Suction of hydrosoluble polymers into nanopores
Résumé
Forced penetration of large hydrosoluble polymer chains through track-etched membranes has been
investigated as a function of both solvent flow rate in the pores and the ratio of polymer hydrodynamic
radius to pore radius. We measure the rejection coefficient R_obs from retentate and permeate mean
concentrations, and its corrected value R including polymer accumulation at the membrane. The
variations of R as a function of solvent flow rate per pore in adimensional units collapse into the same
curve well fitted by de Gennes’ ‘‘suction model’’. This curve, universal for flexible polymers in good
solvents, leads to an estimate of the critical penetration flow.
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