My DSC curve (Figure1) do not show a horizontal shape. It may be related to the calibration, even though we recently calibrated the instrument.
In any case, the software offers an option in the settings tab: DSC/DTA Horizontal on/off (Figure 2). Using this mode, the curve changes to what I would expect and what is reported in the literature (Figure 3). Does this setting affect my analysis (glass transition, ...)? Can I rely on this setting to perform my analysis?
The glass transition isn't clearly visible in my curve (Figure 1), but when I apply DSC horizontal mode, I can clearly see it (Figure 3).
If I can use this setting, how/where should I set the segment (Figure 4)??
"... My DSC curve (Figure1) do not show a horizontal shape. It may be related to the calibration, even though we recently calibrated the instrument.
Is this (Fig. 1) the blank line???
You can take your measurements without using the settings tab: DSC/DTA Horizontal in off !! And then subtract the blank line from the curve.
Reza.... The baseline of your DSC plot is the main concern. It is highly related to the change in the heat capacity. IN your case you must deal with each peak as a single individual change. You do not need to relate all changes to the initial baseline.
Good day! As far as I can understand, after decomposition maximums (T = 480-550 deg.C) on Fig.2. your should have exothermic effects, but not endothermic. So probably this Horizontal may be something different. I think that a nice idea is to contact with certified dealers, and maybe you will clarify some SOPs on calibration. Or maybe your should try to compare metadata for several datafiles to track some changes in it.
And also an another question is about doubled exothermic maximums of material decomposition - are they repeatable? Because we also faced such a phenomenon for some polysaccharide-based materials, but seems to deal it https://www.researchgate.net/post/Differential_scanning_calorimetry_of_cellulose_and_other_polysaccharide-based_samples
And also I forgot to add, maybe if you have info on doubled decomposition maximums in DSC - please share in private messages or in our question: https://www.researchgate.net/post/Differential_scanning_calorimetry_of_cellulose_and_other_polysaccharide-based_samples
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