Berlin 2015 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 43: P8: Nanoparticles and Compsite Materials

CPP 43.9: Poster

Wednesday, March 18, 2015, 10:00–13:00, Poster A

Gastransport Properties and Molecular Mobility of Matrimid/PhenethylPOSS Nanocomposites — •Nora Konnertz, Martin Boehning, and Andreas Schoenhals — BAM Federal Institute of Materials Research and Testing, Unter den Eichen 87, 12205 Berlin

Polymers are favored materials for gas separation membranes. The development of new material with higher permeabilities and selectivities is challenging because the structure and property optimization follows a trade-off: improvements of permeability is often connected to a reduction in selectivity and vice versa. A promising approach for improvements is the incorporation of nanoscaled fillers. In order to understand thus induced changes in the solution-diffusion mechanism (which describes the gas transport through polymer membranes) in more detail it is important to relate the molecular mobility of the polymer in the nanocomposites with the gas transport properties. Here this relation is studied using Matrimid5218 as polymer matrix and a polyhedral oligomeric silsesquioxane with phenethyl substituents (PhenethylPOSS) as nanofiller. Films with filler contents up to 20 wt% were casted from dichloromethane solution (thicknesses around 100 μm). The molecular mobility is determined by broadband dielectric spectroscopy. Permeabilities were measured with the time-lag method (0 - 20 bar) and sorption by using a microbalance (0 - 45 bar) for different gases.