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Study on Anodic Oxidation Surface Treatment of PAN-Based High-Modulus Carbon Fibers by Cyclic Voltammetry

Author: LiHaiTao
Tutor: TianYanHong
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Cyclic voltammetry High modulus PAN-based carbon fiber Anodic oxidation mechanism Chemical titration
CLC: TQ342.742
Type: Master's thesis
Year: 2010
Downloads: 146
Quote: 1
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Abstract


The anodic oxide having a controllable, uniform and stable treatment effect and other advantages, is the most commonly used method for the surface modification of the carbon fibers. Firstly, by cyclic voltammetry, multiple scanning experiments of the domestic high modulus PAN-based carbon fiber, and by analytical scanning curve differences in the nature of the electrolyte, the research of the electrolyte screening methods and anodic oxidation mechanism. Then using these electrolytes were constant current oxidation treatment of carbon fiber, the fiber surface functional groups before and after the joint base titration, SEM characterization, surface morphology changes; treated fiber and epoxy resin interface bonding properties change through the layer between shear strength (ILSS) characterization. Determination of the performance of the carbon fiber in the treatment of the different electrolyte, verify the cyclic voltammetry select electrolyte feasibility. Get the following conclusions: (1) using cyclic voltammetry, multiple scan results show different electrolyte solution cyclic voltammetry (CV) curves are very different in different electrolyte carbon fiber. H2SO4 as the electrolyte, the CV curve three oxidation reaction peak, surface functional groups in the fiber after the H2SO4 solution constant current oxidation treatment was measured and found that a carboxyl group, a hydroxyl group, and lactone group have significantly increased; NH4H2PO4 solution CV curve of an oxidation peak of the response appears to peak current is increasing, and the increase of the number of cycles, the KOH solution, NH4H2PO4 solution after treatment, the carbon fibers, the surface of the three functional groups has increased to some extent, to increase the processing result of the amplitude is less than H2SO4; CV curve of the background current is much larger than the other electrolyte solution, the fiber surface roughness after treatment, the surface of a large number of grooves and the granular projections. The above results show that the oxidation reaction on the nature of the peak in CV curves to show the course of the oxidation of the electrolyte on the fiber, and said background current degree of physical etching of the fiber surface is feasible. This conclusion laid the foundation to study the nature of the electrolyte and screening electrolyte for cyclic voltammetry. ② under the same scanning conditions, the scanning range is reduced to-0.3-0.6V, NH4HCO3 in NH4H2PO4 solution cyclic voltammetry experiment, so that the system does not occur in the water of the oxygen evolution reaction, and the multiple scan curve No oxidation reaction peaks, indicating that the surface of the fiber does not occur in the absence of the presence of a highly reactive oxygen oxidation reaction, this result with a recognized mechanism of anodic oxidation of the carbon fiber is completely consistent, i.e., the water in the electrochemical oxidation process precipitated highly active oxygen attached to the fiber surface, prompting the fiber surface chemical reaction to generate oxygen-containing functional groups. This also verified that the close relationship of the cyclic voltammetry curves with the anode oxidation process described using this method it is feasible to study the mechanism of anodic oxidation.

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CLC: > Industrial Technology > Chemical Industry > The chemical fiber industry > Synthetic fiber > Special fiber > Carbon fiber to maintain the fiber > Carbon fiber
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