Phase Behaviour Physical Properties of Batyl Alcohol
Batyl alcohol (monoalkylether glycerine) acts as an emulsifier when used in emulsion products, such as cosmetics creams, lotions and ointments. It is chemically stable, highly purified and safe. Although batyl alcohol is widely used in cosmetic products, little is known about its phase behaviour...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2004
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/6329/1/FSAS_2004_9.pdf |
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| Summary: | Batyl alcohol (monoalkylether glycerine) acts as an emulsifier when used
in emulsion products, such as cosmetics creams, lotions and ointments. It is
chemically stable, highly purified and safe. Although batyl alcohol is widely used
in cosmetic products, little is known about its phase behaviour and rheological
properties in ternary systems. Its phase behaviour in ternary systems was
therefore studied at 80°C, and observed under a polarising microscope.
In the ternary systems, lamellar and hexagonal areas were found in
90110 and 10010 mixtures of batyl alcohol (BA) and isopropyl myristate (IPM)
and the percentage of water were from 9% - 44% wlw, respectively. They were
identified by their patterns of maltese crosses and fan structures, respectively.Both of them exhibited a viscoelastic network. Further addition of either medium
chain triglycerides (MCT) or propylene glycol (PG) to the system resulted in
isotropic and two-phase areas being formed instead of a liquid crystalline
structure.
Using a combination of BA, IPM, MCT and water, an emulsion was
developed. A ratio of 1 :1 MCT:water was emulsified with 5% and 10% BA. A
weak viscoelastic network was formed with 5% BA but without stearic acid
(Emulsion S1). With stearic acid (Emulsion S2) a strong viscoelastic network
was formed with the acid acting as a co-emulsifier. No network structure was
found in the emulsion containing 10% BA (Emulsion S4) as it was stabilized by
the right percentage of BA. The emulsifiers adsorbed at the MCThvater
interface, reducing the droplet size and increasing the viscosity, while the rest
formed liquid crystalline lamellar in the continuous phase to physically trap the
droplets in the network. The conductivity measured revealed that oil-in-water
emulsion can conduct electric and it also shows the oil droplets encapsulated
by the emulsifier in S2. |
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