Berlin 2015 – scientific programme
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DF: Fachverband Dielektrische Festkörper
DF 19: Glasses and Glass Transition II (CPP with DF/DY)
DF 19.5: Talk
Friday, March 20, 2015, 10:30–10:45, C 243
Structure and Dynamics of Asymmetric Poly(styrene-b-1,4-isoprene) Diblock Copolymer under 1D and 2D Nanoconfinement — •Wycliffe K. Kipnusu1, Mahdy M. Elmahdy1, Emmanuel U. Mapesa1, Jiangi Zhang2, Detlef-M. Smilgies3, Christine M. Papadakis4, and Friedrich Kremer1 — 1Institute of Experimental physics I, Linnstr.5, 04103, Leipzig — 2National Center for Nanoscience and Technology (NCNST), No.11 ZhongGuanCun BeiYiTiao, 100190 Beijing, P.R. China. — 3Cornell High Energy Synchrotron Source (CHESS), Wilson Laboratory, Cornell University, Ithaca, NY 14853, USA — 4Technische Universität Müunchen, Physik-Department, Physik weicher Materie, James-Franck-Straße 1, 85748 Garching, Germany.
The impact of 1-and 2-dimensional (2D) confinement on the structure and dynamics of poly(styrene-b-1,4–isoprene) P(S-b-I) diblock copolymer is investigated by a combination of Grazing–Incidence Small–Angle X–ray Scattering (GISAXS), Atomic Force Microscopy (AFM) and Broadband Dielectric Spectroscopy (BDS). 1D confinement is achieved by spin coating the P(S-b-I) to form nanometric thin films on silicon substrates, while in the 2D confinement, the copolymer is infiltrated into cylindrical anodized aluminum oxide (AAO) nanopores. GISAXS and AFM reveal hexagonally packed cylinders of PS in a PI matrix.The dynamic glass transition of the styrene and isoprene blocks is independent of the dimensionality and the finite sizes (down to 18 nm) of confinement but the normal mode is influenced by both factors with 2D geometrical constraints exerting greater impact.