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Elaissari_4304-0_Ch26_R1_04-16-03 08:44:09261Preparation and Applications of2Silicone Emulsions Using Biopolymers3MUXIN LIU, AMRO RAGHEB, PAUL ZELISKO, and4MICHAEL A. BROOKMcMaster University, Hamilton, Ontario, Canada5I. INTRODUCTION6A. Fundamentals7Dispersions of water in oil, or the inverse, are inherently unstable. Emulsifica-8tion is thus a nonequilibrium process such that the average droplet size in an9emulsion tends to increase over time. However, the characteristic time scales10for coarsening of emulsions can span a remarkably wide range, from seconds to11several years, that depends on the nature of the oil, the surfactants used to12stabilize the emulsion , and the processing history. It is fair to say that not all13the parameters affecting emulsion stability are completely understood. Current14practices in emulsion formulation thus combine art with science. With silicones,15being specialty materials and very unlike their organic counterparts, both theory16and art are less well explored than organic Silicone Properties18Silicones possess very unusual properties by organic standards.

39 Elaissari_4304-0_Ch26_R1_04-16-03 08:44:09 Silicone Emulsions 751 1 C. Silicone Emulsion Formulations 2 Silicones can be formulated into …

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