Perceived color of undoped electrospun polyacrylonitrile nanofibers

No Thumbnail Available
Issue Date
Embargo End Date
Whitford, Jonathan
Shinde, Manish A.
Hunt, Brandon L.
Miller, Sandy
Kostogorova-Beller, Yulia

Whitford, J., Shinde, M., Hunt, B., Miller, S. and Kostogorova-Beller, Y. (2017), Perceived color of undoped electrospun polyacrylonitrile nanofibers. J. Polym. Sci. Part B: Polym. Phys., 55: 1278–1285


This work reveals influence of electrospinning of polyacrylonitrile-N,N-dimethylformamide solution of different concentrations on nanofiber web color parameters, molecular structure, and heat stability. It is found that fiber diameters depend on concentration through the power law relationship; however, the medium concentration-based web is characterized by a green-yellow hue, representative of the chromophore color; while, the solvent-rich and solvent-poor solution-based webs give rise to Stokes shifts and ultraviolet-blue emission bands, attributed to fluorescence. The chromophore structure, present in the neat powder, undergoes changes as a result of electrospinning reflected by the enamine-to-ketonitrile conversion and the fraction of C=N conjugation. Blue-shifting of the C=N conjugation is indicative of a reduction of the pi-electron system, which is coincident with the decreased color saturation value but observed only in the nanofibers prepared from the medium concentration solution. A decrease in the glass transition and an increase in cyclization temperatures also support these findings.

Table of Content
Click on the DOI link to access the article (may not be free).