Degradation of semidilute polymer solutions in elongational flows

Müller, Alejandro J.; Odell, J. A.; Carrington, S.P.

doi:10.1016/0032-3861(92)91143-p

Cited by 41 publications

(33 citation statements)

References 15 publications

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“…In these regimes, compared to the dilute case, a given chain feels an extra stress resulting from the hydrodynamic interactions with the surrounding other chains, thus should break more easily in the same macroscopic flow field. Experimentally, this effect has been confirmed by several groups [7,8,15], showing in all case an increase in the degradation rate with increasing concentrations. However, to date, a dependence of a critical deformation rate for degradation has not been experimentally established quantitatively for concentration effects and the theoretical ideas remain qualitative.…”

Section: Concentration Effectssupporting

confidence: 69%

“…Experimental [3,[6][7][8][9] and numerical studies [24,25] of the critical deformation rate for breaking for monodisperse dilute solutions report aε c ∝ M −w dependence, with 1 ≤˛≤ 2. The exponent = 1.7 ± 0.3 we find for our polydisperse semi-dilute solutions is in the range of these previous results.…”

Section: Discussionmentioning

confidence: 95%

“…In particular studies have focused on single abrupt constrictions [3][4][5] and cross-slot geometries, combined with birefringence and GPC measurements [6][7][8][9]. These methods give a quite detailed insight as to the resulting breakage.…”

Section: Introductionmentioning

confidence: 98%

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Flow-induced polymer degradation probed by a high throughput microfluidic set-up

Nghe

Tabeling

Ajdari

2010

Journal of Non-Newtonian Fluid Mechanics

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Section: Concentration Effectssupporting

confidence: 69%

Section: Discussionmentioning

confidence: 95%

See 1 more Smart Citation

Flow-induced polymer degradation probed by a high throughput microfluidic set-up

Nghe

Tabeling

Ajdari

2010

Journal of Non-Newtonian Fluid Mechanics

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“…Indeed, the presence of numerous network junctions increases the number of constraints exerted on a chain and also the number of potential scission points. This explanation is in accordance with the random scission scenario validated by GPC analysis for degraded semi-dilute polymer solutions [17]. However, the results of these experiments have been analyzed at constant concentration, hence corresponding to different entanglement densities for the different molecular weights investigated.…”

Section: Mechanical Degradation Of Semi-dilute Solutionssupporting

confidence: 82%

“…Birefringence measurements showed that the flow was unstable, particularly close to the stagnation point. Besides, under such conditions, Gel Permeation Chromatography (GPC) highlighted a random scission phenomenon [17]. For a fast transient laminar flow of semidilute polymer solutions, a relationship between a critical scission strain rate ε · c and molecular weight M was established by Nghe et al [18] using a microfluidic device: (5) with k equal to 1.7 ± 0.3.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Degradation Onset of Polyethylene Oxide Used as a Hydrosoluble Model Polymer for Enhanced Oil Recovery

Dupas

Hénaut

Argillier

et al. 2012

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Résumé -Seuil de dégradation mécanique de solutions de polymères utilisés en récupération assistée des hydrocarbures -Les polymères hydrosolubles comme les polyacrylamides peuvent être utilisés en récupération assistée des hydrocarbures (Enhanced Oil Recovery (EOR)) par injection de polymère. Cette technique vise à augmenter la production de brut en le poussant du réservoir vers un puits producteur à l'aide d'une solution de polymère suffisamment visqueuse. Les polymères utilisés à cet effet ont des masses moléculaires supérieures à 10 6 g/mol, ce qui les rend sensibles à la dégradation. En raison des débits élevés utilisés lors de leur injection, mais aussi en raison des taux d'élongation élevés rencontrés dans le réservoir, les polymères peuvent se rompre et perdre leurs propriétés viscosifiantes. Dans la littérature, il a été clairement montré, pour des solutions diluées en régime laminaire, que la dégradation des macromolécules n'était initiée qu'au-delà d'un taux d'élongation critique noté ε · c , et que ce taux d'élongation était une fonction puissance de la masse moléculaire du polymère : ε · c ≈ M w -k . La présente étude expérimentale de la dégradation mécanique a été menée sur des solutions d'oxydes de polyéthylène pour comprendre la dégradation mécanique non seulement en écoulement laminaire ou turbulent, mais aussi en régime dilué et semi-dilué, ainsi qu'en bon ou mauvais solvant. Il a été mis en évidence que la dégradation mécanique affecte principalement les longues chaînes, qu'elle est favorisée à concentrations élevées et en mauvais solvant. Les résultats montrent également que la décroissance de la viscosité élongationnelle à faibles taux de déformation, due à la dégradation, est semblable à celle de la viscosité de cisaillement ; elle est en revanche beaucoup plus marquée à forts taux d'élongation. Abstract

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Hindered diffusion of flexible polymers through polyimide ultrafiltration membranes

Beerlage¹,

Peeters²,

Nolten³

et al. 2000

J. Appl. Polym. Sci.

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ABSTRACT:The hindered diffusion of polystyrene in dilute solutions of ethyl acetate through polyimide ultrafiltration membranes has been investigated. The present system did not show specific membrane-solute interactions; furthermore, polystyrene can be considered as a flexible polymer coil. It is shown that the hindered diffusive permeability for monodisperse dilute solutions for a series of molecular weights can be compared well with the diffusive permeability curve of one polydisperse dilute polystyrene solution. In the case of very dilute solutions, the polymer coils have no interaction with each other, and the whole range of molecular-weight-dependent permeabilities can be determined from only one measurement. The diffusion behavior of polydisperse solutions through various polyimide membranes has been investigated as well. It was found that the diffusive permeability curve is strongly dependent on the type of membrane, that is, on the pore size distribution. It was not possible to calculate a pore size distribution from diffusion experiments due to mathematical limitations. Nevertheless, it was shown that hindered diffusion measurements are useful to estimate a maximum pore size for each membrane.

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Degradation of semidilute polymer solutions in elongational flows

Cited by 41 publications

References 15 publications

Flow-induced polymer degradation probed by a high throughput microfluidic set-up

Flow-induced polymer degradation probed by a high throughput microfluidic set-up

Mechanical Degradation Onset of Polyethylene Oxide Used as a Hydrosoluble Model Polymer for Enhanced Oil Recovery

Hindered diffusion of flexible polymers through polyimide ultrafiltration membranes

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