Polymer Brush Collapse under Shear Flow

Korolkovas, AiridasInst Laue Langevin, 71 Rue Martyrs, F-38000 Grenoble, France.;Univ Grenoble Alpes, Liphy, 140 Rue Phys, F-38402 St Martin Dheres, France. (author)

Shear responsive surfaces offer potential advances in a number of applications. Surface functionalization using polymer brushes is one route to such properties, particularly in the case of entangled polymers. We report on neutron reflectometry measurements of polymer brushes in entangled polymer solutions performed under controlled shear as well as coarse-grained computer simulations corresponding to these interfaces. Here we show a reversible and reproducible collapse of the brushes, increasing with the shear rate. Using two brushes of greatly different chain lengths and grafting densities, we demonstrate that the dynamics responsible for the structural change of the brush are governed by the free chains in solution rather than the brush itself, within the range of parameters examined. The phenomenon of the brush collapse could find applications in the tailoring of nanosensors and as a way to dynamically control surface friction and adhesion.

Rodriguez-Emmenegger, CesarRhein Westfal TH Aachen, DWI Leibniz Inst Interact Mat, Forckenbeckstr 50, D-52074 Aachen, Germany.;Rhein Westfal TH Aachen, Inst Tech & Macromol Chem, Forckenbeckstr 50, D-52074 Aachen, Germany.;Univ Sheffield, Dept Phys & Astron, Sheffield S10 2TN, S Yorkshire, England. (author)
Pereira, Andres de los SantosAcad Sci Czech Republic, Inst Macromol Chem, Vvi, Heyrovsky Sq 2, CR-16206 Prague, Czech Republic. (author)
Chenneviere, AlexisUniv Paris Saclay, CNRS, CEA, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France. (author)
Restagno, FredericUniv Paris Saclay, Univ Paris Sud, CNRS, Phys Solides Lab, F-91405 Orsay, France. (author)
Wolff, MaximilianUppsala universitet,Materialfysik(Swepub:uu)maxwo643 (author)
Adlmann, FranzUppsala universitet,Materialfysik(Swepub:uu)fraad979 (author)
Dennison, Andrew J. C.Inst Laue Langevin, 71 Rue Martyrs, F-38000 Grenoble, France.;Tech Univ Berlin, Dept Chem, D-10623 Berlin, Germany. (author)
Gutfreund, PhilippInst Laue Langevin, 71 Rue Martyrs, F-38000 Grenoble, France. (author)
Inst Laue Langevin, 71 Rue Martyrs, F-38000 Grenoble, France.;Univ Grenoble Alpes, Liphy, 140 Rue Phys, F-38402 St Martin Dheres, France.Rhein Westfal TH Aachen, DWI Leibniz Inst Interact Mat, Forckenbeckstr 50, D-52074 Aachen, Germany.;Rhein Westfal TH Aachen, Inst Tech & Macromol Chem, Forckenbeckstr 50, D-52074 Aachen, Germany.;Univ Sheffield, Dept Phys & Astron, Sheffield S10 2TN, S Yorkshire, England. (creator_code:org_t)

In:Macromolecules: American Chemical Society (ACS)50:3, s. 1215-12240024-92971520-5835

By the author/editor: Korolkovas, Airi ...; Rodriguez-Emmene ...; Pereira, Andres ...; Chenneviere, Ale ...; Restagno, Freder ...; Wolff, Maximilia ...; show more...; Adlmann, Franz; Dennison, Andrew ...; Gutfreund, Phili ...; show less...

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