Berlin 2008 – wissenschaftliches Programm
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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.