Glossary
Filler content analysis – e.g., Carbon Black and Ash Content
Thermogravimetry (TG or thermogravimetric analysis, TGA) is the most common method for determining the filler content, e.g., Carbon BlackTemperature and atmosphere (purge gas) affect the mass change results. By changing the atmosphere from, e.g., nitrogen to air during the TGA measurement, separation and quantification of additives, e.g., carbon black, and the bulk polymer can become possible.carbon black, within a polymer, e.g., rubber material. The type and quantity of filler in a polymer influences the performance of the polymer.
The polymer sample is placed in a crucible, put on a balance inside of the TGA furnace, and heated. The test parameters such as temperature program and atmosphere depend on the filler material: Organic fillers can be oxidized; inorganic fillers can be inert, non-oxidizable or reactive. In case of an inorganic filler, e.g., glass fiber, in a polymer matrix, a typical temperature program for aTGA measurement would be as follows: at first, heating under nitrogen atmosphere up to 850°C for Decomposition reactionA decomposition reaction is a thermally induced reaction of a chemical compound forming solid and/or gaseous products. decomposition of the polymer matrix and then further heating under oxidizing atmosphere for burning the pyrolytic soot and eventually other remaining oxidizable components. The residual mass will be the inorganic filler – in this case the glass fiber.
In case of organic fillers, a separation of filler and polymer matrix can be achievable if the two (organic) components have a different Decomposition reactionA decomposition reaction is a thermally induced reaction of a chemical compound forming solid and/or gaseous products. decomposition temperature. In addition, the two Decomposition reactionA decomposition reaction is a thermally induced reaction of a chemical compound forming solid and/or gaseous products. decomposition processes should be independent of each other.
TGA delivers the quantity of the residual mass or Ash ContentThe ash is a measure of the mineral oxide content on a weight basis. Thermogravimetric analysis (TGA) in an oxidative atmosphere is a well-proven method to determine the inorganic residue, commonly referred to ash, in organic materials such as polymers, rubbers, etc. Therefore, the TGA measurement will identify if a material is filled and calculates the total filler content.ash content (in e.g., percentage/% or mass/mg) or in other words what remains from the initial amount of material tested. In general, TGA is suitable to analyze the composition of a material. There are many possible ways to carry out TGA measurements.
