Synthesis and Solution Properties of Hydrophobically Modified (Hydroxyethyl)cellulose

Sau, Arjun C.; Landoll, L. M.

doi:10.1021/ba-1989-0223.ch018

Cited by 45 publications

(18 citation statements)

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“…[1,2] It can strongly increase the viscosity of its aqueous solution due to the formation of intermolecular hydrophobic associations when above the overlap concentration of the polymer chains.…”

Section: Introductionmentioning

confidence: 99%

Interactions between Hydrophobically Modified Associating Polyacrylamide and Cationic Surfactant at the Water‐Octane Interface: Interfacial Dilational Viscoelasticity and Relaxation Processes

Dong-xian

Zhang

et al. 2007

Journal of Dispersion Science and Technology

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The interfacial dilational viscoelastic properties of hydrophobically associating block copolymer composed of acrylamide (AM) and a low amount of 2-ethylhexyl acrylate (EHA) (<1.0 mol%) with a hydrolyzed degree of about 1.5 -2.0% at the octane-water interfaces were investigated by means of two methods: the interfacial tension response to sinusoidal area variations (oscillating barriers method) and the relaxation of an applied stress (interfacial tension relaxation method) respectively. The influence of cationic surfactant cetyl trimethylammonium bromide (CTAB) on the dilational viscoelastic properties was studied. The results obtained by oscillating barriers method showed that dilational modulus decreased moderately with the increase of CTAB concentration. The results obtained by interfacial tension relaxation measurements showed that two main relaxation processes exist in the interface at 7,000 ppm polymer concentration: one is the fast process involving the exchange of hydrophobic blocks between the proximal region and distal region in the interface; the other is the slow relaxation process involving conformational changes of polymer chain in the interface. By adding CTAB, the slow process changed obviously due to the strong electrostatic interaction between oppositely charged surfactant and hydrolyzed part of polymer chain. Only when the CTAB concentration was close to the "equal charge point," the associations formed mainly by the hydrophobic interaction like that in SDS/polymer system appeared and the characteristic time of fast process decreased obviously. The information of relaxation processes obtained from interfacial tension relaxation measurements can explain the results from dilational viscoelasticity measurements very well.

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Section: Introductionmentioning

confidence: 99%

Interactions between Hydrophobically Modified Associating Polyacrylamide and Cationic Surfactant at the Water‐Octane Interface: Interfacial Dilational Viscoelasticity and Relaxation Processes

Dong-xian

Zhang

et al. 2007

Journal of Dispersion Science and Technology

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“…Interactions between HAP and surfactants have been well documented (2)(3)(4)(5) . The addition of surfactants to polymer solutions can influence the microenvironment of both components.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, the polymer chains tend to re-conform to associate with the surfactant. It has been commonly accepted that such systems form hydrophobic microdomains (3,4) through the association of surfactants on hydrophobes of polymers, which cause the polymer chains to extend or prevent association of polymer and surfactant by forming micelle around the pendant groups (5) .…”

Section: Introductionmentioning

confidence: 99%

Effect of Sodium Dodecyl Benzene Sulfonate on Water-Soluble Hydrophobically Associating Polymer Solutions

Zhou

Dong

Guo³

et al. 2004

Journal of Canadian Petroleum Technology

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“…In contrast to hydroxyethyl cellulose (HEC), which viscosifies aqueous sys tems through chain entanglements, the comparatively high solution viscosi ties exhibited by HMHEC solutions are thought to reflect the formation of an extensive three-dimensional polymer network in which the hydrophilic cellulosic backbones of HMHEC are effectively cross-linked through the in termolecular association of neighboring hydrophobic side chains (8). The ESR data presented in Figure 5 show distinct changes in line shape of the 5-DSA spin probe above polymer concentrations of approximately 0.2% suggesting that hydrophobic associations occur at a critical polymer con centration analogous to the critical micelle concentration (cmc) of free sur factants as originally suggested by Landoll (18).…”

Section: Discussionmentioning

confidence: 99%

Solution Properties of a Hydrophobically Associating Cellulosic Polymer

Williams

Meadows

Phillips

et al. 1992

Viscoelasticity of Biomaterials

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Electron spin resonance spectroscopy has been used to investigate the solution properties of a hydrophobically associating cellulosic polymer. Nitroxide spin labels covalently attached to the cellulosic backbone have given information with regard to the segmental motion of the polymer chains, whereas nitroxide spin probes have demonstrated the formation of regions of hydrophobicity above a critical polymer concentration. The data is consistent with the formation of an extensive three--dimensional network in which the hydrophilic cellulosic backbones are effectively cross-linked by the intermolecular association of neighbouring hydrophobic side chains. The work has been extended to study the interaction of the polymer with sodium dodecyl sulphate surfactant and the electron spin resonance data has been used to elucidate the mechanism of interaction, and to explain the unusual rheological behaviour.Hydrophobically associating polymers are finding increasing industrial use due to their ability to impart improved rheological behavior to particulate dispersions (1,2). Consequently, there have been a number of research publications concerning such polymers over recent years (3-13). Essentially, these polymers consist of a hydrophilic backbone and possess a small number of hydrophobic side chains, usually in the range of 8 to 40 carbon atoms in length. Whilst the nature of their backbone usually renders the polymer soluble in aqueous media, intermolecular association of the hydrophobic groups leads to the formation of a weak three-dimensional network structure giving rise to solutions of very high viscosity at low shear rates (8). Addition of surfactants to solutions of hydrophobically associating polymers has also been shown to have a dramatic effect on the rheological properties

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Synthesis and Solution Properties of Hydrophobically Modified (Hydroxyethyl)cellulose

Cited by 45 publications

References 0 publications

Interactions between Hydrophobically Modified Associating Polyacrylamide and Cationic Surfactant at the Water‐Octane Interface: Interfacial Dilational Viscoelasticity and Relaxation Processes

Interactions between Hydrophobically Modified Associating Polyacrylamide and Cationic Surfactant at the Water‐Octane Interface: Interfacial Dilational Viscoelasticity and Relaxation Processes

Effect of Sodium Dodecyl Benzene Sulfonate on Water-Soluble Hydrophobically Associating Polymer Solutions

Solution Properties of a Hydrophobically Associating Cellulosic Polymer

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