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Werner, S. ; Pospiech, D. ; Jehnichen, D. ; Eckstein, K. ; Komber, H. ; Friedel, P. ; Janke, A. ; Näther, F. ; Reuter, U. ; Voit, B. ; Taurino, R. ; Messori, M.
Synthesis and phase-separation behavior of a,v-difunctionalized diblock copolymers

A series of diblock copolymers of n-pentyl methacrylate and methyl methacrylate (PPMA/PMMA BCP) with one or two terminal functional groups was prepared by sequential anionic polymerization of PMA and MMA using an allyl-functionalized initiator and/or and end-capping with allyl bromide. Allyl functional groups were successfully converted into OH groups by hydroboration. The morphology in bulk was examined by temperature-dependent small-angle X-ray measurements (T-SAXS) and transmission electron microscopy (TEM) showing that functional groups induced a weak change in d-spacings L0 as well as in the thermal expansion behavior. T-SAXS proved that the lamellar morphologies were stable over multiple heating/cooling cycles without order-disorder transition (ODT) until 300 °C. While non-functionalized BCP formed parallel lamellae morphologies, additional OH-termination at the PMMA block forced in very thin films (ratio between film thickness and lamellar d-spacing below 1) the generation of perpendicular lamellae morphology through the whole film thickness, as shown by Grazing-incidence small-angle X-ray scattering experiments (GISAXS) measurements. Functionalized BCP were successfully used in thin films as templates for silica nanoparticles in an in-situ sol–gel process. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011

Journal of Polymer Science: Part A: Polymer Chemistry 49



Erschienen am
January 2011

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