IMPROVING MECHANICAL PROPERTIES OF EPOXY BY ADDING MULTI-WALL CARBON NANOTUBE (original) (raw)
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Journal of Polymer Research, 2000
A suitable dispersion technique and quantitative evaluation of degree of dispersion of carbon nanotubes (CNT) in any solvent and matrix system has been one of the key issues for achieving enhanced performance of CNT reinforced composites. We report the use of UV–vis spectroscopy as a useful technique to ascertain the degree of dispersion of multiwalled carbon nanotubes (MWCNT) in the epoxy resin. The study has enabled to maximize dispersion of MWCNT in the epoxy resin using two different routes. As a result the composite samples prepared with only 0.3 wt.% amine functionalized MWCNT showed flexural strength of 140 MPa over the neat resin value of 55 MPa, an improvement of ~155% which is maximum reported so far for CNT-epoxy isotropic composites.
Mechanical Properties of Epoxy/Multi-Walled Carbon Nanotubes Composites
DAAAM International Scientific Book, 2016
In this paper, two types of multi-wall carbon nanotubes (MWCNTs) were dispersed into two different epoxy resins by highshear mixing. Dispersion and homogenisation of nanofillers was analysed by Field Emission Scanning Electrone Microscopy (FESEM). Microhardness of epoxy/MWCNTs nanocomposites, as well as of neat epoxy resins, is measured by Vickers method. The evolution of nanocomposites microhardness values were studied in function of curing time taking in account the influence of two different epoxy matrix and MWCNTs. Asymptotic values were analysed and compared with those of pure epoxy resin.
Fabrication and characterization of carbon/epoxy composites mixed with multi-walled carbon nanotubes
Materials Science and Engineering: A, 2008
In this study, a high-intensity ultrasonic liquid processor was used to obtain a homogeneous mixture of epoxy resin and multi-walled carbon nanotubes (CNTs). The CNTs were infused into epon 862 epoxy resin through sonic cavitation and then mixed with W curing agent using a high-speed mechanical agitator. The trapped air and reaction volatiles were removed from the mixture using a high vacuum. Flexural tests and fracture toughness tests were performed on unfilled and CNT-filled epoxy to identify the effect of adding CNTs on the mechanical properties of epoxy. The highest improvement in strength and fracture toughness was obtained with 0.3 wt% CNT loading. The nanophased matrix filled with 0.3 wt% CNT was then used with weave carbon fabric in a vacuum-assisted resin transfer molding (VARTM) set up to fabricate composite panels. Flexural tests, thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) were performed to evaluate the effectiveness of adding CNTs on the mechanical and thermal properties of the composite. The glass transition temperature, decomposition temperature, and flexural strengths were improved by infusing CNTs. Based on the experimental result, a linear damage model has been combined with the Weibull distribution function to establish a constitutive equation for neat and nanophased carbon/epoxy. Simulated result show that that infusing CNTs increases Weiubll scale parameter, but decrease Weibull shape parameter.
Properties of Epoxy Composites Reinforced with Multi-walled Carbon Nanotubes
2016
Plastic composite material has been in to frontier of research as one of the new competitive materials in engineering. Especially, Particle reinforced plastic is a relatively new class of composite material manufactured from particles, nanoparticles and resins, and has proven efficient and economical for the development and repair of new and deteriorating structures. In this project, we report the mechanical properties of epoxy composites strengthened with Multi walled carbon nanotubes. Different composition (0.1%, 0.5%, 1%, 1.5%) of Multi Walled Carbon Nanotubes (MWCNT) are mixed with epoxy resin and castings are prepared by moulding technique. The different mechanical properties such as Tensile strength, Flexural strength and Hardness are evaluated at room temperature. One set of samples are immersed in salt water for moisture absorption and strength degradation studies. The mechanical properties are determined and are compared with that of dry specimens. The Results show that the Mechanical Properties increases with the increase in Percentage of MWCNT for the prepared Composites.
Polymers for Advanced Technologies, 2011
Functionalization of multi-walled carbon nanotubes (MWCNTs) influences physico-mechanical properties of MWCNT/epoxy composites. Samples based on epoxy resin (EP) and different weight percentage of MWCNTs (functionalized and non-functionalized) were prepared. Epoxy/carbon nanotubes were prepared by different mixing methods (ultrasounds and a combination of ultrasounds and mechanical mixing) and better dispersion of carbon nanotubes (CNTs) was observed in the case of combination of these processes. CNTs modified with different functional groups were investigated. It was found that modified nanotubes form bigger agglomerates than unmodified ones. Surfactants were used to lower the surface tension of the liquid, which enabled easier spreading and reducing the interfacial tension. Some surfactants facilitate homogeneous dispersion of nanotubes in the resin through the reduction of resin viscosity.
