Associating behaviour of polyacrylamides hydrophobically modified with dihexylacrylamide

Volpert, Edgar; Selb, Joseph; Candau, Françoise

doi:10.1016/s0032-3861(97)00393-5

Cited by 258 publications

(246 citation statements)

References 44 publications

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“…Polyacrylamide derivatives Polyisobutylene-b-poly(N,N-dimethylacrylamide) [94] Polyacrylamide hydrophobically modified with dihexylacrylamide [95] [105]. Cao and others prepared polystyrene-poly(methacrylic acid) (PS-PMA) block copolymer micelles by directly adding the polymer to 80:20 v/v dioxane:water followed by a stepwise dialysis to pure aqueous buffer [106].…”

Section: Methods Of Preparationmentioning

confidence: 99%

Polymeric micelles: authoritative aspects for drug delivery

Kulthe

Choudhari

Inamdar

et al. 2012

Designed Monomers and Polymers

187

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Section: Methods Of Preparationmentioning

confidence: 99%

Polymeric micelles: authoritative aspects for drug delivery

Kulthe

Choudhari

Inamdar

et al. 2012

Designed Monomers and Polymers

187

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“…In most cases, in the semidilute regime, a significant decrease in viscosity has been observed with increasing temperature, suggesting a concomitant decrease in the strength of the hydrophobic associations. 13,26,29,32,51,76,92 In contrast, in the dilute regime, temperature-enhanced viscosity has been observed due to the disruption of the intramolecular interactions. 13,[92][93][94] In this study, we have investigated the effect of the temperature for the N7 sample well below the entanglement concentration (C ϭ 0.09 wt %; Fig.…”

Section: Temperature Effect On the Viscoelastic Behaviormentioning

confidence: 99%

“…It has been inferred from photophysical and rheological experiments that the length of these hydrophobic segments corresponds roughly to the average number of hydrophobic monomers per micelle (N H ). 18,[43][44][45][46][47][48][49][50][51] It has also been clearly established that the thickening efficiency is directly related to the polymer microstructure: the longer the hydrophobic blocks, the greater the thickening efficiency at a constant level of hydrophobe incorporation. 48 -53 In this report, we describe the micellar synthesis and aqueous solution properties of multiblock polyelectrolytes of AM, sodium 2-acrylamido-2-methylpropanesulfonate (NaAMPS), and N,N-dihexylacrylamide (DiHexAM).…”

Section: Introductionmentioning

confidence: 99%

Rheological properties of multisticker associative polyelectrolytes in semidilute aqueous solutions

Kujawa

Audibert‐Hayet

Selb

et al. 2004

J Polym Sci B Polym Phys

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102

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Multisticker associative polyelectrolytes of acrylamide (Ϸ86 mol %) and sodium 2-acrylamido-2-methylpropanesulfonate (Ϸ12 mol %), hydrophobically modified with N,N-dihexylacrylamide groups (Ϸ2 mol %), were prepared with a micellar radical polymerization technique. This process led to multiblock polymers in which the length of the hydrophobic blocks could be controlled through variations in the surfactant-tohydrophobe molar ratio, that is, the number of hydrophobes per micelle (N H ). The rheological behavior of aqueous solutions of polymers with the same molecular weight and the same composition but with two different hydrophobic block lengths (N H ϭ 7 or 3 monomer units per block) was investigated as a function of the polymer concentration with steady-flow, creep, and oscillatory experiments. The critical concentration at the onset of the viscosity enhancement decreased as the length of the hydrophobic segments in the polymers increased. Also, an increase in the N H value significantly enhanced the thickening ability of the polymers and affected the structure of the transient network.In the semidilute unentangled regime, the behavior of the polymer with long hydrophobic segments (N H ϭ 7) was studied in detail. The results were well explained by the sticky Rouse theory of associative polymer dynamics. Finally, the viscosity decreased with an increase in the temperature, mainly because of a lowering of the sample relaxation time.

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“…It is well known that there are intramolecular association and intermolecular association in HAPAM aqueous solution due to the presence of hydrophobic groups. When the concentration of HAPAM is above a certain concentration, intermolecular hydrophobic interaction will lead to the formation of dynamic three-dimensional network structure and supramolecular aggregates, which can dramatically enhance the viscosity (thickening ability) [10,11]. These polymers have potential applications in many fields including enhanced oil recovery, drilling fluids, coatings, water treatment, etc.…”

Section: Introductionmentioning

confidence: 99%

A new approach to the synthesis of hydrophobically associating polyacrylamide via the inverse miniemulsion polymerization in the presence of template

Gong

Zhang²

2009

Express Polym. Lett.

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Abstract. Cationic, hydrophobically associating polyacrylamide (PDA) was synthesized via the inverse miniemulsion polymerization in the presence of template. Dimethyloctane(2-acrylamidopropyl)ammoniumbromide (DOAB) was synthesized via quaternization reaction and used as the hydrophobic monomer. Polyacrylic acid (PAA) was used as template for the oppositely charged DOAB. The distribution of DOAB in the inverse miniemulsion and the solution viscosity behaviors of PDA were investigated. The results showed that the complexes of DOAB and PAA were located not only at the interface of the inverse miniemulsion droplets and oil phase but also in the interior of inverse miniemulsion droplets. PDA prepared with template exhibited remarkable enhancement of solution viscosity (thickening ability). And the optimal thickening ability was obtained when the aqueous phase pH was 6.5 and the ratio of DOAB to PAA was 1. The thickening ability of PDA was improved with increasing DOAB content. PDA prepared with template showed stronger association ability than that prepared without template for its longer hydrophobic block structure, which was further supported by the plots of fluorescence spectra.

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Associating behaviour of polyacrylamides hydrophobically modified with dihexylacrylamide

Cited by 258 publications

References 44 publications

Polymeric micelles: authoritative aspects for drug delivery

Polymeric micelles: authoritative aspects for drug delivery

Rheological properties of multisticker associative polyelectrolytes in semidilute aqueous solutions

A new approach to the synthesis of hydrophobically associating polyacrylamide via the inverse miniemulsion polymerization in the presence of template

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