The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Yudong Huang - One of the best experts on this subject based on the ideXlab platform.

  • electrophoretic deposition of graphene oxide on continuous Carbon Fibers for reinforcement of both tensile and interfacial strength
    Composites Science and Technology, 2016
    Co-Authors: Caifeng Wang, Jun Li, Xiaoyu Li, Feng Zhao, Bo Jiang, Yudong Huang
    Abstract:

    Abstract Carbon fiber reinforced composites have been attracting increasing attention due to their excellent mechanical properties. However, the interfacial properties of Carbon fiber composites tend to be weak because Carbon Fibers naturally show a weak wettability and adsorption with most polymers matrix. Here, we proposed a method to improve the interfacial properties of Carbon fiber composites together with the tensile strength of Carbon fiber. Briefly, a layer of graphene oxide (GO) was deposited on continuous Carbon Fibers by electrophoretic deposition in isopropyl alcohol under ultrasonic treatment. After treatment at 150 °C, the tensile strength of Carbon Fibers and the interfacial shear strength (IFSS) of Carbon fiber/epoxy composites were enhanced by 34.58% and 69.87%, respectively. This method is believed to have applications in continuous production of high-performance Carbon fiber composites.

  • the oxidation of Carbon Fibers through k2s2o8 agno3 system that preserves fiber tensile strength
    Composites Part B-engineering, 2014
    Co-Authors: Linghui Meng, Chunhua Zhang, Dapeng Fan, Yudong Huang
    Abstract:

    Abstract Carbon fiber reinforced composite materials can be enhanced by introducing oxygen-containing groups on the surface of the reinforcing Fibers to improve the interface bonding strength between Carbon Fibers and polymer matrix. While the addition of oxygen-containing groups has been shown to effectively increase the interfacial interaction between Fibers and matrix, the treatments tend to consume the Carbon fiber tensile strength. In this work, the surface of Carbon Fibers is oxidized by a chemical oxidation method which employs a strong oxidant of K 2 S 2 O 8 and a catalyst of AgNO 3 to effectively creating carboxyl and hydroxy functionalized surface and the reaction is shown that it can preserve the tensile strength and morphology of the Carbon Fibers. The surface oxidation is investigated by X-ray photoelectron spectroscopy, which shows that the relative surface coverage by oxygen atoms is increased from an initial 4.49% up to a maximum of 14.11% while the results of single fiber tensile strength tests demonstrate that the reaction did not lead to any obvious decrease in the fiber tensile strength. After oxidation, the interfacial shear strength (IFSS) improved from 59.52 to 96.73 MPa, with a increase of 62.5%.

  • surface amination and hydrolyzation of Carbon Fibers treated with triethylene tetramine in supercritical water ethanol system
    Composites Part B-engineering, 2014
    Co-Authors: Linghui Meng, Chunhua Zhang, Dapeng Fan, Zaixing Jiang, Yudong Huang
    Abstract:

    Abstract To improve the interfacial properties between Carbon Fibers and epoxy matrix, the Fibers were treated by an ammoniac medium, which consisted of supercritical water, ethanol and triethylene tetramine. The images of atomic force microscopy and scanning electron microscope indicate that coating layers are formed on the surfaces of treated Fibers. The results of X-ray photoelectron spectroscopy demonstrate that N content on the surfaces of Carbon Fibers increases and the main ammoniac groups of the coating layers are amino and imino groups. The mechanical measurements indicate that both interlaminar and interface shear strength of Carbon Fibers are significantly increased after amination.

  • effect of epoxy coatings on Carbon Fibers during manufacture of Carbon fiber reinforced resin matrix composites
    Materials & Design, 2010
    Co-Authors: Yudong Huang
    Abstract:

    Abstract The changes in oxygen and nitrogen during manufacture of the Carbon fiber reinforced resin matrix composites were measured using the X-ray photoelectron spectroscopy method. The effects of the change in oxygen and nitrogen on the strength of the Carbon Fibers were investigated and the results revealed that the change of the tensile strength with increasing heat curing temperature was attributed to the change in the surface flaws of the Carbon Fibers because the Carbon Fibers are sensitive to the surface flaws. The effect of the surface energy that was calculated using Kaelble’s method on the strength of the Carbon Fibers was investigated. Furthermore, the surface roughness of the Carbon Fibers was measured using atom force microscopy. The change trend of roughness was reverse to that of the strength, which was because of the brittle fracture of the Carbon Fibers.

  • interface property of Carbon Fibers epoxy resin composite improved by hydrogen peroxide in supercritical water
    Materials Letters, 2009
    Co-Authors: Yudong Huang, Linghui Meng
    Abstract:

    Carbon Fibers were treated by hydrogen peroxide in supercritical water and the surface morphologies of treated Carbon Fibers were observed by atomic force microscopy. It was found that surface roughness of the treated Carbon fiber was improved obviously. Furthermore, X-ray photoelectron spectroscopy (XPS) was used to analyze surface functional groups of Carbon Fibers. It was found that functional groups containing oxygen were significantly increased compared with untreated Carbon Fibers. The maximal interlaminar shear strength (ILSS) of treated Carbon Fibers/epoxy resin composite was 110.5 MPa, which was higher than 63.5 MPa for untreated Carbon Fibers/epoxy resin composite. It also indicated that interface property of Carbon Fibers/epoxy resin composite was improved by hydrogen peroxide in supercritical water.

