Solution behavior of hydrophobically associating water-soluble block copolymers of acrylamide and N-benzylacrylamide

Yahaya, Garba O.; Ahdab, A.A; Ali, Shaikh A.; Abu-Sharkh, Basel F.; Hamad, Esam Z.

doi:10.1016/s0032-3861(00)00711-4

Cited by 129 publications

(98 citation statements)

References 21 publications

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“…However, some factors, such as the rising temperature of the earth, the presence of salts in the drilling fluid medium, and the mechanical degradation of the polymer, decrease the viscosity of hydrolyzed PAM in the aqueous solution significantly, which limits the application of PAM. Some have focused on the investigation of the macroscopic properties of dilute solutions looking at the effect of temperature, pH, salt concentration and surfactant on the conformation of the polyacrylamide molecules [3][4][5][6][7]. Others have dealt with the microscopic properties and structures of dilute solutions explaining the macroscopic phenomena of the polymer [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of dilute polyacrylamide solutions: effect of salt concentration

et al. 2012

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The structure and intrinsic viscosity of the partially hydrolyzed polyacrylamide (HAPM) and polyacrylamide (PAM) in aqueous solution were investigated by comparative studies of molecular dynamics simulation over a wide range of the NaCl concentration. The radius of gyration (R(g)), the hydrodynamic radius (R(h)) and the ratio of the radius gyration and the hydrodynamic radius (ρ) were calculated for the PAM or HPAM in solutions with different NaCl concentrations at 298 K. The conformational changes of the polymer chain in different aqueous solution were discussed according to the molecular shapes. It was found that the change of the R(h) or the R(g) can reflect the change in the [η]. And the changes in the structure of the polymer chain with different NaCl concentrations were discussed via the ρ which can predict [η] changes. The results showed that behavior of the polymer solution calculated from the simulation agreed with the experimental measurements. Furthermore, the radial distribution functions for the HPAM solutions were investigated, which verified the micro-mechanism for the change of the structure. The results of this research showed that the computational method used in this work has practical applicability.

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Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of dilute polyacrylamide solutions: effect of salt concentration

et al. 2012

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“…Contudo, valores de adsorção acima de 1 mg/g são esperados para polímeros hidrofobicamente modificados [5] . O uso de uma solução extremamente salina (NaCl 300 g.L -1 ) também pode ter influenciado os valores de adsorção medidos nesse trabalho [22] , pois a presença de sais leva a uma diminuição na qualidade do solvente para polímeros hidrofobicamente modificados, já que há uma tendência de parte das moléculas de água solvatarem preferencialmente os íons [6] , o que torna a interação entre o polímero e a superfície sólida ainda mais significativa.…”

Section: Isoterma De Adsorçãounclassified

“…Estes polímeros são constituídos de uma cadeia principal hidrofílica e alguns substituintes hidrofóbicos, que podem se encontrar distribuídos de forma aleatória ao longo da cadeia polimérica ou nas suas extremidades [2] . Devido a sua estrutura anfifílica, esses polímeros podem exibir atividade superficial e adsorver em interfaces [3][4][5][6][7][8][9] . Esta atividade interfacial pode ser de grande interesse tecnológico nas mais variadas aplicações, tais como obtenção de emulsões utilizadas em formulações cosméticas [10] , modificação da superficie de partículas de negro de fumo [11] ou diminuição seletiva da permeabilidade de reservatórios de petróleo [12] .…”

Section: Introductionunclassified

Adsorção de poli(acrilamida-b-N,N-dihexilacrilamida) sobre arenito: determinação das condições para se atingir o equilíbrio real

