title: Orientability of the minor director of homeotropically aligned smectic-a elastomers in external mechanical fields.
abstract: We present studies on bulk smectic-A copolymer networks with end-on attached homeotropically oriented mesogens that show spontaneous optical biaxiality at room temperature. Orthoscopic and conoscopic investigations under uniaxial extension in the layer planes give first evidence of the orientability of the minor director in mechanical fields yielding biaxial monodomains with 3-d orientational long-range order of all three principle axes. This is an important step towards the synthesis of permanently oriented biaxial monodomain elastomers for which highly interesting mechanical and optical properties are expected.
authors.affiliation: Institut für Makromolekulare Chemie, Freiburg i. Br., Germany. felictas.broemmel@bristol.ac.uk
authors.forename: Felicitas
authors.initials: F
authors.lastname: Brömmel
authors.forename: Dominic
authors.initials: D
authors.lastname: Kramer
authors.forename: Benjamin P
authors.initials: BP
authors.lastname: Brown
authors.forename: Heino
authors.initials: H
authors.lastname: Finkelmann
authors.forename: Anke
authors.initials: A
authors.lastname: Hoffmann
mesh_terms: D020724:Elastomers / Q000737:chemistry*; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D020724:Elastomers