Linghui Meng - One of the best experts on this subject based on the ideXlab platform.

  • the oxidation of Carbon Fibers through k2s2o8 agno3 system that preserves fiber tensile strength
    Composites Part B-engineering, 2014
    Co-Authors: Linghui Meng, Chunhua Zhang, Dapeng Fan, Yudong Huang
    Abstract:

    Abstract Carbon fiber reinforced composite materials can be enhanced by introducing oxygen-containing groups on the surface of the reinforcing Fibers to improve the interface bonding strength between Carbon Fibers and polymer matrix. While the addition of oxygen-containing groups has been shown to effectively increase the interfacial interaction between Fibers and matrix, the treatments tend to consume the Carbon fiber tensile strength. In this work, the surface of Carbon Fibers is oxidized by a chemical oxidation method which employs a strong oxidant of K 2 S 2 O 8 and a catalyst of AgNO 3 to effectively creating carboxyl and hydroxy functionalized surface and the reaction is shown that it can preserve the tensile strength and morphology of the Carbon Fibers. The surface oxidation is investigated by X-ray photoelectron spectroscopy, which shows that the relative surface coverage by oxygen atoms is increased from an initial 4.49% up to a maximum of 14.11% while the results of single fiber tensile strength tests demonstrate that the reaction did not lead to any obvious decrease in the fiber tensile strength. After oxidation, the interfacial shear strength (IFSS) improved from 59.52 to 96.73 MPa, with a increase of 62.5%.

  • surface amination and hydrolyzation of Carbon Fibers treated with triethylene tetramine in supercritical water ethanol system
    Composites Part B-engineering, 2014
    Co-Authors: Linghui Meng, Chunhua Zhang, Dapeng Fan, Zaixing Jiang, Yudong Huang
    Abstract:

    Abstract To improve the interfacial properties between Carbon Fibers and epoxy matrix, the Fibers were treated by an ammoniac medium, which consisted of supercritical water, ethanol and triethylene tetramine. The images of atomic force microscopy and scanning electron microscope indicate that coating layers are formed on the surfaces of treated Fibers. The results of X-ray photoelectron spectroscopy demonstrate that N content on the surfaces of Carbon Fibers increases and the main ammoniac groups of the coating layers are amino and imino groups. The mechanical measurements indicate that both interlaminar and interface shear strength of Carbon Fibers are significantly increased after amination.

  • interface property of Carbon Fibers epoxy resin composite improved by hydrogen peroxide in supercritical water
    Materials Letters, 2009
    Co-Authors: Yudong Huang, Linghui Meng
    Abstract:

    Carbon Fibers were treated by hydrogen peroxide in supercritical water and the surface morphologies of treated Carbon Fibers were observed by atomic force microscopy. It was found that surface roughness of the treated Carbon fiber was improved obviously. Furthermore, X-ray photoelectron spectroscopy (XPS) was used to analyze surface functional groups of Carbon Fibers. It was found that functional groups containing oxygen were significantly increased compared with untreated Carbon Fibers. The maximal interlaminar shear strength (ILSS) of treated Carbon Fibers/epoxy resin composite was 110.5 MPa, which was higher than 63.5 MPa for untreated Carbon Fibers/epoxy resin composite. It also indicated that interface property of Carbon Fibers/epoxy resin composite was improved by hydrogen peroxide in supercritical water.

Kimiyoshi Naito - One of the best experts on this subject based on the ideXlab platform.

  • The effect of surface modification with Carbon nanotubes upon the tensile strength and Weibull modulus of Carbon Fibers
    Journal of Materials Science, 2012
    Co-Authors: Kimiyoshi Naito, Jennming Yang, Yuta Inoue, Hiroshi Fukuda
    Abstract:

    Carbon Fibers are widely used as reinforcements in composite materials because of their high specific strength and modulus. Today, a number of ultrahigh strength polyacrylonitrile (PAN)-based (more than 6 GPa), and ultrahigh modulus pitch-based (more than 900 GPa) Carbon Fibers have been commercially available. In contrast, Carbon nanotube (CNT) with the extremely high tensile strength have attracted attention as reinforcements. An interesting technique to modify the Carbon fiber is CNT grafting on the Carbon fiber surface. CNT-grafted Carbon Fibers offer the opportunity to add the potential benefits of nanoscale reinforcement to well-established fibrous composites to create micro-nano multiscale hybrid composites. In the present study, the tensile properties of CNT grown on T1000GB PAN- and K13D pitch-based Carbon Fibers have been investigated. Single filament tensile test at gauge lengths of 1, 5, and 25 mm were conducted. The effect of gauge length on tensile strength and Weibull modulus of CNT-grafted PAN- and pitch-based Carbon Fibers were evaluated. It was found that grafting of CNT improves the tensile strength and Weibull modulus of PAN- and pitch-based Carbon Fibers with longer gauge length (≥5 mm). The results also clearly show that for CNT-grafted and as-received PAN- and pitch-based Carbon Fibers, there is a linear relation between the Weibull modulus and the average tensile strength on log–log scale.

