I tried DMF( 100%), and DCM:DMF, in different rations, for DCM:DMF(4:1) I found elastin fiber mate with so many beads.
PCL you can spin in various solvents. The most straightforward way to get bead free fibers is to increase the PCL concentration to have more chain entanglements.
HFIP is best
If you are using a PCL with MW 80000 you can get bead free fibers using CLF:DMF 80:20 an a concentration about 12%wt.
Also around 18%wt. In DMF will led you to bead free fibers.
I hope this can help you
Best regards
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