Fluorocarbon-Modified Water Soluble Polymers

Zhang, Y.-X.; Hwang, F. S.; Hogen‐Esch, Thieo E.

doi:10.1007/978-3-642-78469-9_7

Cited by 6 publications

(8 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is known that perfluoroalkyls are more hydrophobic than their hydrocarbon analogues. 27 Because of this, Zhang et al [28][29][30] studied copolymers based on polyacrylamide with a small amount of an acrylate or methacrylate with a fluorocarbon-containing group. Such polymers exhibited more pronounced hydrophobic association than the corresponding hydrocarbon-substituted copolymers.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Studies of Hydrophobic Association of Fluorocarbon-Modified Poly(N-isopropylacrylamide)

Li¹,

Jiang²,

Zhang³

et al. 1997

Macromolecules

119

View full text Add to dashboard Cite

A series of hydrophobically associating poly(N-isopropylacryamide) (PNIPAM) containing low amounts (0.06−0.88 mol %) of fluorocarbon (CF3(CF2)7 - ) was prepared by copolymerization of NIPAM and 2-(N-ethylperfluorooctanesulfonamido)ethyl methacrylate. Hydrophobic association of the copolymers in an aqueous medium was investigated by fluorospectroscopy in which both pyrene (Py) and fluorocarbon-substituted pyrene (PyCORf) were used as probes. In comparison with unmodified pyrene, using PyCORf with the same fluorocarbon substituent as in the PNIPAM copolymers proved to be more informative for monitoring hydrophobic associations of the copolymers due to its affinity for the microdomains of the fluorocarbon chains. Both the monomer emission intensity, I 375, and the monomer to excimer ratio of intensities, I 375/I 550, of PyCORf were good indicators of the dependence of the association on the fluorocarbon content of the copolymers and their concentration.

show abstract

Section: Introductionmentioning

confidence: 99%

Fluorescence Studies of Hydrophobic Association of Fluorocarbon-Modified Poly(N-isopropylacrylamide)

Li¹,

Jiang²,

Zhang³

et al. 1997

Macromolecules

119

View full text Add to dashboard Cite

show abstract

“…Hence, the polymer with a higher degree of branching (1:9:5), thickens more efficiently (due to higher M n ) than SB-polymers with lesser associate branched structure (1:98:5). 52 More branching points are available for extension with AM, resulting into more polymeric arms around the core. The effect of AM addition with similar core structures (e.g., 1:9:5, 1:9:10, and 1:9:15), one can observe that higher amount of AM during chain extension results in enhanced thickening capability, which can be explained by the increase in M n .…”

Section: Resultsmentioning

confidence: 99%

“…The effect of AM addition with similar core structures (e.g., 1:9:5, 1:9:10, and 1:9:15), one can observe that higher amount of AM during chain extension results in enhanced thickening capability, which can be explained by the increase in M n . 52 In that respect, polymeric chain extension contributes to pronounced intermolecular associations, thus the formation of a network structure of chains (large aggregates) with larger hydrodynamic volumes and ultimately higher solution viscosity. 18 The higher hydrodynamic volume is caused by enhanced stretching of polymeric chains as a result of steric hindrance.…”

Section: Resultsmentioning

confidence: 99%

“…Similar observations are made at AM amounts of 10 and 15 g for the same core moieties. Hence, the polymer with a higher degree of branching (1:9:5), thickens more efficiently (due to higher M n ) than SB-polymers with lesser associate branched structure (1:98:5) . More branching points are available for extension with AM, resulting into more polymeric arms around the core.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Star-Like Branched Polyacrylamides by RAFT polymerization, Part II: Performance Evaluation in Enhanced Oil Recovery (EOR)

Klemm

Picchioni

Raffa

et al. 2018

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In the present study the performance of a series of star-like branched polyacrylamides (SB-PAMs) has been investigated in oil recovery experiments to ultimately determine their suitability as novel thickening agent for enhanced oil recovery (EOR) applications. Hereby, SB-PAMs were compared with conventional linear PAM. The effect of a branched molecular architecture on rheology, and consequently on oil recovery was discussed. Rheological measurements identified unique properties for the SB-PAMs, as those showed higher robustness under shear and higher salt tolerance than their linear analogues. EOR performance was evaluated by simulating oil recovery in two-dimensional flow-cell measurements, showing that SB-PAMs perform approximately 3–5 times better than their linear analogues with similar molecular weight. The salinity did not influence the solution viscosity of the SB-PAM, contrarily to what happens for partially hydrolyzed polyacrylamide (HPAM). Therefore, SB-PAMs are more resilient under harsh reservoir conditions, which can make them attractive for EOR applications.

show abstract

“…In particular, the role of the attractive hydrophobic interactions, although it had been recognized a long time ago, has been studied systematically only in the past decade. − In this context, the rapid development of amphiphilic polymers, such as hydrophobically modified associative water-soluble polymers and polysoaps , (note that there is no sharp distinction between these materials: polysoap if the hydrophobic content is high, associative polymer if it is low), has been essential. These materials allow us to precisely tune the hydrophobic interactions with surfactants and thereby to change the structure of the obtained intermolecular complexes. , Among associative polymers, the ones with fluorinated hydrophobic groups − occupy a rather exceptional position with their strong, compared to their hydrogenated analogues, tendency to self-associate. Moreover, the presence of fluorine atoms opens a new window, via 19 F NMR, onto the molecular details of the association mechanism.…”

Section: Introductionmentioning

confidence: 99%

NMR Study of the Association of Anionic Surfactants with an Anionic Polyelectrolyte Hydrophobically Modified with Perfluorinated Side Chains

Iliopoulos

Furó

2001

Langmuir

View full text Add to dashboard Cite

Mixtures of surfactants with a hydrophobically modified polyelectrolyte in aqueous solution are investigated by 19F NMR spectroscopy performed on the fluorinated side chains of the polyelectrolyte component. The two added surfactants, one hydrogenated and one fluorinated, behave differently as manifested by the chemical shift effects in the obtained NMR spectra: the mixing of the hydrogenated one with the polyelectrolyte is clearly nonideal, while the mixing of the two fluorinated species is closer to ideal. The different aggregates dominated either by the polyelectrolyte or by the surfactant component share some dynamic features: the exchange of the polyelectrolyte molecules among them is slow, while that of the surfactant molecules is fast on the millisecond time scale.

show abstract

Fluorocarbon-Modified Water Soluble Polymers

Cited by 6 publications

References 13 publications

Fluorescence Studies of Hydrophobic Association of Fluorocarbon-Modified Poly(N-isopropylacrylamide)

Fluorescence Studies of Hydrophobic Association of Fluorocarbon-Modified Poly(N-isopropylacrylamide)

Star-Like Branched Polyacrylamides by RAFT polymerization, Part II: Performance Evaluation in Enhanced Oil Recovery (EOR)

NMR Study of the Association of Anionic Surfactants with an Anionic Polyelectrolyte Hydrophobically Modified with Perfluorinated Side Chains

Contact Info

Product

Resources

About