EXTENSION AND COMPRESSION OF GRAFTED POLYMER LAYERS IN STRONG NORMAL FLOWS

J L HARDEN, Michael Cates

Research output: Contribution to journalArticlepeer-review

Abstract

We study the deformation of polymer brushes grafted to porous substrates in strong permeation flows normal to the grafting surface. Our model predicts a strong deformation regime for both compressive and extensive permeation flows of sufficiently high solvent how rates. These regimes are characterized by non-linear scaling of brush thickness L with molecular weight N and solvent velocity V and by non-linear scaling of solvent velocity V with the pressure drop Delta P across the brush. For the case of strong brush extension, L similar to (NV2)-V-3, as in the case of isolated chains in uniform solvent flows, and V similar to Delta P-1/3; while for strong brush compression, L similar to (NV-4/13)-V-9/13 and V similar to Delta P-13/15.

Original languageEnglish
Pages (from-to)1093-1103
Number of pages11
JournalJournal de physique ii
Volume5
Issue number7
DOIs
Publication statusPublished - Jul 1995

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