Graft copolymers as stabilizers for oil-in-water emulsions Part 1. Synthesis of the copolymers and their behaviour as monolayers spread at the air-water and oil-water interfaces

Cárdenas-Valera, A.E.; Bailey, A.I.; Doroszkowski, A.

doi:10.1016/0927-7757(94)03023-s

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…Copolymer Synthesis. The synthesis for poly(NIPAM- co -PEGMa) has been described elsewhere. , It is based on the method reported by Cardenas-Valera et al for graft copolymers containing PEO macromonomers. Brief details are given in the following.…”

Section: Methodsmentioning

confidence: 99%

Effect of Added Surfactant on Temperature-Induced Gelation of Emulsions

Alava

Saunders

2004

Langmuir

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This paper involves an investigation of the effect of added ionic surfactant on the temperature-induced gelation of oil-in-water (O/W) emulsions stabilized by a responsive copolymer. The oil phase used in this study is 1-bromohexadecane. The copolymer is poly(NIPAM-co-PEGMa) (NIPAM and PEGMa are N-isopropylacrylamide and poly(ethylene glycol) methacrylate, respectively). The lower critical solution temperature for the copolymer was 39.5 °C. The ionic surfactant used in this work was sodium dodecylbenzenesulfonate (NaDBS). The critical association concentration for NaDBS and poly(NIPAM-co-PEGMa) was measured at 0.30 mM using fluorescence measurements (pyrene was the probe molecule). Gelation temperatures were measured for the O/W emulsions to establish the effect of added NaDBS and copolymer concentration (C p) on the gelation temperature (T gel). The strength of the gels was measured using dynamic oscillatory measurements. These measurements allowed the shear modulus of the gel at T gel to be estimated as 100 Pa. A theoretical model based on transient network theory was developed that predicts the dependence of T gel on C p. The study revealed that NaDBS has two effects on the overall cross-link density of the emulsion gels: it contributes a source of cross-linking via micellar cross-links and also decreases the proportion of transient cross-links due to electrostatic repulsion.

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Section: Methodsmentioning

confidence: 99%

Effect of Added Surfactant on Temperature-Induced Gelation of Emulsions

Alava

Saunders

2004

Langmuir

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“…The conditions used for the preparation of poly-(NIPAM-co-PEGMa) were specifically designed to promote copolymerisation through an excess of PEG macromonomer at the onset of copolymerisation. 17 A representative preparation for poly(NIPAM-co-PEGMa) is as follows. PEGMa (1.73 g) and tert-butyl alcohol (37.5 ml) were added to a nitrogenpurged five-necked 250 ml reaction kettle equipped with a burette, Teflon stirrer blade, condenser, thermometer and nitrogen inlet.…”

Section: Copolymer Synthesismentioning

confidence: 99%

Temperature-induced gelation of emulsions stabilised by responsive copolymers: A rheological study

Koh

Prestidge

Ametov

et al. 2001

Phys. Chem. Chem. Phys.

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“…Recently, a variety of block and graft amphiphilic copolymers containing hydrophobic and hydrophilic segments, which are also called polymeric surfactants, have been studied very actively owing to their great potential in applications [1][2][3], such as dispersants and stabilizers for dispersion and emulsion [4,5]. The polymeric surfactants can self-assemble into uni-molecular micelles and multimolecular micelles by intra-molecular association and inter-molecular association [6][7][8][9] in water or selective solvents.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Self‐Assembly Behavior of Comb‐Like Surfactant Polymethyl Methacrylate‐g‐Methoxy Polyethylene Glycol

Sun

Wang

et al. 2010

J Surfact & Detergents

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Comb-like surfactant of polymethyl methacrylate-g-methoxy polyethylene glycol (PMMA-g-MPEG) with well-defined structure was synthesized and characterized by FT-IR, 1 H NMR and gel permeation chromatography. Its surface activity and aggregation behavior in aqueous solution were investigated by surface tension measurement, dye encapsulation experiment, transmission electron microscopy (TEM) and dynamic light scattering (DLS). The CMC and surface tension at the CMC of PMMA-g-MPEG were 0.2 g/L and 47 mN/m, respectively. DLS and TEM analysis revealed that PMMA-g-MPEG could self-assemble into spherical micelles with the average hydrodynamic diameters in the range from 20 to 300 nm in aqueous solution.

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Graft copolymers as stabilizers for oil-in-water emulsions Part 1. Synthesis of the copolymers and their behaviour as monolayers spread at the air-water and oil-water interfaces

Cited by 9 publications

References 14 publications

Effect of Added Surfactant on Temperature-Induced Gelation of Emulsions

Effect of Added Surfactant on Temperature-Induced Gelation of Emulsions

Temperature-induced gelation of emulsions stabilised by responsive copolymers: A rheological study

Synthesis and Self‐Assembly Behavior of Comb‐Like Surfactant Polymethyl Methacrylate‐g‐Methoxy Polyethylene Glycol

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