Abstract: Polyhedral oligomeric silsesquioxane (POSS) was used as a physical dispersant to disperse multi-walled carbon nanotubes (MWNTs) in aqueous solution based on their strong interactions. The concentration and stability of MWNTs/POSS aqueous dispersion were characterized by UV-Vis absorbance. Zeta potentials of the aqueous dispersion and weight percentage of the supernatant after centrifugation were measured, while transmission electron microscope (TEM) was used to observe the conjugation state of POSS and MWNTs. Results showed that dispersion capability and stability of MWNTs in aqueous solution were significantly improved by POSS, whereas the dispersion efficiency largely depended on the structure of R organic groups. Among the five kinds of POSS investigated in this study, octaisobutyl POSS (POSSC) presented the best dispersion effects on MWNTs. On this basis, the optimized conditions to disperse MWNTs by POSSC were found out to be: MWNTs concentration of 30 mg/L and the weight ratio between POSS and MWNTs of 1. Under these conditions, POSSC can be well adsorbed onto MWNTs surface, resulting in stable MWNTs/POSS aqueous dispersion. This dispersion method is facile, effective and nondestructive, and the obtained MWNTs/POSS dispersion can be used for nanocomposite construction.
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2017, Vol. 31 
