Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 43: P8: Nanoparticles and Compsite Materials
CPP 43.1: Poster
Mittwoch, 18. März 2015, 10:00–13:00, Poster A
The Effect of preparation method on the physical properties and the dynamic glass transition of the nanocomposites based on hyperbranched polymers — •Shereen Omara1, Mona Abdel Rehim2, Ahemd Ghoneim3, Sherif Madkour1, Gamal Turky3, and Andreas Schönhals1 — 1Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, D-12200 Berlin, Germany — 2Packing and Packaging Materials Department, National Research Center, Cairo, Egypt — 3Microwave Physics and Dielectrics Department,National Research Center, Cairo, Egypt
Broadband dielectric spectroscopy, Specific heat spectroscopy, and Differential scanning calorimetry (DSC) are combined to study the glass transition and segmental motions in hyperbranched polyamine ester (HB PAE) and its nanocomposite with kaolinite (Ka). In situ polymerization and solution mixing (Ex situ) are applied to prepared HBPAE/Ka nanocomposites with different concentrations of Ka.The dielectric spectra are dominated on the lower frequency (higher temperature) side by conductivity contribution. The molecular dynamic is found to be screened out by the conductivity contribution; otherwise Specific heat spectroscopy was used to determine the dynamic glass transition temperature of HBPs/Ka nanocomposite. The segmental motion related to the glass transition called alpha process found to play a role in the charge transport. The result indicated that the dc conductivity and the dynamic glass transition temperature depend not only on different concentrations of kaolinite but also on the method of the preparation of the nanocomposite.