I am preparing PVDF solution for electrospinning by mixing 20 wt% PVDF in 7:3 DMSO:Acetone and stirring it at 75°C and 1000 RPM. But every time almost after an hour of preparation it is turning yellowish and too much viscous such that in middle of experiment syringe and needle gets jammed. I am not able to perform electrospinning for more than 30 minutes due to this.
What could be the possible reasons for this (such as lower ambient temperature, inappropriate solvents, solvent ratios, or any other )?
How can I overcome this problem?
Dear Saket Phadkule, at such temperature and for one hour of mixing at high RPM, the amount of acetone (Bp 56°C) is almost lost. My Regards
These are interesting references.
https://doi.org/10.1002/pi.4314
https://iopscience.iop.org/article/10.1088/1742-6596/987/1/012011
https://doi.org/10.1016/j.memsci.2018.06.050
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7825031/
Acetone's boiling point is 56°C. As you are stirring it at 75°C, it would be completely lost. Resulting in your non-spinnability.
Thanks and regards
At 75°C, acetone would be boiled and highly escape, which results in an increase in viscosity. Also, after mixing, the ratio of DMSO:Acetone would be different than 7:3. My suggestion is to stir at less than 56°C for overnight (~10 hours) at a mixing speed lower than 1000 RPM.
- Badges
- Science topic
- Similar topics
- Biological Science
- Bioecology
- Systems Ecology
- Landscape Ecology
- Connectivity