Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: Nanoparticles and Composite Materials

CPP 8.35: Poster

Monday, March 26, 2012, 17:30–20:00, Poster A

Structure-property relationship of Nanocomposites based on Polylactide and Layered Double Hydroxide — •Purv Purohit and Andreas Schönhals — BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany

Nanocomposites based on biopolymer Polylactide (PLA) and organically modified MgAl Layered Double Hydroxide (MgAl-LDH) were prepared and investigated by a combination of differential scanning calorimetry (DSC), Small and Wide angle X-ray scattering (SAXS & WAXS) and Dielectric Relaxation Spectroscopy (DRS). DSC and WAXS show that the degree of crystallinity is influenced by the content of LDH. The dielectric response of the nanocomposites shows several relaxation processes. The intensity of the dynamic glass transition increases with the concentration of LDH. This is attributed to the increasing concentration of the exchanged anion sodium dodecylbenzene sulfonate (SDBS), which are adsorbed at the LDH layers. Two processes are identified at lower and higher temperatures both having a signature of the dynamic glass transition. The process at lower temperature originates from polymer segments close to the LDH whereas the one at higher temperature (bulk like) from the molecules at a farther distance from the LDH. Other than these two processes, β relaxation is identified which is related to localized fluctuations in the polymer chain.