456333 Photoswitchable Nanomaterials Via Ordered Self-Assembly of Monodisperse Oligodimethylsiloxanes

Thursday, November 17, 2016: 4:30 PM
Golden Gate 2 (Hilton San Francisco Union Square)
R. Helen Zha1, Bas de Waal2, Ronald Gosens2, José Berrocal1 and E.W. Meijer1,2, (1)Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, Netherlands, (2)Department of Chemical Engineering & Chemistry, Eindhoven University of Technology, Eindhoven, Netherlands

Phase separation in segmented macromolecules such as block copolymers has emerged as a powerful tool for the fabrication of well-ordered nanomaterials. Here, we present a class of monodisperse azobenzene-functionalized oligodimethylsiloxanes (AzoODMS) which self-assemble to form multi-domain nanomaterials with sub-7nm periodicities. By balancing the effects of phase separation and directional endgroup aggregation, we can tailor the nature of self-assembly and obtain materials with drastically different morphologies. We show the importance of these morphologies in conferring bulk material properties. Using the trans-cis photoisomerization of azobenzene motifs, we further demonstrate the reversible photoactivated solid-liquid transition of AzoODMS arranged in bilayers or the rapid motion of AzoODMS arranged in hexagonally-packed cylinders.

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See more of this Session: Nanoscale Structure in Polymers
See more of this Group/Topical: Materials Engineering and Sciences Division