiO3悬浮体.
Adsorption mechanism of dispersant PMAA-NH4 on BaTiO3 was studied by using potential and FTIR spectrum. The results show that the positive charge, Ba-OH2+, existing on the surface of BaTiO3 adsorbs the negative ion of the dispersant. The surface charge of BaTiO3 and its IEP from pH=5.1 to pH=3.5 change after the addition of PMAA-NH4. When pH=10, the concentration of PMAA-NH4 is 0.8wt%, the adsorption comes up to saturation and stabilized BaTiO3 suspension can be obtained.
参考文献
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