We have tried to prepare
the porous silicone resin sheet with the phase inversion method in parallel
with the non solvent induced phase separation method. In the experiment, ethyl
acetate and water were adopted as a good solvent and a poor solvent for
silicone resin, respectively and ethyl alcohol as an amphiphilic solvent was
used to increase the solubility of ethyl acetate in water and decrease the
interfacial tension by mass transfer from water to ethyl acetate. The
concentration of silicone resin in ethyl acetate and the oil soluble surfactant
species were changed. Increasing the concentration
of silicone resin could depress coalescence between the water droplets in the
(W/O) dispersion and increase the porosity and pore number density of
silicone resin sheet. Span 80 among the oil soluble surfactant species made the
porosity and pore number density larger. The effect of physical proparties of
liquids concerned on the porosity and pore number density was discussed on the
basis of dispersing behavior of liquid droplets in the liquid-liquid
dispersion. The hollow silicone resin particles could be prepared by applying
the preparation method presented here.
Cite this paper
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