title: Shear-induced orientation of gyroid PS-b-P4VP(PDP) supramolecules.
abstract: The phase behavior of block copolymer based supramolecular complexes polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and amphiphilic pentadecylphenol (PDP) molecules resembles the phase behavior of conventional block copolymers. Several PS-b-P4VP(PDP) complexes are found to self-assemble into gyroid nanostructures. Typically, the grains are randomly oriented with a maximal size of several micrometers. Here, the orientation of a gyroid PS-b-P4VP(PDP) complex upon shearing is reported. It is found that the (111) gyroid lattice direction orients parallel to the shear direction after only several seconds of large amplitude oscillatory shearing. Oriented gyroid complexes can be used as templates for the preparation of metal nanofoams with improved ordering with potentially superior properties.
authors.affiliation: Department of Polymer Chemistry, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747, AG, Groningen, The Netherlands.
authors.forename: Ivana
authors.initials: I
authors.lastname: Vukovic
authors.forename: Heiner
authors.initials: H
authors.lastname: Friedrich
authors.forename: Daniel Hermida
authors.initials: DH
authors.lastname: Merino
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Portale
authors.forename: Gerrit
authors.initials: G
authors.lastname: Ten Brinke
authors.forename: Katja
authors.initials: K
authors.lastname: Loos
mesh_terms: D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D011137:Polystyrenes / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D033081:Shear Strength; D013314:Stress, Mechanical
chemical_list: D011137:Polystyrenes; D011145:Polyvinyls; D011725:Pyridines; C509607:polystyrene-block-poly(4-vinylpyridine)
keywords: block copolymers; gyroid morphology; oscillatory shearing; shear-induced ordering; supramolecular complexes