In TGA analysis, is the weight loss increase with the increase of temperature,larger from 100, at first stage of decomposition process as from 30 to 150 C?
It depends on your sample stability. In your case most probably adhered/adsorbed solvent and moisture or unstable byproduct/component might be responsible for weight loss at such low temperature. Purify and dry the sample first before carrying out TGA analysis.
i agree with the answer of Asit Baran that it depends on the sample stability
I believe what you mean here is that you weight loss percentage increased above 100% between 30 to 150 degree C... If this is what you meant? If yes, it could be due to some reactions taking place within the sample. What environment did you use? Is it oxygen environment? If yes, your material could be oxidized, hence an increase could be observed on the percentage weight loss. However, if it was conducted in Nitrogen environment (inert environment), pure thermal degradation of material process should be noted.
In case you intend to refer to the problem of a negative percentage value found at a TGA plot, you may possibly find helpful to check my answer given to another question: https://www.researchgate.net/post/Can_TGA_show_negative_percentage_value
This is a pure physical disturbance, related to heating power, causing the gases to circulate convectionally (much less to temperature). Article "Precision Thermogravimetry" , J Therm Anal Calorim (2015) 120:139-147 DOI 10.1007/s10973-014-4384-0 proves that, and explains in detail.
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