Influence of SDS and two anionic hydrotropes on the micellized state of the triblock copolymer E71G7E71

Barbosa, Sílvia; Taboada, Pablo; Castro, Emilio; Mosquera, Vı́ctor

doi:10.1016/j.jcis.2005.09.019

Cited by 19 publications

(8 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…F127 unimers have completed the micellization at 30 °C, and hence, the high endothermic value is attributed to the interaction between F127 micelles and [Doim]Br. It is reported that the interactions between the copolymer and anion surfactant lead to the formation of the complex as polymer micelle/surfactant and further to a disruption of copolymer micelles . The disruption of the F127 micelle would arise, which is an exothermic effect, resulting in a decrease of Δ H obs with the concentration of [Doim]Br.…”

Section: Resultsmentioning

confidence: 99%

“…It is reported that the interactions between the copolymer and anion surfactant lead to the formation of the complex as polymer micelle/surfactant and further to a disruption of copolymer micelles. 35 The disruption of the F127 micelle would arise, which is an exothermic effect, resulting in a decrease of ΔH obs with the concentration of [Doim]Br. At higher [Doim]Br concentrations, the formation of the complex with a skeleton of [Doim]Br micelles might lead to a slight rehydration of F127 chains, which leads to an exothermic effect showing a lower ΔH obs value than in the system [Doim]Br/water.…”

Section: ■ Experiments Sectionmentioning

confidence: 99%

See 1 more Smart Citation

Aggregation of Double-Tailed Ionic Liquid 1,3-Dioctylimidazolium Bromide and the Interaction with Triblock Copolymer F127

Wang

Wei

et al. 2013

J. Phys. Chem. B

View full text Add to dashboard Cite

The aggregation of ionic liquid-based double-tailed surfactant, 1,3-dioctylimidazolium bromide ([Doim]Br) and its interaction with pluronic copolymer F127 were systematically investigated by nuclear magnetic resonance (NMR), surface tension, dynamic light scattering (DLS), and isothermal titration calorimetry (ITC). It was found that the [Doim]Br aggregates are composed with the alkyl chains embedded in the micellar core and with the imidazolium rings parallel and staggered on the hydrophilic layer of micelles, which was generally different from the single-tailed IL [omim]Br. The hydrogen bonding between protons attached to the imidazolium rings and anion Br(-) was enhanced upon the aggregation of [Doim]Br. The aggregation of F127 was promoted by addition of [Doim]Br, which was more efficient than the single-tailed surfactant. At lower [Doim]Br content, [Doim]Br monomers embedded deeply into F127 micelle core. At higher [Doim]Br concentrations, the F127 micelles were disassociated, and then F127 chains penetrated into [Doim]Br micelle. In addition, the microstructure of F127/[Doim]Br complex can also be tuned by temperature.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: ■ Experiments Sectionmentioning

confidence: 99%

Aggregation of Double-Tailed Ionic Liquid 1,3-Dioctylimidazolium Bromide and the Interaction with Triblock Copolymer F127

Wang

Wei

et al. 2013

J. Phys. Chem. B

View full text Add to dashboard Cite

show abstract

“…28,29 Hydrotropes, like alkanols, 30 increase the surfactant solubility in water as they break the liquid crystalline phases formed at high surfactant concentration.…”

Section: Hydrotrope-surfactant Mixturesmentioning

confidence: 99%

“…Hydrotropes are commonly used in conjunction in detergent and polymer industrial formulations for many years and these additives can modify the surfactant phase and properties. 28,29 Hydrotropes, like alkanols, 30 increase the surfactant solubility in water as they break the liquid crystalline phases formed at high surfactant concentration.…”

Section: Hydrotrope-surfactant Mixturesmentioning

confidence: 99%

Action of hydrotropes and alkyl-hydrotropes

2011

View full text Add to dashboard Cite

Hydrotropes are small molecule amphiphiles, having considerable industrial importance as agents for solubilization of hydrophobic substances in aqueous systems. The physico-chemical origin and mechanism of hydrotrope action has been a subject of academic debate and controversy for many years. One important issue is how close the solution physical chemistry of hydrotropes resembles that of common surfactants. This article seeks to improve the appreciation of this field by comparing thermodynamic, phase, spectroscopic and scattering studies of hydrotrope aqueous solutions. In addition, alkyl-hydrotropes are discussed, which represent a structural evolution from classic hydrotropes towards common surfactants, having solution properties more reminiscent of surfactants.

show abstract

“…Such finding raises many questions about the importance of the forces which are usually regarded as minor compared to electrostatic ones for the formation of the complex. The vast majority of complexes reported in literature so far are formed between a polyelectrolyte and an ionic surfactant. − Meanwhile, there is also proof that complexation can occur between a neutral polymer and an ionic surfactant ,− or vice versa, − or even, though very rarely, when both components are neutral . Thus, for deeper understanding of the mechanisms involved in complex formation, other interactions must be taken into consideration.…”

Section: Introductionmentioning

confidence: 99%

pH Sensitive Polymer Nanoparticles: Effect of Hydrophobicity on Self-Assembly

et al. 2010

View full text Add to dashboard Cite

The influence of hydrophobicity on formation, stability, and size of pH-responsive methacryloylated oligopeptide-based polymer nanoparticles has been studied by dynamic light scattering (DLS), transmission electron microscopy (Cryo-TEM), and NMR. Different polyanions/surfactant systems have been studied at constant polymer concentration and within a broad range of surfactant concentrations. The two newly synthesized pH-sensitive hydrophobic polyanions, poly(N(ω)-methacryloyl glycyl-L-leucine) and poly(N(ω)-methacryloyl glycyl-L-phenylalanyl-L-leucinyl-glycine), and three nonionic surfactants (Brij97, Brij98, and Brij700) have been investigated. The surfactants were different in the length of hydrophilic poly(ethylene oxide) (PEO) chain. In surfactant-free solution at basic pH, the polyanions form hydrophobic domains. In the presence of a surfactant, our results prove the complex formation at high pH between the nonionic surfactant and the polyelectrolyte; a pearl-necklace structure is formed. At low pH below critical pH (pH(tr)), reversible nanoscale structures occur in solutions for all systems. The detailed mechanism of the formation of pH-sensitive nanoparticles from polymer-surfactant complex with varying pH is established. Our results suggest that the polymer hydrophobicity is of primary importance in pretransitional behavior of the complex. Once preliminary nanoparticle nuclei are formed, the hydrophobicity of the polymer plays a minor role on further behavior of formed nanostructures. The subsequent transformation of nanoparticles is determined by the surfactant hydrophilicity, the length of hydrophilic tail that prevents further aggregation due to steric repulsions.

show abstract

Influence of SDS and two anionic hydrotropes on the micellized state of the triblock copolymer E71G7E71

Cited by 19 publications

References 39 publications

Aggregation of Double-Tailed Ionic Liquid 1,3-Dioctylimidazolium Bromide and the Interaction with Triblock Copolymer F127

Aggregation of Double-Tailed Ionic Liquid 1,3-Dioctylimidazolium Bromide and the Interaction with Triblock Copolymer F127

Action of hydrotropes and alkyl-hydrotropes

pH Sensitive Polymer Nanoparticles: Effect of Hydrophobicity on Self-Assembly

Contact Info

Product

Resources

About