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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: POSTERS Polymerphysics

CPP 34.42: Poster

Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A

Dielectric Properties of nanocomposites based on polyethylene and layered double hydroxide — •Andreas Schönhals¹, Francis Reny Costa², Udo Wagenknecht², and Gert Heinrich² — ¹Federal Institute of Materials Research and Testing (BAM), Unter den Eichen 87, D-12205 Beerlin — ²Leibniz Institute of Polymer Research, Hohe Straße 6, D-01069 Dresden

Polymer based nanocomposites continue to receive tremendous attention for different applications. They show remarkable property improvement (increased tensile properties, decreased gas permeability, decreased solvent uptake, increased thermal stability and flame retardance) when compared to conventionally scaled composites. The dielectric properties of nanocomposites based on Mg / Al layered double hydroxide (LDH) as nanofillers and polyethylene (PE) as matrix are investigated by dielectric spectroscopy (10 mHz to 10 MHz) in a large temperature range. One dielectric active relaxation processes is observed which increases in its intensity with the concentration of the incooperated LDH. It is assigned to the segmental relaxation of PE segments which fluctuate together with the surfactant. The polar surfactant used for the interaction/exfoliation enables to observe the molecular motions of the apolar PE segments located close to the LDH sheets. A quantitative analysis provides information about the amount of the interfacial region between the inorganic LDH sheets and the bulk PE matrix.