Experimental Study of a Lyotropic Lamellar Phase Swollen with Polymer Solutions

Ficheux, M.-F.; Bellocq, A. M.; Nallet, Frédéric

doi:10.1051/jp2:1995167

Cited by 48 publications

(96 citation statements)

References 15 publications

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“…Two possible explanations can be argued (i) An interaction between the comonomers and the polar AOT head group. This effect was previously reported for similar systems [32,33].…”

Section: Before Polymerizationsupporting

confidence: 89%

Fibrillar morphologies of hydrogels obtained from a lamellar medium

Pacios

Renamayor

2012

European Polymer Journal

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Hydrogels are suitable for multiple applications and their properties are strongly dependent on their morphology. Sponge-like morphologies are obtained in conventional hydrogels when the polymerization is performed in isotropic media. Fibrillar morphologies imparting new properties to hydrogels are expected when the reacting medium is anisotropic. Here, we synthesize such fibrillar hydrogels by polymerization in a lamellar medium formed by 1,4-bis(2-ethylhexyl)sodium sulfosuccinate (AOT) and water. At high surfactant content this objective is achieved, and the thickness of the obtained fibrils (0.1-1 µm) can be correlated with the physical properties of the lamellar system. At intermediate AOT concentrations, the morphology is hierarchical, with primary closed pores containing a secondary fibrillar structure that fills the pores. For low AOT concentrations, the crosslinking process is unhindered, and the hydrogels are mechanically consistent with a sponge-like morphology having large (10-10 2 µm) void pores. The time evolution of the mesophase as polymerization advances is followed by small angle X-ray scattering.

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“…Two possible explanations can be argued (i) An interaction between the comonomers and the polar AOT head group. This effect was previously reported for similar systems [32,33].…”

Section: Before Polymerizationsupporting

confidence: 89%

Fibrillar morphologies of hydrogels obtained from a lamellar medium

Pacios

Renamayor

2012

European Polymer Journal

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“…However, in recent years an interest has been increasingly directed towards the study of polymers effects on more concentrate surfactant solutions, especially on the lamellar phases (L α phase) [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The lamellar phases are Liquid-Crystal Smectic A phases which consist in planar stacks of bilayers, containing surfactant and cosurfactant molecules, separated by a solvent.…”

Section: Introductionmentioning

confidence: 99%

“…Different properties and behaviours can be achieved by playing with the inter-membrane interactions and the surfactants (and/or solvent)/polymer interactions. Depending on the polymer interactions with the surfactants (and/or the solvent), the polymer can be localised entirely in the membrane [9,20], both in the membrane and in the solvent [8], adsorbed onto the bilayer surface [13,16,17], or localised entirely in the solvent [11,12,19]. Therefore, the addition of a polymer to a lamellar phase can influence the inter-membrane interactions by altering the structure of the bilayers (i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Electrostatic interactions will be favoured for ionic surfactants when the solvent will be low in salt, but undulation interactions will be dominant for non-ionic surfactants or systems containing high levels of salt or if an oil is used as the swelling agent. Thus, the study of such systems has recently developed both theoretically [12,[22][23][24] and experimentally [7][8][9][10][11][12][13][14][15][16][17][18][19][20] with most of the studies concentrating on systems composed of watersoluble uncharged polymers and ionic surfactants.…”

Section: Introductionmentioning

confidence: 99%

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Softening of the interactions between surfactant bilayers in a lamellar phase due to the presence of a polymer

et al. 1999

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The compressibility modulus of a lamellar phase containing a neutral polymer guest molecule was measured directly using a surface force apparatus. The system studied consisted of sodium dodecyl sulphate (SDS), pentanol, water and polyethylene glycol (PEG) (Mw = 22 600 g/mol). The lamellar phase was induced from a micellar phase in situ via a confinement induced isotropic to lamellar phase transition. This avoided problems resulting from the viscosity and turbidity normally characteristic of these lamellar phase samples. Increasing the amount of PEG resulted in a marked decrease in the layer compressibility modulusB indicating a decrease in the repulsive forces between the lamellae. The origin of such a phenomenon is discussed in terms of different mechanisms including depletion interactions, bridging interactions and modification of the electrostatic interaction between the lamellae by the polymer. PACS. 82.70.-y Disperse systems -64.70.Md Transitions in liquid crystals -61.25.Hq Macromolecular and polymer solutions; polymer melts; swelling

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“…Polymers may significantly modify the properties of selfassembled surfactant structures in micellar solutions (1), microemulsions (2), and liquid crystals (3)(4)(5). These systems comprise a wide variety of industrial applications (e.g., paints and pharmaceuticals) and give further insights into membrane formation processes (6).…”

Section: Introductionmentioning

confidence: 99%