Mechanical properties of multi-walled carbon nanotube/epoxy composites
Materials & Design, 2010
Untreated and acid-treated multi-walled carbon nanotubes (MWNT) were used to fabricate MWNT/epoxy composite samples by sonication technique. The effect of MWNT addition and their surface modification on the mechanical properties were investigated. Modified Halpin–Tasi equation was used to evaluate the Young’s modulus and tensile strength of the MWNT/epoxy composite samples by the incorporation of an orientation as well as an
Studies Of Influence on Multiwalled Carbon Nanotubes (MWCNT’s) Reinforced Epoxy Based Composites
International Journal of Modern Engineering Research (IJMER), 2014
In the present work, the Multiwalled Carbon Nanotube reinforced epoxy composites are fabricated with different weight fraction of the reinforcement and are subjected to hardness test as well as compression test. The mechanical properties of these composites are investigated and found posses increase in hardness test and young’s modulus with increased weight fraction of the reinforcement compared to the based matrix fabricated using the same process.
Multiwalled carbon nanotubes (MWCNTs)/epoxy nanocomposites were fabricated by using ultrasonication and the cast molding method. In this process, MWCNTs modified by mixed acids were well dispersed and highly loaded in an epoxy matrix. The effects of MWCNTs addition and surface modification on the mechanical performances and fracture morphologies of composites were investigated. It was found that the tensile strength improved with the increase of MWCNTs addition, and when the content of MWCNTs loading reached 8 wt.%, the tensile strength reached the highest value of 69.7 MPa. In addition, the fracture strain also enhanced distinctly, implying that MWCNTs loading not only elevated the tensile strength of the epoxy matrix, but also increased the fracture toughness. Nevertheless, the elastic modulus reduced with the increase of MWCNTs loading. The reasons for the mechanical property changes are discussed.
Composites Part B: Engineering, 2012
In this work, multi wall carbon nanotubes (MWCNTs) dispersed in a polymer matrix have been used to enhance the thermo-mechanical and toughness properties of the resulting nanocomposites. Dynamic mechanical analysis (DMA), tensile tests and single edge notch 3-point bending tests were performed on unfilled, 0.5 and 1 wt.% carbon nanotube (CNT)-filled epoxy to identify the effect of loading on the aforementioned properties. The effect of the dispersion conditions has been thoroughly investigated with regard to the CNT content, the sonication time and the total sonication energy input. The CNT dispersion conditions were of key importance for both the thermo-mechanical and toughness properties of the modified systems. Sonication duration of 1 h was the most effective for the storage modulus and glass transition temperature (T g ) enhancement for both 0.5 and 1 wt.% CNT loadings. The significant increase of the storage modulus and T g under specific sonication conditions was associated with the improved dispersion and interfacial bonding between the CNTs and the epoxy matrix. Sonication energy was the influencing parameter for the toughness properties. Best results were obtained for 2 h of sonication and 50% sonication amplitude. It was suggested that this level of sonication allowed appropriate dispersion of the CNTs to the epoxy matrices without destroying the CNT's structure.
Multi-Walled Carbon Nanotubes for Improved Performance Epoxy Nanocomposites
2017
BACKGROUND: Carbon nanotubes (CNT) are fast becoming key components in the production of high-strength composite materials. Two methods to prepare nanocomposites by covalent bonding between an epoxy matrix and functionalised CNT which acted as cross-linkers during polymerisation were investigated. RESULTS: In the standard method, 1 wt% functionalised CNT was dispersed in epoxy, hardener added and the composite was cured. In the masterbatch approach, 1 wt% functionalised CNT were mixed with epoxy in the presence of triethylamine accelerator, then cured. This yielded partially-cured epoxy; additional hardener was required to Page 2 of 27 achieve complete curing. Improvements were observed in storage modulus (E′) flexural modulus (EB), wear resistance and hardness were also improved. Thermal stability did not change appreciably for samples prepared by either the standard or masterbatch methods. Variations in the results obtained as a function of preparation method, functionalised CNT a...