1H NMR Investigations of the Interactions between Anionic Surfactants and Hydrophobically Modified Poly(acrylamide)s

Effing, Jochem J.; McLennan, Ian J.; Os, N.M. van; Kwak, Jan C. T.

doi:10.1021/j100098a039

Cited by 41 publications

(51 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The present system of aqueous HM-PAM also exhibits hydrophobic aggregation without surfactant addition 28) and a non-cooperative binding is therefore not unlikely. Similar behavior has also been reported for the binding of alkylbenzenesulfonate surfactants to slightly different HM-polyacrylamides 17) where non-cooperative binding was found to take place only onto the hydrophobic side chains.…”

Section: Resultssupporting

confidence: 83%

See 1 more Smart Citation

Polymer self-diffusion and surfactant binding in aqueous solutions of unmodified and hydrophobically modified polyacrylamide studied by pulsed field gradient NMR and surface tension measurements

Kopperud

Walderhaug²,

Hansen

1999

Macromol. Chem. Phys.

View full text Add to dashboard Cite

Polymer and surfactant self-diffusion have been measured by pulsed field gradient NMR in aqueous solutions of hydrophobically modified polyacrylamide (HM-PAM) and an unmodified polyacrylamide (PAM) analogue in order to investigate the binding of surfactant to polymer. The binding has also been calculated from surface tension measurements. The binding of sodium dodecyl sulfate (SDS) to the modified polymer in semidilute solutions displays a non-cooperative binding mechanism, while no such binding is detected for the PAM reference. The polymer self-diffusion decreases with increasing polymer concentration. At a surfactant concentration of ca. 7 mmolal (7 mm) a minimum for the polymer self-diffusion is observed. Previous rheological and present self-diffusion and surface tension results indicate a value of SDS addition for maximum effects on solution viscosity and polymer self-diffusion of approximately 7 mm.

show abstract

Section: Resultssupporting

confidence: 83%

“…Neither Effing et al 17) , nor Sabbadin et al 47) have found evidence for surfactant binding to or interaction with PAM. Studies on EHEC and HM-EHEC systems have revealed binding to both unmodified and modified polymers, but with an observed cac for the EHEC/surfactant systems.…”

Section: Resultsmentioning

confidence: 94%

Polymer self-diffusion and surfactant binding in aqueous solutions of unmodified and hydrophobically modified polyacrylamide studied by pulsed field gradient NMR and surface tension measurements

Kopperud

Walderhaug²,

Hansen

1999

Macromol. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…Kwak et al. 16,17 reported the interactions of HMPAM with SDS or alkylbenzenesulfonates (ABS). When the degree of substitution of HMPAM is larger than 2%, gels may form in SDS/HMPAM and ABS/HMPAM mixtures, resulting from surfactant binding with the hydrophobic side chains of HMPAM.…”

mentioning

confidence: 99%

Self-Assembled Structures of Anionic Hydrophobically Modified Polyacrylamide with Star-Shaped Trimeric and Hexameric Quaternary Ammonium Surfactants

Fan

Wang

et al. 2014

Langmuir

View full text Add to dashboard Cite

The self-assembly of a 1% hydrophobically modified and 30% hydrolyzed polyacrylamide (C12PAM) with cationic star-shaped oligomeric surfactants has been investigated by isothermal titration microcalorimetry, turbidimetry, ζ potential, scanning electron microscopy, and (1)H NMR techniques. The oligomeric surfactants are composed of quaternary dodecyldimethylammonium ions with three or six hydrophobic chains connected by a polyamine spacer at the headgroup level, abbreviated as DTAD and PAHB, respectively. DTAD/C12PAM and PAHB/C12PAM mixed systems undergo the same aggregate transitions with increases in surfactant concentration from soluble networklike aggregates to precipitated denser and more cross-linked structures and then to soluble spherical aggregates. The networklike aggregates are generated at very low surfactant concentration. However, at the corresponding surfactant concentration without C12PAM, DTAD cannot form aggregates and PAHB forms only networklike aggregates with a very loose structure. The strong electrostatic and hydrophobic interaction of DTAD and PAHB with C12PAM and the hydrophobic interaction between the alkyl chains of DTAD and PAHB themselves evidently promote the formation of networklike aggregates. As the surfactant concentration increases, cationic surfactants become excessive. The molecular configuration is changed by the stronger hydrophobic association among the DTAD and PAHB molecules and the enhanced electrostatic repulsion between the mixed aggregates. Thus, the networklike aggregates transfer to spherical aggregates.

show abstract

“…The corresponding hydrophobically modified polymer, HMPAM, could absorb surfactant at hydrophobe sites in a noncooperative way, until it is saturated. 17,[55][56][57][58][59] Hydrophobes interact with SDS in a noncooperative way, which is a continuous process described by the Langmuir isotherm. It is proposed that the absorption is proportional to the number of nucleation siteshydrophobes.…”

Section: Interaction With Sds In Transitional and Surfactant Domainsmentioning

confidence: 99%

“…It is proposed that the absorption is proportional to the number of nucleation siteshydrophobes. Effing et al 56 used surfactants with aromatic rings to study the interaction between HM-PAM and anionic surfactants. They found that HM-PAM was saturated with a limited amount of surfactant.…”

Section: Interaction With Sds In Transitional and Surfactant Domainsmentioning

confidence: 99%

Properties of hydrophobically modified polyacrylamide with low molecular weight and interaction with surfactant in aqueous solution

Shanks

Bryant

2006

J of Applied Polymer Sci

View full text Add to dashboard Cite

Hydrophobically modified polyacrylamide (HMPAM), with a molecular weight of 10 4 g/mol, was studied using a range of rheological methods and dynamic light scattering (DLS). DLS measurements indicate that the association of the modified polymer begins at low concentration. The modified polymer with high substitution forms transient networks below the critical concentration, but the networks are disrupted by the micelles formed by the polymer itself, and the networks do not contribute to viscosity enhancement. The modified polymers exhibited surface activity, and so they may be regarded as nonionic polymeric surfactants rather than thickeners. On the other hand, HM-PAM is shown to interact with the surfactant SDS while PAM is inert to SDS. In the hydrophobic domains, it undergoes a surfactant-induced association process; in the hydrophobe-surfactant transition regions, the surfactant binds to the polymer in a noncooperative way and forms a polymersurfactant complex. Contracted polymer chains begin to extend because of electrostatic repulsion, which can overcome the association at surfactant domains. The conformation of HMPAM polymer chains could be controlled by adding a specific amount of surfactant.

show abstract

1H NMR Investigations of the Interactions between Anionic Surfactants and Hydrophobically Modified Poly(acrylamide)s

Cited by 41 publications

References 4 publications

Polymer self-diffusion and surfactant binding in aqueous solutions of unmodified and hydrophobically modified polyacrylamide studied by pulsed field gradient NMR and surface tension measurements

Polymer self-diffusion and surfactant binding in aqueous solutions of unmodified and hydrophobically modified polyacrylamide studied by pulsed field gradient NMR and surface tension measurements

Self-Assembled Structures of Anionic Hydrophobically Modified Polyacrylamide with Star-Shaped Trimeric and Hexameric Quaternary Ammonium Surfactants

Properties of hydrophobically modified polyacrylamide with low molecular weight and interaction with surfactant in aqueous solution

Contact Info

Product

Resources

About