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Let’s interpret the TGA curve step-by-step. --- ## Step 1 – Understand the Data Given From the graph and labels: - Material: Aramid fiber composite - Initial mass of composite: 54.2 µg (ng likely means µg here, common in TGA microbalance) - Mass of aramid fibers reference test: 9.57 µg (this is given separately but actually from a different run shown — might be here to compare degradation patterns, but initial composite contains both resin and fibers). - Steps in mass loss: each step corresponds to degradation of a certain component. The composite TGA curve shows multiple mass drops, labeled: 1. Step –3.120 % (occurs first, ~100 °C or less — moisture or low-T volatiles) 2. Step –2.067 % 3. Step –1.31 % 4. Step –48.91 % (main resin decomposition) 5. Step –0.541 % (high-T fiber degradation or further pyrolysis) The percentages are relative to the mass at __________ _________ _________ ________ _________ _____.
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