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dc.contributor.authorWhitford, Jonathan
dc.contributor.authorShinde, Manish A.
dc.contributor.authorHunt, Brandon L.
dc.contributor.authorMiller, Sandy
dc.contributor.authorKostogorova-Beller, Yulia
dc.identifier.citationWhitford, 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: 1278–1285en_US
dc.descriptionClick on the DOI link to access the article (may not be free).en_US
dc.description.abstractThis 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.en_US
dc.description.sponsorshipKansas NASA EPSCoR Program Partnership Development Grant Number 700474.en_US
dc.relation.ispartofseriesJournal of Polymer Science. Part B: Polymer Physics;v.55:no.17
dc.subjectBeta-ketonitrile fluorescenceen_US
dc.subjectStokes shiftsen_US
dc.subjectUV-vis spectroscopyen_US
dc.titlePerceived color of undoped electrospun polyacrylonitrile nanofibersen_US
dc.rights.holder(c) 2017 Wiley Periodicals, Inc.en_US

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