Modeling diffusion through geomembranes

Fong, C. F. Chan Man; Moresoli, Christine; Xiao, Shuzhang; Li, Y.; Bovenkamp, John W.; Kée, D. De

doi:10.1002/(sici)1097-4628(19980314)67:11<1885::aid-app7>3.0.co;2-h

Cited by 15 publications

(2 citation statements)

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“…Contrary to controlled release technologies, efforts are devoted to developing a strong barrier to prevent the absorption of chemicals. Impermeable liners, such as geomembranes, are designed to reduce risks associated with the diffusion of pollutants in the environment ( [4]). To serve as effective sealants against contaminants, the mechanical properties of the membrane have to be well understood.…”

Section: Applications Of Polymeric Materialsmentioning

confidence: 99%

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Molecular Transport in Viscoelastic Materials: Mechanistic Properties and Chemical Affinities

Ferreira¹,

Oliveira²,

Silva³

et al. 2014

SIAM J. Appl. Math.

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The effects of mechanical properties and chemical affinities of materials on the transport of solutes were studied. Simulations show that the kinetics of permeant fluids in matrices depends on the rheological and chemical properties of the polymer. Fick's law failed to describe transport through viscoelastic materials because of the force exerted on the incoming fluid causing a delay. Reversible binding to immobilizing sites also retarded permeation of molecules. An integro-differential equation was applied to model transport in the presence of solute membrane interactions. While the differential part of the equation was represented by an elliptic operator, the integral part, composed of two integrals, described the contributions of stress and reversible binding. Using Laplace transforms, the steady-state flux and effective time constant were calculated. The latter parameter represents a statistical interpretation of the waiting time to achieve equilibrium in the system. The lag time, that defines the first moment when a detectable concentration is measured in a receiver cell, was also studied using multiple integration. Subsequent analyses revealed the dependence of the steadystate flux, the effective time constant, the lag time on the Young modulus, the viscosity and the binding/unbinding rates. The results presented in this paper make it possible to tune the mechanical and chemical properties to achieve a desired transport profile.

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Section: Applications Of Polymeric Materialsmentioning

confidence: 99%

“…To serve as effective sealants against contaminants, the mechanical properties of the membrane have to be well understood. Studies should also shed light on how chemicals are being transported through these polymeric sheets ( [4]) to prevent seepage of pollutants.…”

Section: Applications Of Polymeric Materialsmentioning

confidence: 99%

Molecular Transport in Viscoelastic Materials: Mechanistic Properties and Chemical Affinities

Ferreira¹,

Oliveira²,

Silva³

et al. 2014

SIAM J. Appl. Math.

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Influence of external stress on the barrier properties of rubbers

Kée

Fong

et al. 1999

J. Appl. Polym. Sci.

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ABSTRACT:The effect of an external stress on the barrier properties of natural, bromobutyl, and nitrile rubber were studied using a modified ASTM permeation method. Stress-induced changes such as a decrease in the breakthrough time with mechanical elongation was observed. Upon application of a small mechanical deformation, little change was observed in terms of steady-state permeation flux. On the other hand, a stress-enhanced diffusion was observed for most of the solvent/rubber pairs studied.

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Effect of temperature and elongation on the liquid diffusion and permeation characteristics of natural rubber, nitrile rubber, and bromobutyl rubber

Kée

Fong

Pintauro

et al. 2000

J. Appl. Polym. Sci.

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The diffusive properties of acetone, dichloromethane, and toluene in natural, nitrile, and bromobutyl rubber membranes at temperatures between 273 and 313 K and uniaxial elongations between 0 and 40% were investigated. As the temperature and elongation increase, the steady state flux increases, and the breakthrough time decreases. An increase in temperature leads to an increase in permeability, and small extensions do not cause significant changes in the diffusive properties. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 78: 1250–1255, 2000

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Modeling diffusion through geomembranes

Cited by 15 publications

References 0 publications

Molecular Transport in Viscoelastic Materials: Mechanistic Properties and Chemical Affinities

Molecular Transport in Viscoelastic Materials: Mechanistic Properties and Chemical Affinities

Influence of external stress on the barrier properties of rubbers

Effect of temperature and elongation on the liquid diffusion and permeation characteristics of natural rubber, nitrile rubber, and bromobutyl rubber

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