Thermogravimetric analysis (TGA) is a standard method for quantitatively analyzing the components of composites by precisely measuring the mass changes of a sample under programmed temperature control. In new material development and quality control, the data provided by TGA often serves as a key basis for formulation optimization.

Four major applications of TGA in composites:

1. Filler content determination: Using a stepwise heating program in nitrogen/air, organic matrices decompose in nitrogen and carbon black and organic residues burn off in air, leaving inorganic fillers. For polymer-based composites as an example: 20-600°C (N2) weight loss = polymer + plasticizer, 600-900°C (Air) weight loss = carbon black, 900°C residue = inorganic filler.

2. Plasticizer and volatile content: Weight loss in the low-temperature range (room temperature to 250°C) corresponds to small molecule volatiles and plasticizer content, which is an important indicator for evaluating material aging and compliance.

3. Thermal stability and service life prediction: By analyzing decomposition temperatures at different heating rates and using Kissinger or Flynn-Wall-Ozawa methods to calculate decomposition activation energy, the material's service life at different temperatures can be predicted.

4. Composition consistency verification: Comparing TGA fingerprints of incoming batches allows quick detection of formulation deviations, making it an efficient tool for incoming material inspection.

Dehui provides a full range of TA and Mettler Toledo TGA instruments as well as method development support.

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