Polyamic Acid Nanofibers Produced by Needleless Electrospinning

Figure 4

IR spectra of PAA(ODPA-ODA) in the form (a) nanofibre nonwoven layer, (b) solution in NMP and corresponding PI in the form (c) nanofiber nonwoven layer, and (d) film.

(a)

(b)

(c)

(d)