Forschung Zur Rubrik

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Zwei Balkendiagramme mit hell- und dunkelgrünen Balken.
Process Temperature and Mass Content of the added TEM have a significant Influence on the Foam density Reduction

Investigation of the Foam Density Development of EPDM Rubber Foam using Thermoplastic ­Expandable Microspheres

The aim of these experimental investigations is to understand the potential for reducing foam density by the amount of Thermoplastic Expandable Microspheres (TEM) used as foaming agent, the processing temperature and the viscosity of the rubber. Two EPDM-based rubber compounds that are processed in injection moulding and ex-trusion processes, and therefore have different viscosities, have been the subject of investigation. A Sponge Rubber Analyzer is used to determine the time-dependent reduction and thus the lowest achievable foam density. It was shown that the process temperature and the mass content of TEM added had a significant influence on the foam density reduction.

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TEM image of Fe3O4 nanoparticles prepared by co-precipitation method.
XRD Examination shows an Increase in Crystallization

Structural and Physical Properties of Poly Methyl Methacrylate / Magnetite Nanocomposites

The casting technique was used for the preparation of poly methyl methacrylate (PMMA) nanoparticles at different concentrations of Fe3O4. SEM indicated a precise distribution of Fe3O4 particles in the PMMA matrix up to 10 wt%. XRD reveals an increase in crystallization by increasing the Fe3O4 content. The dielectric parameters ε‘ and ε“ were found to increase gradually by increasing Fe3O4 content up to 10 wt% followed by an abrupt increase. The electrical conductivity σdc at 30 °C was found to be in the order of 10-9 S cm-1 which recommends such composites to be used as antistatic materials. On the other hand, the values of σdc at 90 °C was found to be in the order of 10-3 S cm-1 which behave like semiconductor at such high temperature.

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