Microemulsion samples of epoxy group modified polysiloxane were prepared by hydrolytic
polycondensation of active centers, instead of free radical polymerization. The reactions and
mechanisms of the preparation of microemulsions were elucidated and the microemulsions were
characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Photon Correlation Spectroscopy
(PCS), Transmission Electron Microscopy (TEM) and UV-visible Spectrophotometer. The effects of the
amount of catalyzer and epoxy modifier were systematically studied. The results of FT-IR Spectroscopy
indicated that the epoxy group successfully grafted onto the polysiloxane molecules. The microemulsions
show stability when the amount of catalyzer and epoxy modifier are small. The particle size decreases
and the size distribution widens with the increase of the catalyzer. A slight variation of the particle size
occurs when the amount of modifier varied under 1.0 wt%. But the particle size rises rapidly from about
40 nm to 180 nm when the content of modifier is more than 1.0 wt%. The increasing amount of epoxy
modifier makes the size distribution narrower and the appearance of microemulsions transforms from
transparent or semi-transparent state to opaque.