You can test various parameters to see if they solve your problems.  But I would recommend to start with increase the concentration -up to the max possible-  and/or reduce the surface tension by adding EtOH or a surfactant .

You can test various parameters to see if they solve your problems.  But I would recommend to start with increase the concentration -up to the max possible-  and/or reduce the surface tension by adding EtOH or a surfactant .

In this case, I think you can also consider the DH (degree of hydrolysis) of you purchased PVA. If the DH  is high (e.g: 98-99%) then it will take a higher temperature to dissolved the polymer (80 or 85-degree celsius for 4 hours) and it can work on low concentration also to remove the beads.

Try to increase the PVA concentration or use a solvent with lower surface tensio

n

Dear Dr. Ashraful,

Thank you, DH (87-90%), and I already used 85% for 4hrs But it didn't work, the end result was beaded nanofiber!

 Marc Simonet,

Just a little correction for your process. You can not use EtOH for any PVA solution. Even a 1wt% EtOH in PVA solution can form hydrogel instantly. I am using other surfactant for PVA solution to reduce its surface tension.

Thanks

Somaya A.Amer ·,

Try to prepare 12wt% PVA solution and heat it at 180 degree for 4 hours with constant staring. Do  not add all of your PVA  in water, initially add small amount of your polymer, and add gradually as they dissolve properly.  One important note, if you increase your Mw of PVA, you should reduce you wt%. Like 100K-150K Mw PVA can prepare max 8wt% solution and later you can use rotavapor to increase your concentration. This process help me for my PVA solution preparation.

Thanks

Hi, the best solvent could be acid acetic 1%. Electrospinning condition: distance 10, voltage 20kv, flow rate 0.5 ml per hour.

Prepare 15 % solution and then stirered for 12 hours at 60 c. I successfully electrospun pva with 60_80 kda mw.

Good luck in your research 

Dear Iman,

Thank you, But actually using aqueous solution (DW) as solvent one of my research hypothesis.

Do you mean adding acetic acid with water?..Or using it alone!