(a)

(b)

(c)

(d)

Figure 3: FESEM images of polystyrene fibers produced from polystyrene solutions of varying volatility: (a) 100% THF; (b) 75% THF/25% DMF; (c) 50% THF/50% DMF; (d) 100% DMF. Adapted from Megelski et al. [79].