I am currently researching electrospun Thermal Polyurethane, do you know any good solvent for this chemical, I tried Methyl Ethyl Ketone but after that, it gelled up in the needle, a very big drop. Could anyone show me some methods to improve this?
Dear Tran Khanh, please check the following sample documents. My Regards
https://doi.org/10.1016/S0032-3861(02)00136-2
DOI: 10.5772/intechopen.69937
Dear Mr. Abdelkader BOUAZIZ
I tried to make the solution with PU is 10 wt% of the total solution, but when I dissolved PU, it did not go well. The mixture was not homogeneous, even after 12 hours. I think maybe there was some difference in the solution. Do you know any formulas to calculate the correct concentration based on the molecular weight of the polymer?
Thank you, Mr. Abdelkader BOUAZIZ
The most important point to consider is the MW threshold for entanglements, which generally induces the gelation (uncomplete solvation). So the concentration should be as low as possible to allow disentanglements (time). Please have a look at the following free RG document. My Regards
https://www.researchgate.net/publication/257922074_Effect_of_Polymer_Concentration_on_Electrospinning_System
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