Micelle—polymer complexes: Aggregation numbers, micellar rate effects and factors determining the complexation process

Witte, Frank M.; Engberts, Jan B. F. N.

doi:10.1016/0166-6622(89)80256-2

Cited by 74 publications

(74 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…When in the absence of PEO, both systems show a modest increase of n with increasing [surfactant]. This effect has also been observed before (29). We note that SDS micelles are larger than SDoD micelles, but in all cases the differences do not exceed 20%, whereas the n values for the polymer-surfactant complexes are smaller.…”

Section: Mean Aggregation Number (N) Of Micellar Aggregates Supportedsupporting

confidence: 72%

“…In this respect, most aggregation numbers that have been reported were obtained at surfactant or polymer concentrations where the results were probably a weighted average due to a mixture of regular micelles and polymer-surfactant complexes in solution (29,30). Recently we have shown, for PEO-sulfate surfactant systems, that at high PEO concentration, [PEO] = 0.10 M, it is possible to obtain constant n values in the range of cac-psp (16).…”

Section: Mean Aggregation Number (N) Of Micellar Aggregates Supportedmentioning

confidence: 94%

“…It is well known that the size of SDS micelles increases slightly with surfactant concentration (29) and this effect is interpreted in terms of salt-stabilization of aggregates by effectively screening electrostatic interactions on the micellar surface. It is obvious that this effect can be extended to polymer-surfactant complexes that also have charged interfaces.…”

Section: Mean Aggregation Number (N) Of Micellar Aggregates Supportedmentioning

confidence: 99%

See 2 more Smart Citations

The Role of the Carboxylate Head Group in the Interaction of Sodium Dodecanoate with Poly(ethylene oxide) Investigated by Electrical Conductivity, Viscosity, and Aggregation Number Measurements

Zanette

Soldi

Romani

et al. 2002

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Section: Mean Aggregation Number (N) Of Micellar Aggregates Supportedsupporting

confidence: 72%

Section: Mean Aggregation Number (N) Of Micellar Aggregates Supportedmentioning

confidence: 94%

Section: Mean Aggregation Number (N) Of Micellar Aggregates Supportedmentioning

confidence: 99%

See 1 more Smart Citation

The Role of the Carboxylate Head Group in the Interaction of Sodium Dodecanoate with Poly(ethylene oxide) Investigated by Electrical Conductivity, Viscosity, and Aggregation Number Measurements

Zanette

Soldi

Romani

et al. 2002

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…22, No. 6,1990 chain is saturated. In both systems, the forces operating are identical, hydrophobic forces promoting association and clustering of the hydrocarbon portion of the surfactant, electrostatic repulsion between the polymer-bound clusters, and weaker forces between the polymer and head-group regions of the SDS clusters.…”

Section: Model For the Hpc-sds Interactionmentioning

confidence: 99%

The Interaction of Sodium Dodecylsulfate with (Hydroxypropyl)Cellulose

Winnik

1990

Polym J

View full text Add to dashboard Cite

ABSTRACT:(Hydroxypropyl)cellulose (HPC) in aqueous solution interacts with sodium dodecylsulfate (SDS) to give micelle-like SDS clusters bound to the polymer at concentrations well below the critical micelle concentration of SDS itself. We have used the steady-state fluorescence quenching method (fluorophore: pyrene, quencher: benzophenone) to determine mean aggregation numbers (N, molecules of SDS per cluster) for the system. these N values vary with both surfactant and HPC concentrations. The data are consistent with a constant number of cluster binding sites per polymer. These clusters increase in size as the ratio of SDS to HPC is increased. This behavior is very different from that described for the interaction of SDS with poly(ethylene oxide).KEY WORDS Fluorescence Quenching / Neutral Water-Soluble Polymer / Polymer-Surfactant Interaction / Micelle / Mean Aggregation Number / Pyrene, Benzophenone / Critical Micelle Concentration / Several years ago we reported that the interaction of surfactants with (hydroxypropyl)cellulose (HPC), a hydrophobic watersoluble polymer, was different from their interaction with hydrophilic water-soluble polymers, such as poly(ethylene oxide) (PEO) and poly(vinyl pyrrolidone) (PVP).l We used a fluorescent probe technique as well as fluorescence labeling experiments to show that sodium dodecylsulfate (SDS) forms mixed aggregates with HPC at lower concentration than with PEO or PVP. In addition we showed that cationic surfactants, such as cetyltrimethylammonium chloride, which do not interact with PEO or PVP, 2 also form mixed aggregates with HPC. More recently, Lindman and coworkers used pulsed gradient NMR measurements to establish that another hydrophobically modified cellulosic polymer, ethylt To whom correspondence should be addressed. 482(hydroxyethyl)cellulose, also interacts with a cationic detergent, dodecyltrimethylammoniurn bromide. 3 One of the most fascinating discoveries about the interaction of PEO with SDS is the type of aggregation which occurs, and how the aggregate structures vary as the surfactant-topolymer ratio is changed. Elucidated largely by Cabane et al. 4 using NMR and neutron scattering techniques, the picture which emerges is one in which the surfactant forms stoichiometric complexes in the form of small spheres, 20 A in radius, adsorbed onto the PEO strands. The polymer becomes incorporated into the head group region of the SDS clusters. While these clusters are similar in size to pure SDS micelles, they have a lower critical aggregation concentration (cae), and a mean aggregation number (N = 38 ± 30%) signifiPolym.

show abstract

“…A slight increase of n for SDS micelles with increasing SDS concentration has also been determined before (45,46). Witte and Engberts (45), also using the steady-state method, found a difference of ca.…”

Section: Size Of Peo-sds/sdod Complexesmentioning

confidence: 96%

Ideal Mixing of Polymer-Surfactant Complexes of Polyethylene Oxide and Sodium Dodecyl Sulfate Plus Sodium Dodecanoate

Zanette

Frescura

1999

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Micelle—polymer complexes: Aggregation numbers, micellar rate effects and factors determining the complexation process

Cited by 74 publications

References 32 publications

The Role of the Carboxylate Head Group in the Interaction of Sodium Dodecanoate with Poly(ethylene oxide) Investigated by Electrical Conductivity, Viscosity, and Aggregation Number Measurements

The Role of the Carboxylate Head Group in the Interaction of Sodium Dodecanoate with Poly(ethylene oxide) Investigated by Electrical Conductivity, Viscosity, and Aggregation Number Measurements

The Interaction of Sodium Dodecylsulfate with (Hydroxypropyl)Cellulose

Ideal Mixing of Polymer-Surfactant Complexes of Polyethylene Oxide and Sodium Dodecyl Sulfate Plus Sodium Dodecanoate

Contact Info

Product

Resources

About