| 초록 |
Small angle light scattering and field emission scanning electron microscope have been used to quantify the kinetics of liquid-liquid separation behavior during water vapor quenching (non-solvent induced phase separation, NIPS) of polysulfone in NMP solution. Time dependence of the position of the light scattering maximum was measured by following various water vapors. For quenching to appropriate water vapor, domain growth rates increased with increasing quenching depth and the content of alcohol used as additive. Light scattering and microscopy shows that solutions quenched to water vapor showed ring-type scattering patterns. Also, in the early stage of phase separation, the scattering intensity with time was in accordance with Cahn's linear theory of spinodal decomposition, regardless of types of non-solvent additive. |
