Dynamic relaxations of polymers in mixed solvents

Negadi, Amina; Vilgis, Thomas A.; Benmouna, M.

doi:10.1002/1521-3919(20001101)9:8<628::aid-mats628>3.0.co;2-v

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…When D becomes comparable to the chain size, then the shift of the Θ temperature is determined by t ≅ b / R Gauss , which is simply $t \propto 1/\sqrt N$ , as it must be the case for the collapse of polymer chains in bulk. The geometry dependence of the Θ temperature has recently been studied for a polymer confined between two parallel plates (slit geometry) by using numerical methods 9–12. For completeness, we would like to remark that naive scaling for a simple slit geometry predicts t c,slit = ( b / D ) 0 , which suggests a logarithmic dependence, t c,slit ∝ log( D / b ), but this needs further investigation.…”

Section: Nanoporesmentioning

confidence: 99%

Chains in Critical Fluids and Nanopores

Negadi¹,

Dua²,

Vilgis³

2004

Macro Theory & Simulations

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Summary: The conformational behavior of a polymer in a critical binary solvent confined in a porous medium is studied. The size of the polymer in bulk, which is mainly governed by the correlation length of the solvent density fluctuations, depends on the proximity to the critical point of the binary mixture. We find that in contrast to the bulk behavior, the conformational properties of the polymer in a porous medium depends strongly on the pore size. The latter controls the correlation length of the solvent density fluctuations and thus determines the polymer size.

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Section: Nanoporesmentioning

confidence: 99%

Chains in Critical Fluids and Nanopores

Negadi¹,

Dua²,

Vilgis³

2004

Macro Theory & Simulations

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Diffusion constants of polymers in mixed solvents

Negadi

Benmouna

Vilgis

2004

J Polym Sci B Polym Phys

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Dynamics of polymers in mixed solvents are investigated on the basis of linear response theory and mean field arguments. Particular attention is given to the coupling between polymer and fluid fluctuations. This coupling is enhanced by polymer–solvent interaction asymmetry and mixed solvent incompatibility. Cooperative and fluid diffusion constants are analyzed in terms of the interactions in the medium and some predictions for light scattering experiments are made. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 42: 3976–3980, 2004

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