利用紫外－可见光谱研究了分散剂聚乙烯亚胺在粉体SiC上的定量吸附情况. 加入酸性PEI后粉体SiC表面的电性发生改变，等电点由pH=2.0移至pH=10.5. 分散剂在粉体上的吸附满足Langmuir单层吸附方程. 对分散剂PEI--H+(pH=3.57)来说，单层吸附值为0.0172mg/mL. 对分散剂PEI--H+(pH=6.61)来说，单层吸附值为0.0208mg/mL. 利用富利叶红外光谱证实了这种吸附作用.
Adsorption behaviour of PEI on silicon carbide powder was measured by using UV spectrum. The surface charge of SiC powder was changed greatly after the addition of PEI, its IEP changed from pH=2.0 to pH=10.5. Adsorption isotherms of dispersant on the silicon carbide surface were investigated. Their adsorption behaviour belongs to Langmuir monolayer adsorption type. The maximum amount of PEI--H+(pH=3.57) adsorbed on the SiC surface is 0.0172mg/mL and that of PEI--H+(pH=6.61) is 0.0208mg/mL. IR spectra were obtained to verify this adsorption effect.
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