Investigation of multiple emulsion stability using rheological measurements

Py, Christophe; Rouvière, J.; Loll, Patrick J.; Taelman, Marie-Claire; Tadros, Th

doi:10.1016/0927-7757(94)02918-0

Cited by 21 publications

(15 citation statements)

References 5 publications

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“…The use of block copolymers to stabilize such emulsions was demonstrated by Adam [187] and was confirmed recently by Kanouni et al [188] One of the main criteria for the preparation of stable multiple emulsions is the use of two emulsifiers, the one with low HLB, the other with high HLB values. [189] These requirements can be met by the combination of two block copolymers, such as PS-PEO or PPO-PEO di-or triblock copolymers, the one with more hydrophobic, the other with more hydrophilic characteristics.…”

Section: Polymerization Of Multiple Emulsionsmentioning

confidence: 99%

Block Copolymers in Emulsion and Dispersion Polymerization

Riess

Labbe

2004

Macromol. Rapid Commun.

162

171

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Summary: This article deals with recent progress including the authors' work concerning the application of block copolymers as polymeric surfactants in heterophase polymerizations. The synthesis methods for preparing block copolymers by emulsion and dispersion techniques are outlined, with emphasis on recently developed controlled free radical polymerizations in aqueous media. Specific characteristics of amphiphilic block copolymers are described, for example, micellization and emulsifying effects. A general overview of emulsion and dispersion polymerization in an aqueous and organic medium with ionic and nonionic block copolymers is presented for the preparation of electrosteric and sterically stabilized latex particles. Typical examples of microemulsion, miniemulsion, oil‐in‐oil emulsion, and micellar polymerizations are provided. Current and potential developments of so‐called “hairy latexes”, inverse‐, multiple‐, and solid emulsions, as well as of nonaqueous polymeric dispersions are also discussed.PS foam obtained by free radical polymerization of water‐in‐styrene, stabilized with a PS–PEO diblock copolymer.imagePS foam obtained by free radical polymerization of water‐in‐styrene, stabilized with a PS–PEO diblock copolymer.

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Section: Polymerization Of Multiple Emulsionsmentioning

confidence: 99%

Block Copolymers in Emulsion and Dispersion Polymerization

Riess

Labbe

2004

Macromol. Rapid Commun.

162

171

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“…t 0 decreased by $43% for OC, by $23% for the M68 emulsions and by $40% for the M82 emulsions while it was stable for ADC and NC (non-significant variations of t 0 ). These decreases correspond to the aging of the emulsions according to the studies of Pal (7), Py et al (13) and Tadros (27), who showed that the viscosity, the storage modulus and the yield stress values decreased with aging. Therefore, OC emulsions were more unstable than ADC and NC formulated with the same BTween20/Span60^emulsifier and the emulsions formulated with BMontanov 82^were more affected by the storage time than those formulated with BMontanov 68^.…”

Section: Rheological Measurements At 25-cmentioning

confidence: 64%

“…The variations of these rheological parameters (either increase or decrease) differ and depend on the destabilization process involved (flocculation, creaming, coalescence, Oswald ripening) and the type of interaction between droplets (Brownian movements...). A decrease in the storage modulus G' versus storage time has been measured in several studies (7,13). Paraskevopoulo et al (30) observed a similar decrease in the value of the storage modulus in food emulsions and attributed it to the increase in droplet size.…”

Section: Oscillatory Measurements: Stress Sweepmentioning

confidence: 89%

A Rheological Method to Evaluate the Physical Stability of Highly Viscous Pharmaceutical Oil-in-Water Emulsions

et al. 2006

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“…17 The high elasticity of these systems is a result of the high volume fraction of the multiple emulsions (0.80) and hence droplet interactions are significant, resulting in predominantly elastic systems. 20 The type of the primary emulsifier had a significant impact on the oscillatory parameters of the investigated samples. At the same concentration of lipophilic polymeric emulsifier, the formulation with PHDS showed a markedly higher elasticity.…”

Section: Rheological Measurementsmentioning

confidence: 99%

Rheological and droplet size analysis of W/O/W multiple emulsions containing low concentrations of polymeric emulsifiers

Vasiljević¹,

Parojčić²,

Primorac³

et al. 2009

JSCS

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Multiple emulsions are complex dispersion systems which have many potential applications in pharmaceutics, cosmetics and the food industry. In practice, however, significant problems may arise because of their thermodynamic instability. In this study, W/O/W multiple emulsion systems containing low concentration levels of lipophilic polymeric primary emulsifiers cetyl dimethicone copolyol and PEG-30 dipolyhydroxystearate were evaluated. The concentrations of the primary emulsifiers were set at 1.6 and 2.4 % w/w in the final emulsions. Rheological and droplet size analysis of the investigated samples showed that the type and concentration of the primary lipophilic polymeric emulsifier markedly affected the characteristics of the multiple emulsions. The multiple emulsion prepared with 2.4 % w/w PEG-30 dipolyhydroxystearate as the primary emulsifier exhibited the highest apparent viscosity, yield stress and elastic modulus values, as well as the smallest droplet size. Furthermore, these parameters remained relatively constant over the study period, confirming the high stability of the investigated sample. The results obtained indicate that the changes observed in the investigated samples over time could be attributed to the swelling/breakdown mechanism of the multiple droplets. Such changes could be adequately monitored by rheological and droplet size analysis.

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Investigation of multiple emulsion stability using rheological measurements

Cited by 21 publications

References 5 publications

Block Copolymers in Emulsion and Dispersion Polymerization

Block Copolymers in Emulsion and Dispersion Polymerization

A Rheological Method to Evaluate the Physical Stability of Highly Viscous Pharmaceutical Oil-in-Water Emulsions

Rheological and droplet size analysis of W/O/W multiple emulsions containing low concentrations of polymeric emulsifiers

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