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Fibers 2015, 3(4), 560-574; doi:10.3390/fib3040560

Properties of PAN Fibers Solution Spun into a Chilled Coagulation Bath at High Solvent Compositions

University of Kentucky Center for Applied Energy Research, 2540 Research Park Drive, Lexington, KY 40511, USA
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Academic Editor: Jonathan Phillips
Received: 3 November 2015 / Accepted: 10 December 2015 / Published: 15 December 2015
(This article belongs to the Special Issue Carbon Fibers)
View Full-Text   |   Download PDF [1062 KB, uploaded 15 December 2015]   |  

Abstract

In this work, multifilament, continuous polyacrylonitrile (PAN) fiber tow was solution spun mimicking industrial processing at the small pilot scale (0.5 k tow), while carefully altering the composition of the coagulation bath, in order to determine the effect on the resulting fiber shape, density, orientation, and tensile properties at varying points in the spinning process. Novel here are the abnormally high coagulation bath solvent compositions investigated, which surpass those often reported in the literature. In addition, the coagulation bath was maintained at a slightly chilled temperature, contrary to reported methods to produce round fibers. Further, by altering the composition of the bath in a step-wise fashion during a single spinning run, variations in all other process parameters were minimized. We found that with increasing solvent composition in the coagulation bath, the fibers not only became round in cross section, but also became smaller in diameter, which persisted down the spin line. With this decrease in diameter, all else equal, came an accompanying increase in apparent fiber density via a reduction in microvoid content. In addition, molecular orientation and tensile properties also increased. Therefore, it was found that inadequate understanding of the coagulation bath effects, and spinning at low coagulation bath solvent compositions, can hinder the ability of the fiber to reach optimum properties. View Full-Text
Keywords: polyacrylonitrile; solution spinning; coagulation polyacrylonitrile; solution spinning; coagulation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Morris, E.A.; Weisenberger, M.C.; Rice, G.W. Properties of PAN Fibers Solution Spun into a Chilled Coagulation Bath at High Solvent Compositions. Fibers 2015, 3, 560-574.

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