Have you tried to transform your TG curve into the 1st derivative curve? The steps of degradation are more easily identified.
I would fit the polymer degradation in a three steps process.
I also draw DTG curve which has 2 peaks.and you can see the figure below.I t has 2 peaks but in the TGA curve we can see 3 degradation steps.
Does the DTG curve could exactly determine the numbers of degradation steps?
Dear Xin Li
In most of the articles has been wrote that this kind of polymer (PVDF) degrates in 2 steps so why my sample curve has 3 steps and degrate in 3 steps? Is it possible?
As Xin Li said, the third degradation stage will appear like a broad peak in DTG. I'm not familiar with this class of polymer, but you also can try another heat rates to produce better visualization of the degradation steps.
Also I calculated the activation energies for these degradation steps by using Broido method.you know that in this method we sould draw Tangential lines and the slope of these lines gives the activation energy for all degradation steps. But unfortunately I can draw more than 3 Tangential lines while I have 3 degradation steps.So what is the reason?
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