Enhanced Stability of the Dispersed Phase Stabilized
by Polyether-Modified Siloxane in the Double Emulsion System: Storage Stability
and Rheological Investigation
The
dispersed phase of the water-in-oil-in-water emulsion system
appears to be useful as a novel drug-delivery system in pharmaceuticals,
food, and cosmetics applications. Until recently, achieving the storage
stability of double emulsions under extreme conditions was unthinkable.
Here, we prepared highly stable dispersion systems from polyether-modified
siloxanes (PMS1 and PMS2) in fatty alcohol polyoxyethylene ether that
stabilized outer water of double emulsions. The effects of the PMS1/PMS2
stabilizer on the stability and rheological behaviors of double emulsions
were investigated. It was found that the used polymer type controlled
the final double emulsion properties. Double emulsions obtained from
PMS1 dispersion had lower stabilities than PMS2 dispersion that was
stable for more than six months and about 20 days under 50–60
°C storage conditions. Interestingly, this double emulsion showed
a dominant elastic modulus under the low shear ranges that were absent
in the PMS1 double emulsion system.