  • The effect of gauge length on tensile strength and Weibull modulus of polyacrylonitrile (PAN)- and pitch-based Carbon Fibers
    Journal of Materials Science, 2012
    Co-Authors: Kimiyoshi Naito, Jennming Yang, Yoshihisa Tanaka, Yutaka Kagawa
    Abstract:

    Carbon Fibers are widely used as a reinforcement in composite materials because of their high specific strength and modulus. Current trends toward the development of Carbon Fibers have been driven in two directions; ultrahigh tensile strength fiber with a fairly high strain to failure (~2%), and ultrahigh modulus fiber with high thermal conductivity. Today, a number of ultrahigh strength polyacrylonitrile (PAN)-based (more than 6 GPa), and ultrahigh modulus pitch-based (more than 900 GPa) Carbon Fibers have been commercially available. In this study, the tensile strengths of PAN- and pitch-based Carbon Fibers have been investigated using a single filament tensile test at various gauge lengths ranging from 1 to 250 mm. Carbon Fibers used in this study were ultrahigh strength PAN-based (T1000GB, IM600), a high strength PAN-based (T300), a high modulus PAN-based (M60JB), an ultrahigh modulus pitch-based (K13D), and a high ductility pitch-based (XN-05) Carbon Fibers. The statistical distributions of the tensile strength were characterized. It was found that the Weibull modulus and the average tensile strength increased with decreasing gauge length, a linear relation between the Weibull modulus, the average tensile strength and the gauge length was established on log–log scale. The results also clearly show that for PAN- and pitch-based Carbon Fibers, there is a linear relation between the Weibull modulus and the average tensile strength on log–log scale.

Hiroshi Fukuda - One of the best experts on this subject based on the ideXlab platform.

  • The effect of surface modification with Carbon nanotubes upon the tensile strength and Weibull modulus of Carbon Fibers
    Journal of Materials Science, 2012
    Co-Authors: Kimiyoshi Naito, Jennming Yang, Yuta Inoue, Hiroshi Fukuda
    Abstract:

    Carbon Fibers are widely used as reinforcements in composite materials because of their high specific strength and modulus. Today, a number of ultrahigh strength polyacrylonitrile (PAN)-based (more than 6 GPa), and ultrahigh modulus pitch-based (more than 900 GPa) Carbon Fibers have been commercially available. In contrast, Carbon nanotube (CNT) with the extremely high tensile strength have attracted attention as reinforcements. An interesting technique to modify the Carbon fiber is CNT grafting on the Carbon fiber surface. CNT-grafted Carbon Fibers offer the opportunity to add the potential benefits of nanoscale reinforcement to well-established fibrous composites to create micro-nano multiscale hybrid composites. In the present study, the tensile properties of CNT grown on T1000GB PAN- and K13D pitch-based Carbon Fibers have been investigated. Single filament tensile test at gauge lengths of 1, 5, and 25 mm were conducted. The effect of gauge length on tensile strength and Weibull modulus of CNT-grafted PAN- and pitch-based Carbon Fibers were evaluated. It was found that grafting of CNT improves the tensile strength and Weibull modulus of PAN- and pitch-based Carbon Fibers with longer gauge length (≥5 mm). The results also clearly show that for CNT-grafted and as-received PAN- and pitch-based Carbon Fibers, there is a linear relation between the Weibull modulus and the average tensile strength on log–log scale.

Jinsoo Jeong - One of the best experts on this subject based on the ideXlab platform.

  • fast recovery process of Carbon Fibers from waste Carbon Fibers reinforced thermoset plastics
    Journal of Environmental Management, 2019
    Co-Authors: Jinsoo Jeong, Kayhyeok An
    Abstract:

    Abstract In this work, we report a fast recycling process for Carbon fiber-reinforced thermosetting resin matrix composites, to obtain recycled Carbon Fibers. Steam (H2O) was selected as an oxidant to decompose the resin of the composites. The recycling reaction temperature and time were set in the range of 600–800 °C and 60 min, respectively. The recovery yield, surface morphologies, and mechanical properties including tensile strength and modulus of the recovered Fibers were measured to evaluate the recycling efficiency. Microstructural properties of the recycled fiber were observed by X-ray studies, and the correlation of mechanical properties of the Fibers with crystallite size and distribution was also evaluated. In conclusion, the Carbon Fibers were successfully recycled, while retaining 65% and 100% of the Fibers’ original tensile strength and modulus, respectively. 100% recovery yield was achieved in 60 min of decomposition time and 140 min of total process time.