Water-soluble copolymers. 39. Synthesis and solution properties of associative acrylamido copolymers with pyrenesulfonamide fluorescence labels

Ezzell, Stephen A.; McCormick, Charles L.

doi:10.1021/ma00033a007

Cited by 103 publications

(65 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to homogeneous polymerization, which usually leads to a random polymer, micellar polymerization favors the incorporation of the hydrophobic monomers as blocks rather than as isolated units along the backbone. [43][44][45]68,69 It has also been shown that the length of the hydrophobic blocks is directly related to the N H number, 18,43-51 which additionally governs the thickening properties of the polymers. 48 -53 In our case, one of the hydrophilic monomers, NaAMPS, is anionic, and this significantly influences the hydrophobe incorporation.…”

Section: Polymer Synthesis and Characterizationmentioning

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%

See 1 more Smart Citation

Rheological properties of multisticker associative polyelectrolytes in semidilute aqueous solutions

Kujawa

Audibert‐Hayet

Selb

et al. 2004

J Polym Sci B Polym Phys

102

View full text Add to dashboard Cite

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.

show abstract

Section: Polymer Synthesis and Characterizationmentioning

confidence: 99%

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

102

View full text Add to dashboard Cite

show abstract

“…But when the attraction is larger than the repulsion, phase separation occurs and the rheological behavior is suspension-like. 40 There are far fewer opportunities for the low molecular weight polymers to form bridge structures, while viscosity cannot be increased significantly. In contrast, the repulsion of polymer clusters is large enough to maintain polymer dissolution.…”

Section: Rheology Of Concentrated Solutionsmentioning

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

“…[32][33][34][35] From the work of many researchers, the nature of hydrophobic associations has been shown to be dictated by many factors including, but not limited to polymer microstructure, [36][37][38][39][40][41] the 'bulkiness' of the hydrophobe, [42][43][44][45] and the chemical composition of the hydrophobe, i.e. (hydrocarbon vs. fluorocarbon).…”

Section: Task 1: Polymer Synthesis Backgroundmentioning

confidence: 99%

For Stimul-Responsive Polymers with Enhanced Efficiency in Reservoir Recovery Processes

McCormick¹,

Hester²

2003

View full text Add to dashboard Cite

Water-soluble copolymers. 39. Synthesis and solution properties of associative acrylamido copolymers with pyrenesulfonamide fluorescence labels

Cited by 103 publications

References 7 publications

Rheological properties of multisticker associative polyelectrolytes in semidilute aqueous solutions

Rheological properties of multisticker associative polyelectrolytes in semidilute aqueous solutions

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

For Stimul-Responsive Polymers with Enhanced Efficiency in Reservoir Recovery Processes

Contact Info

Product

Resources

About