Hi there!
It's my first time doing dynamic mechanical analysis, and I have some questions that you could hopefully help me.
The analysis I have made consisted in applying a fixed deflection on the samples (I have used two different polymers) with a fixed frequency (1Hz) and isothermal (30ºC) condition. I have also analyzed the behavior of the stress over time.
When analyzing the storage and loss modulus values I have observed that: in one of the materials the loss modulus shows a sharp peak early in the test, whereas in the other polymer this occurred only at the end of the test. What does that mean? Does it make sense to analyze the loss module over time?
if you share your test results and specify the polymers you tested, we can comment. I could not figure out how you perfomed isothermal test with a constant frequency. In DMA, an isothermal run generally refers to creep or stress relaxation test. what do you mean with "fixed deflection" (a constant strain)?
Based on what you said, I guess you ran a time sweep at 30°C and 1 Hz to show some change to your sample. That makes sense if you suspect that your sample is somehow changing its properties, e.g. through crosslinking, but as Ali said, we cannot say more if we don't see your data
I would like to know what you are trying to achieve. Also, is it possible that your sample is changing? Reaction or crystallization for instance? As others have pointed out you are doing an unusual test. Temperature or frequency sweeps are most common in DMA.
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