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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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Kasten mit drei Einzelabbildungen in Farbe und Beschriftung
Shrinkage and Degradation increase with increasing Pressure

New Thermoset Capillary Rheometer (TCR) to evaluate Flow and Thermal Behavior of Thermosets

To evaluate flow and thermal properties of thermosetting materials at pressures comparable to processing operations, a new Thermoset Capillary Rheometer (TCR) is introduced. Material viscosity is measured before curing and during curing. This is used to determine the curing curve and gel time. Depending on the mold temperature, some compounds show decrease in pressure due to shrinkage whereas some other materials show increase in pressure due to degradation. As the pressure increases, shrinkage and degradation decrease. Thermal behavior of the compound during curing is monitored with gradient temperature sensors. The time at which the maximum exothermic peak happens correlates with curing speed.

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