Interfacial and mechanical properties of carbon fibers modified by electrochemical oxidation in (NH4HCO3)/(NH4)2C2O4·H2O aqueous compound solution

Liu, Jie; Tian, Yuli; Chen, Yu-Jia; Ji, Liang

doi:10.1016/j.apsusc.2010.03.141

Cited by 102 publications

(40 citation statements)

References 20 publications

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“…The calculated values of I D / I G and I A / I G are also tabulated in Table . In regard to the ordered degree, the smaller I D / I G value represents that the carbon fibers possess more ordered structure and vice versa . As shown in Table , the I D / I G and I A / I G values also gradually decreased with decreased FWHM values of disorder‐induced D‐line and A‐line.…”

Section: Resultsmentioning

confidence: 91%

“…It possibly results from amorphous carbonaceous structures, some hetero atoms on the fiber surfaces, or some original functional groups . The integral area ratio of the A‐line to the G‐line ( I A / I G ) could indicate the proportion of amorphous carbonaceous structures . An additional peak at 1,595 cm −1 (D′‐line) is sometimes observed in disordered graphite, which has been attributed to splitting of the degenerate E 2 2g peak and to breakdown of the Raman selection rules, allowing contribution from non‐zone‐center phonons…”

Section: Introductionmentioning

confidence: 99%

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Effect of fiber microstructure studied by Raman spectroscopy upon the mechanical properties of carbon fibers

Qian

Wang

Zhong

et al. 2019

J Raman Spectroscopy

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The microstructure of polyacrylonitrile (PAN)‐based high‐performance carbon fibers, including high‐strength carbon fibers (HSCFs), high‐modulus carbon fibers (HMCFs), and ultrahigh‐modulus carbon fibers (UHMCFs), was systematically characterized by the Raman spectroscopy. Two characteristic bands, D‐line and G‐line, showed up in the Raman spectra of HSCFs, HMCFs, and UHMCFs. However, the wavenumber of the G‐line peak of HSCFs shifted to higher wavenumber (about 1,595 cm−1) and that of the D‐line peak of HMCFs and UHMCFs shifted to lower wavenumber (about 1,350 cm−1). The relationship between the microstructure and mechanical properties of carbon fibers was also studied in detail. It was of significant relevance between surface disordered structure and the mechanical properties of HSCFs, and decreases in the full width at half maximum values of the disorder‐induced D‐line and A‐line could result in higher tensile strength and tensile modulus of HSCFs. As for HMCFs and UHMCFs, the disorder‐induced D′‐line more easily affected the tensile strength. A higher tensile modulus of HMCF and UHMCF was obtained as a result of decreases in the disordered structure and increases in the graphite structure. An increase of the intensity ratio ID/IG together with IA/IG (HSCFs) or ID′/IG (HMCFs and UHMCFs) could result in increases in the tensile strength and tensile modulus of carbon fibers.

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Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Effect of fiber microstructure studied by Raman spectroscopy upon the mechanical properties of carbon fibers

Qian

Wang

Zhong

et al. 2019

J Raman Spectroscopy

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“…Electrochemical oxidation method is quick, controllable, and more suitable for industrial online treatment method for carbon fiber . Many researches have been done on the electrochemical oxidation of carbon fiber.…”

Section: Introductionmentioning

confidence: 99%

“…Electrochemical oxidation method is quick, controllable, and more suitable for industrial online treatment method for carbon fiber. 9,10 Many researches have been done on the electrochemical oxidation of carbon fiber. Bismarck et al 11 reported the effect of various alkaline electrolyte systems on the surficial properties of HMCFs.…”

Section: Introductionmentioning

confidence: 99%

Study on multistage anodization for high‐modulus carbon fiber

You

et al. 2019

Surface & Interface Analysis

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Because of the strong chemical inertness of high‐modulus carbon fiber (HMCF), the surface treatment of HMCF becomes less effective. In this work, multistage anodization method was applied to modify HMCF. NH4HCO3 and (NH4)2SO4 were used as electrolytes to study the influence of electrolyte type on the oxidation effect in the multistage oxidation process. The HMCF was treated by multistage anodization in the following three ways: NH4HCO3 → NH4HCO3, (NH4)2SO4 → (NH4)2SO4, and NH4HCO3 → (NH4)2SO4. In order to compare with the multistage anodization methods, HMCF was also anodized by NH4HCO3 and (NH4)2SO4 using single anodization method, respectively. The treated HMCFs were characterized in detail using X‐ray photoelectron spectroscopy (XPS), Raman spectroscopy, Scanning Electron Microscope (SEM), Atomic Force Microscope (AFM), and dynamic contact angle analysis, respectively. The results of XPS exhibited that HMCF modified by multistage anodization showed more functional groups on its surface. More sp2 hybridized bonds were converted into sp3 hybridized bonds after modification by multistage anodization, especially when (NH4)2SO4 was used as electrolyte. The results of SEM/AFM indicated that HMCF modified by multistage showed a greater surface roughness. Interlaminar shear strength (ILSS) was used to observe the interfacial properties of HMCF between epoxy resin. The results showed that ILSS of untreated carbon fiber composite was only 27.3 MPa; it was increased to 71.8 and 78.6 MPa after treated with single anodization by NH4HCO3 and (NH4)2SO4, respectively. After modification by multistage anodization, the ILSS increased in different degrees compared with single anodization method. Especially, the ILSS reached 93.1 MPa when the method of using NH4HCO3 followed by (NH4)2SO4 was used to treat HMCF.

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“…Among them, electrochemical oxidation treatment is known to be very effective for enhancing interfacial adhesion and increasing oxygen founctional groups. It is generally preferred because the treatment process is comparatively mild, and it has been widely applied in industrial manufacturing [19,20]. In order to treat the CF surface, various electrolytes have been used such as acid solutions, basic solutions, and ammonium-salt solu-http://carbonlett.org mately 80-150 µm diameter were then placed on the fiber.…”

Section: Introductionmentioning

confidence: 99%

Effects of electrochemical oxidation of carbon fibers on interfacial shear strength using a micro-bond method

Kim¹,

An²,

Bang³

et al. 2016

Carbon letters

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In this work, we studied the effects of electrochemical oxidation treatments of carbon fibers (CFs) on interfacial adhesion between CF and epoxy resin with various current densities. The surface morphologies and properties of the CFs before and after electrochemical-oxidation-treatment were characterized using field emission scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and single-fiber contact angle. The mechanical interfacial shear strength of the CFs/ epoxy matrix composites was investigated by using a micro-bond method. From the results, electrochemical oxidation treatment introduced oxygen functional groups and increased roughness on the fiber surface. The mechanical interfacial adhesion strength also showed higher values than that of an untreated CF-reinforced composite.

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Interfacial and mechanical properties of carbon fibers modified by electrochemical oxidation in (NH4HCO3)/(NH4)2C2O4·H2O aqueous compound solution

Cited by 102 publications

References 20 publications

Effect of fiber microstructure studied by Raman spectroscopy upon the mechanical properties of carbon fibers

Effect of fiber microstructure studied by Raman spectroscopy upon the mechanical properties of carbon fibers

Study on multistage anodization for high‐modulus carbon fiber

Effects of electrochemical oxidation of carbon fibers on interfacial shear strength using a micro-bond method

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