Effect of Changing Solvents on Poly(𝜺-Caprolactone) Nanofibrous Webs Morphology

Table 1

Effect of different solvents on nanofibrous web morphology (10% PCL, V = 15 KV, D = 20 cm, and R = 0.5 mL/hr).

Solvent type	Nanofibers morphology	Beads type	Viscosity (cPs)	Nanofibers average diameter	Solution conductivity (mS/m)	Beads size (μm)
						(a)**	(b)**
GAA	Good	Spindle-like	25	112 ± 32 nm	0.025	1.9 ± 0.4	3.8 ± 0.9
90AA	Good	Spindle-like	28.5	147 ± 48 nm	0.04	0.22 ± 0.14	0.6 ± 0.1
MC/DMF (4/1)	Good: bimodal* morphology	No beads	31.5	603 ± 308 nm	0.06	—	—
GFA	Bad: very brittle fibers with some branches	No beads	10	146 ± 24 nm	0.037	—	—
FA/acetone (4/1)	Bad: branchy fibers with a lot of beads	Sphere-shape beads	9.5	100 ± 23 nm	0.036	—	—

*:Blend of two different type of sizes (microfibers and nanofibers).
**:(a) Beads average height, (b) beads average length.