Table 1: Experimental conditions: combinations of solvent systems, polymer concentration, and spinning solution flow rate and voltage.

SolventRatio
(v/v)
Polymer
concentration % (w/v)
Flow rate
(mL min−1)
Voltage
(kV)
As-spun fibres

Acetone150.0220–25Few ribbon-like fibres
DMAc150.0220–25Only beads
Acetic acid150.0220–25No production
Chloroform 150.0220–25Only beads
Methanol150.0220–25Only beads
Acetone : water17 : 3 150.0220–25No production
Acetone : water4 : 1 10Precipitation
Acetic acid : water3 : 1150.00420–25Large beads
Acetic acid : acetone3 : 1150.00420–25Few fibres and large beads
Acetic acid : DMAc3 : 1150.00420–25Large beads
DMAc : acetone2 : 1150. 00420–25Large beads
Methanol : water 4 : 110Precipitation
Methanol : acetone3 : 2 and 4 : 110Precipitation
Acetone : methanol3 : 2 and 4 : 1150.00420–25Fibres and small beads
Chloroform : methanol4 : 1150.00420–25Some ribbon-like fibres
Acetone : DMAc2 : 1150.00420–25Fibres and small beads
200.00420–25Fibres and small beads
250.00220–25Fibres free of beads