Dear Fatima,
I was not able to open your plot, but drom the description I can provide th following insights
In my understanding, the residue after burn-off may be due to the mineral additives in the polymer blend. Do you think this could be the case for your polymer blend composition? If so I would recommend using XRD to identify the mineral phase (crystalline) and possibly IR spectroscopy may be helpful too.
Sometimes mineral phase is added to the polymer to improve its mechanical properties or reduce warping i.e. in 3D printing applications. So, if there was a mineral phase in the blend originally, then it is the residue, while the polymer itself is burnt off. The sample with higher residue would mean a blend with higher mineral content. Hope this helps
Best Regards,
Andrey
You have not been attached any plot or graph, Therefore, we can not do the interpretation of results.
Apologies, the graph is now available.
Andrey, thanks for your insight on both my questions. When u say mineral content, do u mean perhaps the polymer is modified with metallic fillers?
@ Fatima Ahmad You are welcome! I hope these insights might be helpful. The filler may be metallic, but I would rather expect it to be mineral such as CaCO3 or possibly even carbonacious/CNT etc. In case of composite, it could be the reinforcement material that hasn't been burnt off.
On a first look at the plot, it seems that both polymer blends may have fillers. The top curve seems to have a high content of fillers (about 70 weight %) compared to the bottom one (about 10 % fillers by weight).
Another observation from these plots may suggest that higher filler content gives more thermal stability to the polymer, meaning it starts to degrade at higher temperatures.
Hope this info/interpretation may be useful to you.
Best Regards,
Andrey
Andrejs Krauklis Thanks again. I know that both of the plots r for thermosetting polymer, they do usally have better thermal stability than thermoplastics. It seems to me that the more thermally resistant one is polyimide.
Could you give me some info on What sort of chemical changes in a polymer/resin can result in such high thermal resistance? Are there any particular functional groups that increase a polymers thermal resistance?
@Fatima Ahmad To the best of my knowledge, aromatic polyimides have the highest thermal stability. So I would suggest to check whether you have an aromatic polyimide thermoset.
What I hypothetize is that aromatic groups in polyimides cause the thermal stability due to some effects affecting the electron density in the polymer chain. This I recommend to check in literature. Hope this helps!
Best Regards,
Andrey
Fatima.. Salam alaikum... The LT resin is surely a pure polymer with minimum or no filler. The HT resin is clearly has at least more than 70% of a filler. The residue of the LT is CHAR. For the HT resine you end up with char of the polymer and the residual product of the filler. If the filler was calcium carbonate the slow weight loss beyond the 500 C refers to the decomposition of the calcium carbonate into calcium oxide. ... Good luck
Wassalam Mahmood M. Barbooti Thank you for your response. You mentioned "The residue of the LT is CHAR. For the HT resin you end up with char of the polymer and the residual product of the filler."
Do you mean the filler has a much higher thermal degradation temperature and remains as it is while the polymer is burnt off until atleast 800C?
Also can you suggest potential differences in the chemical compositions of these resins which results in the improved temperature performance? (I dunno any details about the composition of either of the resins)
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