Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.31: Poster
Montag, 12. März 2018, 17:30–19:30, Poster A
Structure-Property Relationships of Hyperbranched Polyamine ester/Ka-DCA nanocomposites. — •Shereen Omara1,2, Mona H Abdel Rehim2, Gamal Turky2, Sherif Madkour1, and Andreas Schönhals1 — 1Bundesanstalt für Materialforschung und-prüfung (BAM), — 2National Research Centre (NRC), 33 El Behouth St., Dokki, Giza, P.O.12622, (Egypt)
Hyperbranched polyamine ester (HPAE)/ kaolinite nanocomposites were papered via an ex situ (solution-based) method. The kaolinite has been modified by dodecylamine (DCA). SAXS measurements revealed that the Ka interlayer space increased from 0.71 to 3.6 nm-1. A partly exfoliated structure of the HPA/Ka-DCA nanocomposites was proved by SAXS and TEM. By a combination of BDS and SHS, the relaxation properties of the nanocomposites were investigated in dependence on frequency and temperature. The activation energies of γ-relaxation for the nanocomposites were lower than the values found for the pure HPAE. The segmental dynamics (α- relaxation) was found to be screened out by the conductivity contribution, while it was retrieved by SHS employing AC-chip calorimetry. The confinement effect of the Ka-DCA nanofillers reduces the glass transition temperature Tg and enhances, meanwhile, the electrical conductivity of the polymer. By comparing the temperature dependence of the dynamic glass transition measured with SHS and that of the dc conductivity measured by BDS, a decoupling in their temperature dependencies was found.