Large amplitude oscillatory shear of block copolymer spheres on a body-centered cubic lattice: Are micelles like metals?

Maria A. Torija, Soo Hyung Choi, Timothy P. Lodge, Frank S. Bates

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Small-angle X-ray diffraction experiments have uncovered a remarkable mechanism of grain alignment during plastic deformation of ordered sphere-forming diblock copolymer micelles when subjected to large amplitude dynamic shearing. A nearly monodisperse poly(styrene-b-ethylene-alt-propylene) (SEP) diblock copolymer with block molecular weights of 42 000 and 60 000 was mixed with squalane (C30H62), an EP selective solvent, at a concentration of 10 wt %. After high temperature annealing, the sample formed an ordered polydomain morphology containing glassy S cores at room temperature. SAXS powder patterns confirm body-centered cubic (BCC) symmetry and reveal the development of a complex array of two-dimensionally resolved Bragg reflections following the application, and cessation, of oscillatory shearing. These diffraction results are interpreted on the basis of the classic mechanism of crystalline slip, which accounts for plastic deformation of ductile materials such as metals. Four distinct slip systems are shown to be active in this work, suggesting a robust basis for deforming and mixing of soft ordered solids.

Original languageEnglish (US)
Pages (from-to)5840-5848
Number of pages9
JournalJournal of Physical Chemistry B
Volume115
Issue number19
DOIs
StatePublished - May 19 2011

Fingerprint Dive into the research topics of 'Large amplitude oscillatory shear of block copolymer spheres on a body-centered cubic lattice: Are micelles like metals?'. Together they form a unique fingerprint.

  • Cite this