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Surface Treatment of Pitch-Based Discontinuous Carbon Fibers


Title: Surface Treatment of Pitch-Based Discontinuous Carbon Fibers

Authors: Ngon T. Tran, Brendan A. Patterson, Vincent M. Wu, and Daniel B. Knorr, Jr.

DOI: 10.33599/nasampe/s.19.1424

Abstract: Given the exponential growth in carbon fiber products, it is both environmentally and economically practical to recycle carbon fibers. Instead of being disposed in landfills, recycled carbon fibers can fill the anticipated gap between supply and demand, especially because the production costs of carbon fibers remain high. One of the barriers to reintroducing recovered and recycled carbon fibers is the lack of an efficient method for surface treating reclaimed chopped fibers that have undergone recycling processes (e.g. pyrolysis) that leave the fiber surface essentially without functional groups that are required to ensure good fiber-matrix adhesion. For example, discontinuous fibers cannot be surface treated using conventional roll-to-roll electrochemical surface treatments that are used for continuous pitch- and poly(acrylonitrile)-based fibers. In this presentation, we describe novel methods for applying surface treatments to these discontinuous fibers via both electrochemical and wet chemical means. Changes in surface chemistry, and surface topology were quantified/monitored using X-ray photoelectron spectroscopy, and scanning electron microscopy. Specifically, we demonstrate broad control over surface oxygen and nitrogen concentrations and demonstrate that these are similar to those achieved via conventional surface treatments of continuous fibers by varying processing conditions (e.g., temperature, electrolyte concentration, ionic conductivity, reagent composition). Overall, our new method provides a scalable, effective means of surface treatment for discontinuous carbon fibers.

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Conference: SAMPE 2019 - Charlotte, NC

Publication Date: 2019/05/20

SKU: TP19--1424

Pages: 5

Price: FREE

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