Abstract:

The perfluorocycloether/glycerol emulsions were prepared and their stability was studied. Glycerol was used as the continuous phase, and perfluorocycloether was used as the dispersed phase. Three surfactants （AES, APG and SDS） were selected as emulsifiers. The systems were emulsified at 10 000 r/min for 5 min to obtain stable emulsions. The emulsions were stable after centrifugation at 6 000 r/min for 1 h. After the hot and cold storage stability test （40 ℃, -5 - -10 ℃, 24 h）, the emulsions could still remain stable. In addition, after standing at room temperature for 3 months, the emulsions remained stable and did not show phase separation. Then, the particle size change was studied by dynamic light scattering particle size analyzer. The results showed that the particle size change of the emulsions obeyed the Ostwald ripening rule. Secondly, the microscopic morphology of the emulsions and the particle size change within 3 weeks were observed by transmission electron microscopy, the results of which were consistent with those of the particle size analyzer. It proved that the emulsion stabilized with SDS was the most stable among the three emulsions. Finally, the rheological properties of the emulsions were studied. It proved that the emulsions stabilized with AES and SDS were based on viscous viscoelastic fluids, while the emulsion stabilized with APG was mainly based on viscosity. It was also verified that the emulsion stabilized with SDS was the most stable.

Key words: perfluorocycloether, emulsion, stability