Regensburg 2013 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 64: Nanomaterials - Miscellaneous
MM 64.4: Talk
Thursday, March 14, 2013, 18:00–18:15, H25
Morphology of Fiber-Coatings by Thiol-Ene Photochemisty and their Mechanical Properties at the Interface — •Christian Kuttner1, Michaela Eder2, Helmut Schlaad3, Ingo Burgert4, and Andreas Fery1 — 1Physical Chemistry II, University of Bayreuth, 95447 Bayreuth, Germany — 2Max-Planck Institute of Colloids and Interfaces, Department of Biomaterials, 14424 Potsdam, Germany — 3Max-Planck Institute of Colloids and Interfaces, Colloid Chemistry, 14424 Potsdam, Germany — 4ETH Zürich, Institute for Building Materials & Empa, Wood Lab, 8093 Zürich, Switzerland
Control of the interfacial properties is crucial for inorganic-organic composites. We studied the interfacial adhesion between inorganic surfaces grafted with macromolecular coatings 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 photochemistry was utilized to introduce a polymeric gradient on silica-like surfaces following a two-step approach by Schlaad et al. without additional initiator. Two grafting-techniques were applied: "Grafting-from" polymerization resulted in brush-like homopolymer films, whereas, "grafting-onto" deposition was suitable for diblock copolymer attachment. Both techniques were adapted to modify fiberglass. The resulting coating morphologies were nanostructurally characterized (AFM, SEM, SE, TGA). The interfacial shear strength of modified fibers in an epoxy matrix was measured by a single fiber pull-out experiment to benchmark the non-covalent fiber-matrix construction.