2000 g/mol very low molecular weight for the electrospining study. According to my experience, 80000 g/mol very suitable for electrospining and you can get smooth fibers or you can create a blend system with a higher molecular weight polymer and 2000 g/mol polycaprolactone.

Dear Saeed Ghadiri

Increasing the viscosity with low MW PCL will doesn't help in stretching of fibers during spinning process. Use PCL with MW b/w 70000-90000 g/mol.

All the best.

This molecular weight is very low for Electrospining due to low viscosity so you can mixed with high molecular weight of commercial PCL higher as blend or core shell.

But I can not import high-molecular weight polymers because I require PCL 2000 pure electrospun for a specific application in tissue engineering.

thank you for your answered.

you can try increase the polymer concentration and check the mechanical properties of your membrane. Good luck!