Page 15 - Solutions for Plastic Evaluation

Additives Evaluation of Raw Materials

Thermal Analysis

Quantitation of Reinforcing Materials in Epoxy Resins

Quartz and other reinforcing materials in plastics are quantitated Plastic Materials Evaluation of
based on the quantity remaining after heating the sample in air until
the resin components are completely combusted. In this example,
the quantity of quartz in epoxy resin is quantitatively analyzed.
When the sample was heated in air, the epoxy resin was completely
combusted by 600°C and the weight decreased by 33.83%.
The concentration of quartz was calculated as 100 - 33.83 =
66.17%. Raw Materials
On the DTA curve, the transition of quartz was measured at Evaluation of
580°C, along with the endothermic and exothermic peaks due to
decomposition and combustion of the epoxy resin between 300 and
600°C.

Quantitation of Carbon Black in SBR Product Evaluation
The quantity of carbon black in resin is measured by heating the
resin and switching from a nitrogen atmosphere to air. In the figure
to the left, the amount of carbon black contained in SBR was
quantitated. First the SBR was heated in a nitrogen atmosphere
to decompose all components of the rubber other than carbon
black. After completely decomposing the SBR by heating to about
600°C, the atmosphere was switched to air. When the carbon Product Information
black combusted in air, the total decrease in weight was observed
and the carbon content was quantitated from the percentage
decrease. In the figure to the left, this resulted in a quantitated
value of 28.2%. Note, however, that combusting carbon black
generates residual inorganic matter.

Configuration of DTG Gas Flow Lines

Due to its unique gas flow line configuration, the Shimadzu
DTG-60 thermal analyzer can be used for a wide variety of
measurement applications. For measurements in inert gas, the
vacuum pump exhaust is utilized to displace the gas quickly. The
gas inlet is located near the sample, so that it is also possible to
measure samples with active gas flowing only to the sample area,
while keeping the separate balance area protected with inert gas.

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