Utilizing organomodified montmorillonite (MMT) (commonly called ‘‘Nanoclay’’) to reinforce polymer-based composites have raised much attention to academic and industrial sectors due to the addition of small amount of nanoclay could considerably enhance the mechanical properties of pristine polymers. In this study the scCO2 process was applied to pre-disperse three commercial Cloisite® nanoclays 10A,20A and 30B, the effects of scCO2 process and chemical and physical properties of clay particles on clay pre-dispersion were examined and the extent of clay predispersion was assessed by SEM, WAXD and TGA. I found that the scCO2 processing results in pre-dispersion of organic modified clays regardless what kind of modifier on them. The degree of dispersion of different kind of clays actually is a competitive result between carbon dioxide-philicity and modifiers interaction. Likewise, TGA information affirms that the scCO2 preparing does not expel surface modifiers from clays, which maintain good solubility of clay in organic solvent and compatibility with organic phase
