Hi
We're just trying to fabricate PVA/Chitosan & PEO/Chitosan electrospun fibers. The used solutions were:
Chitosan Solution:1wt% chitosan in 5% v/v glacial acetic acid
PVA Solution:5wt% PVA in distilled water
PEO Solution: 1wt% PEO in 5% v/v glacial acetic
Subsequently, the solutions were blended in order to obtain different proportions of PVA/Chitosan & PEO/Chitosan solutions.
The problem is that we couldn't obtain any fibers and we have just observed some particles on the collector.
We think that the viscosity of our solutions are so low and this problem is because of low concentration of chitosan in the initial solution. But firstly, as a lot of references have reported, we made a 3wt% chitosan in 5% v/v glacial acetic acid. The prepared solution was so viscose that we couldn't even stir it and it was like a solid gel.
We are using medium molecular weight chitosan with the molecular weight of 190,000-310,000.
What is the solution?
Thank you very much in advance
As you said, because of the viscosity increased after increasing of chitosan concentration you may choose appropriate state of solution by varying its amount there. Just try to decrease it as 2% or even 1.5% in the mixture.
Dear Parham
We use 1.5 wt% moderate molecular weight chitosan solution in 1 % acetic acid, and it works well. When we tried the higher concentrations, the solutions were very viscous. However, this paper may help you regarding the conditions of chitosan and PEO:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5133791/
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