title: Localized soft elasticity in liquid crystal elastomers.
abstract: Synthetic approaches to prepare designer materials that localize deformation, by combining rigidity and compliance in a single material, have been widely sought. Bottom-up approaches, such as the self-organization of liquid crystals, offer potential advantages over top-down patterning methods such as photolithographic control of crosslink density, relating to the ease of preparation and fidelity of resolution. Here, we report on the directed self-assembly of materials with spatial and hierarchical variation in mechanical anisotropy. The highly nonlinear mechanical properties of the liquid crystalline elastomers examined here enables strain to be locally reduced >15-fold without introducing compositional variation or other heterogeneities. Each domain (⩾0.01 mm(2)) exhibits anisotropic nonlinear response to load based on the alignment of the molecular orientation with the loading axis. Accordingly, we design monoliths that localize deformation in uniaxial and biaxial tension, shear, bending and crack propagation, and subsequently demonstrate substrates for globally deformable yet locally stiff electronics.
authors.affiliation: Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA.|Department of Bioengineering, The University of Texas at Dallas, Richardson, Texas 75080, USA.
authors.forename: Taylor H
authors.initials: TH
authors.lastname: Ware
authors.affiliation: Cavendish Laboratory, Cambridge University, Cambridge CH3 0HE, UK.
authors.forename: John S
authors.initials: JS
authors.lastname: Biggins
authors.affiliation: Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA.
authors.forename: Andreas F
authors.initials: AF
authors.lastname: Shick
authors.affiliation: Cavendish Laboratory, Cambridge University, Cambridge CH3 0HE, UK.
authors.forename: Mark
authors.initials: M
authors.lastname: Warner
authors.affiliation: Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base, Ohio 45433, USA.
authors.forename: Timothy J
authors.initials: TJ
authors.lastname: White