Berlin 2012 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 31: Organic thin films I
DS 31.5: Vortrag
Donnerstag, 29. März 2012, 12:15–12:30, H 0111
Characterization of inorganic Surfaces modified by thiol-ene Polymer Grafting — •Christian Kuttner1, Moritz Tebbe1, Michaela Eder2, Helmut Schlaad2, Ingo Burgert2,3, and Andreas Fery1 — 1Physical Chemistry II, Bayreuth University, 95447 Bayreuth, Germany — 2Max-Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany — 3ETH Zurich, Institute for Building Materials & Empa, Wood Lab, 8093 Zurich, Switzerland
Control of the interfacial properties is crucial for inorganic-organic composites. We studied interactions between inorganic surfaces grafted with macromolecules and a given epoxy matrix. The aim was to develop a better understanding of adhesion principles in (fiber-reinforced) composites and thus optimizing composites.
Thiol-ene grafting was utilized to introduce a polymeric gradient on silica-like surfaces following a two-step approach by Schlaad et al. [1], which allows initiator-free grafting of macromolecules. Different grafting-techniques were tested for applicability and adapted to modify fiberglass. The resulting coatings were nano-structurally and nano-mechanically characterized. Layer morphology (AFM, SEM, SE) and swelling behavior (SE) were investigated. After embedding the modified fibers in an epoxy matrix, cross-sections were prepared for force-volume analysis. The stiffness distribution at the fiber-matrix interface was investigated. The interfacial shear strength between modified fibers and the epoxy matrix was measured by a pull-out experiment to benchmark the non-covalent fiber-matrix construction.
[1] Bertin A, Schlaad H; Chem. Mater. 2009, 21 (24), 5698