Hello everyone.
I am the new one in the polymer field. Just now I have the DSC data. but I dont know how to calculate the ∆Hf and ∆Hm from this result. This is the first time I facing this analysis. I am already learn from journal and youtube but I still can not to catch up how to calculate this. Maybe some of you have experience on this. May do you help me to this?Thank you very much.
Sample Polyurethane: 1. Soft segment PLA+Butanediol , Hard segment IPDI diisocyanate
Weight of sample is 9.3900 mg,
Heat from -20 to 200 oC with nitrogen flow rate 60 mL/min
Dear Teuku,
I saw your question some time ago, maybe you have already solved this problem !
For me it is strange the big difference between the first and second DSC heating scan, therefore some new characterizations are welcome:
Looking at the first DSC heating scan, presence of endothermal and exothermal events, can be ascribed to the presence of some residual/unreacted products and additional reactions that are evidenced during the heating of your initial product.
These events are not evidenced in the second DSC heating. My suggestion is to repeat the analysis, or even to do a third DSC heating scan.
Because you know well your system, for the interpretation of results will be helpful to use some papers from literature linked to your system/PU product.
Good luck in your R&D project and best regards,
Marius
Marius Murariu Thank you very much for your good answer and suggestions. I will look further for this analysis🙏
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