The oxidation of carbon fibers through K2S2O8/AgNO3 system that preserves fiber tensile strength

Yu, Jiali; Lian, Meng; Fan, Dapeng; Zhang, Chunhua; Yu, Fei; Huang, Yudong

doi:10.1016/j.compositesb.2013.12.037

Cited by 80 publications

(35 citation statements)

References 21 publications

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“…For untreated CF, the broad band in the range of 2,800–2,980 cm −1 is attributed to the stretching vibration of C–H of methyl and methylene groups, the bands centered at about 1,050–1,100 cm −1 and 1,580–1,699 cm −1 is assigned to the stretching vibration of C–C and C=C, respectively . For CF–COOH, the broad band at 3,433 cm −1 is related to the stretching vibration of hydroxyl groups, and the new characteristic bonds appear at 1,735 cm −1 , which are assigned to the C=O stretching vibration of carboxylic groups , confirming that the untreated CF surface has been oxidized and etched by the acid modification method.…”

Section: Resultssupporting

confidence: 92%

An effective non‐covalent grafting approach to functionalize carbon fiber with polyethyleneimine in supercritical fluid to enhance the interfacial strength of carbon fiber/epoxy composites

Zhu

et al. 2017

Polymer Composites

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A facile and effective approach to functionalize carbon fiber (CF) by non‐covalent grafting branched polyethyleneimine (PEI) in conventional and supercritical methods was proposed. Fourier transform infrared (FTIR) spectrometry, X‐ray photoelectron spectroscopy, Raman, scanning electron microscopy (SEM), atomic force microscopy (AFM), dynamic contact angle analysis (DCA), and single fiber tensile testing were carried out to characterize the CF reinforcements. Interfacial shear strength (IFSS) and transmission electron microscopy were performed to investigate the composites interfacial properties. Experimental results indicated that the non‐covalent grafting polyethyleneimine on CF–COOH increased the polarity, wettability, and roughness of carbon fiber surface. The interfacial shear strength improved significantly using the two methods, especially in supercritical methanol, which further confirmed the previous study. Single fiber tensile strength did not deteriorate owing to the green modification. Moreover, this convenient project was believed to have widely potential applications in high performance composites. POLYM. COMPOS., 39:E2381–E2389, 2018. © 2017 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 92%

An effective non‐covalent grafting approach to functionalize carbon fiber with polyethyleneimine in supercritical fluid to enhance the interfacial strength of carbon fiber/epoxy composites

Zhu

et al. 2017

Polymer Composites

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“…According to Wang and Zhang, the incorporation of CFs can significantly improve the friction‐reducing and anti‐wear abilities of polyimide (PI) under dry sliding conditions, while Li and Cheng found the incorporation of CFs into PI can generally reduce the wear rate of composites, but may either increase or reduce the friction coefficient with different CF contents. Aromatic PI fiber has been recognized as one of the most important high‐performance polymeric fibers with superior performances such as excellent thermal stability, good chemical resistance, radiation shielding capability, and so on . In order to expand the application of the PI fibers, mechanical properties and other performance need to be improved.…”

Section: Introductionmentioning

confidence: 99%

Improving the interfacial property of carbon fiber/PI resin composite by grafting modification of carbon fiber surface

Chunzheng

2018

Surface & Interface Analysis

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The poor interfacial adhesion between carbon fibers (CFs) and polyimide (PI) resin has seriously hampered the application of CF/PI composites. In this work, the interfacial adhesion was efficiently enhanced by grafting on the CF surface. Surface morphology and surface composition of modified carbon fibers were characterized, which indicated that acrylamide was grafted successfully on the CF surface and the surface roughness was increased slightly. After grafting, the interface shear strength of modified carbon fibers/PI composites was significantly improved by 86.96%, and the interlaminar shear strength was enhanced by 55.61% due to the covalent bonds in interphase and the toughening effect of sizing agent. Moreover, the mechanical properties of composites with different interfacial adhesion were measured, which further confirmed the effect of the grafting modification.

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“…The CFs were cleaned in supercritical acetone/water at 360°C for 20 min to remove polymer sizing and pollutants , and were denoted as untreated CF. Then the extracted CF was treated in 0.01 mol·L −1 AgNO 3 /0.1mol·L −1 K 2 S 2 O 8 solution at 60°C for 1 h to generate carboxylic groups (CF‐COOH) .…”

Section: Methodsmentioning

confidence: 99%

Modification of carbon fibers surfaces with polyetheramines: The role of interphase microstructure on adhesion properties of CF/epoxy composites

Zhao

et al. 2017

Polymer Composites

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Interface construct plays a vital role in developing superior mechanical performance of carbon fibers (CFs)/resin composites. Herein, a facile approach for incorporation of polyetheramine (PEA) onto CFs surface by covalent bond (CF‐g‐PEA) was proposed, and compared to the adsorption one via Van der Waals' force (CF‐c‐PEA). FTIR, X‐ray photoelectron spectroscopy, Raman spectra, scanning electron microscopy, atomic force microscopy, dynamic contact angle analysis, single fiber tensile testing, and interfacial shear strength were carried out to characterize the CF reinforcements and composites. Experimental results showed that both of coating and grafting PEA on CFs increased the polarity, wettability, roughness of CF surface, and interfacial shear strength, especially CF‐g‐PEA, which indicated covalent bond interaction can combine more PEA on CF surface than that of Van der Waals. While single fiber tensile strength of CF‐c‐PEA increased due to the structure of CF without destruction. Meanwhile, the reinforcing mechanisms and interfacial failure modes of composites were also explored. The results suggest that the interphases between the CFs and resin matrix can be adjusted by varying the bonding natures between CF and grafted modifiers, thereby offering a new route for appropriate designing and development of CF‐based composite materials. POLYM. COMPOS., 39:E2346–E2355, 2018. © 2017 Society of Plastics Engineers

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The oxidation of carbon fibers through K2S2O8/AgNO3 system that preserves fiber tensile strength

Cited by 80 publications

References 21 publications

An effective non‐covalent grafting approach to functionalize carbon fiber with polyethyleneimine in supercritical fluid to enhance the interfacial strength of carbon fiber/epoxy composites

An effective non‐covalent grafting approach to functionalize carbon fiber with polyethyleneimine in supercritical fluid to enhance the interfacial strength of carbon fiber/epoxy composites

Improving the interfacial property of carbon fiber/PI resin composite by grafting modification of carbon fiber surface

Modification of carbon fibers surfaces with polyetheramines: The role of interphase microstructure on adhesion properties of CF/epoxy composites

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