Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 64: Nanostructures, Nanostructuring and Nanosized Soft Matter II
CPP 64.4: Vortrag
Donnerstag, 15. März 2018, 10:15–10:30, PC 203
The influence of interfacial adhesion between a dispersed inorganic phase and a polymer matrix on the overall mechanical properties of composite materials — •Dorothee Silbernagl1, Media Ghasem Zadeh Khorasani1, and Heinz Sturm1, 2 — 1BAM, Berlin, Germany — 2TU Berlin, Berlin, Germany
The overall mechanical properties of composites are considered to correlate with the mechanical properties of the constituents, i.e. matrix phase (MP) and inorganic dispersed phase (DP). In the case of a MP, e.g. epoxy, which polymerizes in the presence of a DP, the mechanical properties of the interphase (IP), the organic matter in proximity to the filler particle, has to be taken into account. We show the major influence of a third parameter: the interfacial adhesion (IA) between MP and DP. In order to make this effect measurable a nanoparticle based composite was geometrically reduced to a substrate representing the DP and a thin polymer film (10 - 100 nm), representing the MP. Substrates with differently modified moieties enhancing or impeding the IA are used. Mechanical properties of such layered samples (silicon/PnBMA and boehmite/anhydride-cured epoxy) were measured by AFM force-distance curves (FDC), applying forces perpendicular to the interface. FDC curves show significant changes in deformation rates depending on the IA. This implies unexpected long range effect exceeding the effect of an IP.