I'm working on setting up (bespoke) Electrospinning machine (multi emitter syringe pump, high voltage power supply, rotating/flat collector, etc. I'm thinking to perfrom hot electrospinning of the polymer (polyvinyl alcohol PVA) at a higher temperature ~ 250 DegC.
The questions I have in mind are the following:
i. Has anybody done this or similar to this kind, before or even is it possible?
ii. The problem is that the PVA polymer is in powder form and I don't want to load the syringes with aqueous solution of PVA; as I'm after 100% electrospun PVA nanofiber membrane.
Is there any method or machine unit that is available to do the job; to melt the PVA powder (melting point of PVA is 210 DegC) and somehow simultaneously electrospin onto the collector?
Actually, the problem is melting of the PVA powder is a separate process, then manually infusing into syringes (pipettes) is another and then at last loading on to the syringe pump for electrospinng, therefore, all experimental steps are performed at different temperatures. I know if I left the molten PVA in the syringes it will solidify and block the syringe barrel and also emitter needle, and syringe pump will also not be operational...
Shall wait for any advice from you guys.Many thanks for your time and support.
Best regards,
Baber
Dear Baber Saleem, I think at such a temperarure or higher you are close to the thermal decomposition of PVAl. So worth to consider is the thermal stability at high temperature. My Regards
https://www.researchgate.net/publication/254346613_Thermal_Decomposition_Behavior_of_Poly_Vinyl_Alcohol_with_Different_Hydroxyl_Content
This is a too high temperature for PVA the polymer will degrade and also change color
Dear all, the following documents links cover most details about the question. My Regards
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566817/
https://www.researchgate.net/publication/266282246_Design_And_Evaluation_Of_Melt-Electrospinning_Electrodes
https://biomaterialsres.biomedcentral.com/articles/10.1186/s40824-019-0159-9
https://doi.org/10.1016/j.matdes.2019.108274
https://doi.org/10.1016/j.aiepr.2019.06.002
http://electrospintech.com/article_mdesp.html#.Xln5ZLfftkw
https://iopscience.iop.org/article/10.1088/1468-6996/12/1/013002
DOI:10.1039/C7RA04937D
https://doi.org/10.1002/adfm.201904664
https://link.springer.com/referenceworkentry/10.1007%2F978-3-319-42789-8_11-2
https://doi.org/10.1021/bm050777q
https://www.elsevier.com/books/melt-electrospinning/liu/978-0-12-816220-0
My question is why this such variations in fibre of same material PVA
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