Maia¹,

Garcia²

2007

Polímeros

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Resumo: Durante as últimas décadas, o interesse em polímeros anfifílicos tem aumentado continuamente. Neste trabalho, o comportamento do copolímero hidrofílico/hidrofóbico poli(acrilamida-b-N,N-dihexilacrilamida) (PADHA) na interface sólido/líquido foi estudado para se quantificar a adsorção quando o equilíbrio do sistema é atingido. Na interface água/arenito, a isoterma de adsorção para a PADHA mostrou uma forma incomum, caracterizada pela ausência de uma região de patamar e um aumento contínuo na quantidade adsorvida com a concentração polimérica. Esta forma de adsorção particular poderia ser explicada pela formação de múltiplas camadas devido a associações hidrofóbicas, através das quais as camadas adsorvidas seriam formadas, em parte, por algumas cadeias que não estão diretamente em contato com a superfície sólida.Palavras-chave: Adsorção, copolímero anfifílico, poliacrilamida. Poly(acrylamide-b-N,N-dihexylacrylamide) Adsorption on Sandstone: Determination of the Conditions to Reach the Real EquilibriumAbstract: During the last few decades, interest in amphiphilic polymers has increased steadily. In this work, the behavior of the hydrophilic/hydrophobic copolymer poly(acrylamide-b-N,N-dihexylacrylamide) (PADHA) at a solid/liquid interface has been studied to quantify adsorption at equilibrium. At the water/sandstone interface, the adsorption isotherm for PADHA show an unusual profile, characterized by the absence of a "plateau" region and a monotonic increase in the adsorbed amount with polymer concentration in the bulk. This particular adsorption profile could be explained by the formation of multiple layers caused by hydrophobic associations, the adsorbed layers being partly formed by chains that are not directly in contact with the surface.

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“…An appropriate hydrophobic monomer is the key to preparing HAP with excellent properties. To date, many kinds of hydrophobic monomer have been applied to prepare HAP, 19 which can be sorted into several types according to spacer group between double bond and hydrophobic chain, such as ACOOA, [20][21][22] ANHCOA, 14,[23][24][25] and AC 6 H 4 A, 17,26 etc. However, ester and amide groups, especially ester group, are easily hydrolyzed in an unneutral aqueous solution or in high temperature.…”

Section: Introductionmentioning

confidence: 99%

A double‐tailed acrylamide hydrophobically associating polymer: Synthesis, characterization, and solution properties

Jiang

et al. 2015

J of Applied Polymer Sci

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In order to improve the salt resistant, temperature tolerance, and stability of the acrylamide-based copolymer, the doubletailed hydrophobically associating copolymer (DTHAP) was synthesized. The chemical and spatial network structures of the copolymer were characterized by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (NMR), and environmental scanning electron microscope (ESEM). The salt, temperature, aging resistance, and rheological behavior of the copolymer were investigated in detail. The experimental results showed that the performance of DTHAP were influenced by the amount of AA, PETMAM, SDS, and NaCl in the reaction system. Compared with HPAM, DTHAP solution showed excellent temperature resistance and salt tolerance. No matter in the solution varying NaCl or CaCl 2 concentration from 8 to 80 and 1 to 1.8 g/L, respectively, DTHAP behaved an obvious salt-thickening phenomenon. The simulative tertiary oil recovery tests at 808C indicated that DTHAP can remarkably enhance 16.9% of the oil recovery ratio. Even at 100 g/L salt solution, DTHAP exhibited an excellent performance which can also enhance 9.9% of oil recovery ratio. The experiment results indicated that DTHAP was superior to HPAM as a kind of oil displacement agent for enhanced oil recovery, especially in high-temperature and high-mineralization oil fields.

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Solution behavior of hydrophobically associating water-soluble block copolymers of acrylamide and N-benzylacrylamide

Cited by 129 publications

References 21 publications

Experimental and theoretical study of dilute polyacrylamide solutions: effect of salt concentration

Experimental and theoretical study of dilute polyacrylamide solutions: effect of salt concentration

Adsorção de poli(acrilamida-b-N,N-dihexilacrilamida) sobre arenito: determinação das condições para se atingir o equilíbrio real

A double‐tailed acrylamide hydrophobically associating polymer: Synthesis, characterization, and solution properties

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