Effects of block architecture and composition on the association properties of poly(oxyalkylene) copolymers in aqueous solution

Booth, Colin; Attwood, David

doi:10.1002/1521-3927(20000601)21:9<501::aid-marc501>3.0.co;2-r

Cited by 406 publications

(578 citation statements)

References 130 publications

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“…Secondly, the salting-out effect of inorganic salts will make the nonionic surfactant more hydrophobic and lower the thermodynamic radius of micelles. 30,40 These combined effects will lead to the decrease in the micelle size, which results in the decrease in pore diameter. The present study demonstrates that the pore size of ordered PMOs can be tuned by simply altering the content of the inorganic salt.…”

Section: Resultsmentioning

confidence: 99%

Highly ordered periodic mesoporous ethanesilica synthesized under neutral conditions

et al. 2005

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Highly ordered mesoporous ethanesilica (MES) with 2D hexagonal structure was synthesized from 1,2-bis(trimethoxysilyl)ethane under neutral conditions for the first time. Divalent salts, such as NiCl 2 , MgCl 2 , ZnCl 2 , ZnSO 4 and Zn(NO 3 ) 2 , were used to help the formation of the ordered mesostructure. The MES samples were characterized by powder X-ray diffraction, nitrogen sorption, transmission electron microscopy, FT-IR, 13 C and 29 Si solid-state NMR and thermal gravimetric analysis. A phase transition from a disordered wormhole-like structure to an ordered P6mm structure was observed upon the addition of inorganic salts. The pore size of the MES decreases from 4.7 to 3.9 nm with increasing content of the inorganic salts. Fluoride was also found to be important for the formation of ordered MES under neutral conditions.

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Section: Resultsmentioning

confidence: 99%

Highly ordered periodic mesoporous ethanesilica synthesized under neutral conditions

et al. 2005

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“…The effect of small molecule surfactants and alcohols on the aggregation behaviour of Pluronic P123 has been widely studied due to their extensive use in industry [1][2][3][4][5][6][7].…”

Section: Discussionmentioning

confidence: 99%

“…A widely studied and practically relevant series of surfactants is the water soluble triblock copolymer group made up of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO), denoted as (PEOn-PPOm-PEOn), commercially known as Pluronic (BASF), Synperonic (Croda) or Poloxamers (ICI) [1][2][3][4][5][6][7]. The CMC is sensitive to the chemical composition of the Pluronic and various grades are available.…”

Section: Introductionmentioning

confidence: 99%

Probing competitive interactions in quaternary formulations

Mansour

Cattoz

Heenan

et al. 2015

Journal of Colloid and Interface Science

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Hypothesis: The interaction of amphiphilic block copolymers of the poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) group with small molecule surfactants may be "tuned" by the presence of selected alcohols, with strong interactions leading to substantial changes in (mixed) micelle morphology, whilst weaker interactions lead to coexisting micelle types. Experiments:The nature and the strength of the interactions between Pluronic P123 (EO20PO70EO20) and small molecule surfactants (anionic sodium dodecylsulfate, SDS, C12SO4Na), (cationic dodecyltrimethylammonium bromide, C12TAB) and (non-ionic polyoxyethylene(23)lauryl ether, Brij 35, C12EO23OH) is expected to depend on the partitioning of the short, medium and long chain alcohols (ethanol, hexanol and decanol respectively) and was probed using tensiometry, pulsed-gradient spin-echo nuclear magnetic resonance (PGSE-NMR) and small-angle neutron scattering (SANS). Findings:The SANS data for aqueous P123 solutions with added alcohols were well described by a charged spherical core/shell model for the micelle morphology. The addition of the surfactants led to significantly smaller, oblate elliptical mixed micelles in the absence of alcohols. Addition of ethanol to these systems led to a decrease in the 2 micelle size, whereas larger micelles were observed upon addition of the longer chain alcohols. NMR studies provided complementary estimates of the micelle composition, and the partitioning of the various components into the micelle.

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“…In dilute solutions, it forms spherical micelle with a "core" made up of hydrophobic block and a "corona" composed of hydrophilic block. In concentrated solutions, a variety of super-structures like body-centered cubic (bcc) or face-centered cubic (fcc) arrays of spherical micelles, hexagonal arrays of elongated micelles and lamellar structures can be formed [3][4][5]. Some of these aggregates are bilayered and biomimetic [6].…”

Section: Introductionmentioning

confidence: 99%

Surface Tension, Density and Viscosity Studies on the Associative Behaviour of Oxyethylene-Oxybutylene Diblock Copolymers in Water at Different Temperatures

Khan¹,

Bibi²,

Pervaiz³

et al. 2012

IJOC

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Effects of block architecture and composition on the association properties of poly(oxyalkylene) copolymers in aqueous solution

Cited by 406 publications

References 130 publications

Highly ordered periodic mesoporous ethanesilica synthesized under neutral conditions

Highly ordered periodic mesoporous ethanesilica synthesized under neutral conditions

Probing competitive interactions in quaternary formulations

Surface Tension, Density and Viscosity Studies on the Associative Behaviour of Oxyethylene-Oxybutylene Diblock Copolymers in Water at Different Temperatures

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