Enhancement in the thermomechanical properties of carbon fibre-carbon nanotubes-epoxy hybrid composites (original) (raw)
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Carbon fiber reinforced epoxy composite laminates, with strategically incorporated fluorine functionalized carbon nanotubes (f-CNTs) at 0.2, 0.3 and 0.5 weight percent (wt.%), are studied for improvements in tensile strength and stiffness and durability under both tension-tension (R = +0.1) and tension-compression (R = À0.1) cyclic loadings, and then compared to the neat (0.0 wt.% CNTs) composite laminate material. To develop the nanocomposite laminates, a spraying technology was used to deposit nanotubes on both sides of each four-harness satin weave carbon fiber fabric piece for the 12 ply laminate lay up. For these experimental studies the carbon fiber reinforced epoxy laminates were fabricated using a heated vacuum assisted resin transfer molding (H-VARTM Ò ) method followed by a 2 soak curing cycle. The f-CNTs toughened the epoxy resin-fiber interfaces to mitigate the evolution of fiber/fabric-matrix interfacial cracking and delamination under both static and cyclic loadings. As a consequence, significant improvements in the mechanical properties of tensile strength, stiffness and resistance to failure due to cyclic loadings resulted for this carbon fiber reinforced epoxy composite laminate.
Journal of Composite Materials, 2015
In this study, the mechanical, thermal and viscoelastic properties of multi-walled carbon nanotube/epoxy nanocomposite at low-weight percentages of nanotubes are evaluated and discussed. In order to provide better interfacial interactions of constituent materials, the multi-walled carbon nanotubes are functionalized with combination of H2SO4/HNO3. Dynamic-mechanical thermal analysis test and hot plate thermal conductivity are performed to characterize temperature-dependent mechanical and thermal properties. Our results indicate that applying low weight fractions of functionalized multi-walled carbon nanotubes can effectively improve the elastic storage modulus (∼47%) and thermal conductivity (∼36%) as a function of temperature. All steps and characterization are described in detail. For higher concentration of multi-walled carbon nanotubes, SEM characterization of the fracture surfaces of the samples reveals that agglomeration of the nanotubes is the main reason for degradation of t...
The hierarchical structure and properties of multifunctional carbon nanotube fibre composites
Carbon, 2012
The axial mechanical, electrical and thermal properties of carbon nanotubes (CNTs) can be exploited macroscopically by assembling them parallel to each other into a fibre during their synthesis by chemical vapour deposition. Multifunctional composites with high volume fraction of CNT fibres are then made by direct polymer infiltration of an array of aligned fibres. The fibres have a very high surface area, causing the polymer to infiltrate them and resulting in a hierarchical composite structure. The electrical and thermal conductivities of CNT/epoxy composites are shown to be superior to those of equivalent specimens with T300 carbon fibre (CF) which is widely used in industry. From measurements of longitudinal coefficient of thermal expansion (CTE) of the composites we show that the CTE of CNT fibres is approximately À1.6 • 10 À6 K À1 , similar to in-plane graphite. The combination of electrical, thermal and mechanical properties of CNT fibre composites demonstrates their potential for multifunctionality.
The matrix stiffness role on tensile and thermal properties of carbon nanotubes/epoxy composites
Journal of Materials Science, 2008
In this study, randomly oriented single-walled carbon nanotubes (SWCNTs)/epoxy nanocomposites were fabricated by tip sonication with the aid of a solvent and subsequent casting. Two different curing cycles were used to study the role of the stiffness of the epoxy matrix on the tensile and thermal behavior of the composites. The addition of a small amount of SWCNTs (0.25 wt.%) in rubbery, i.e., soft matrices, greatly increased Young’s modulus and tensile strength of the nanocomposites. The results showed that the tensile properties of soft epoxy matrices are much more influenced by the addition of carbon nanotubes than stiffer ones. The significant improvement in tensile properties was attributed to the excellent mechanical properties and structure of SWCNTs, an adequate dispersion of SWCNTs by tip sonication, and a stronger SWCNT/matrix interfacial adhesion in softer epoxy matrices. A slight improvement in the thermal stability of the nanocomposites was also observed.
In this present study surface modified Multi walled Carbon nanotube reinforced epoxy resin along with carbon fibre was fabricated and studied. The principal aim of this work is to reduce cluster formation by surface modification of carbon nano tubes. Surface modification was carried out by 3-aminopropyletrimethoxysilane with aqueous solution method. Surface modified carbon nano tubes were mixed into epoxy matrix by sonication process with 24KHz. Carbon fibre fabric was laid along with epoxy matrix in suitable wtume ratio 40% and composites were prepared by compression moulding technique. Different weight percentages of 0.3%, 0.6%, 0.9%, 1.2% and 1.5%of MWCNT were reinforced with epoxy matrix to evaluate the significant need of filler addition on matrix. Samples were cured by room temperature for 24 Hrs.The tensile, flexural, impact,hardness and inter laminar shear strength tests shows the surface modified MWCNT/Carbon fibre reinforced epoxy composites gives better results than unmodified MWCNT/carbon fibre reinforced epoxy resin composites. The TGA results shows modified MWCNT/carbon fibre epoxy resin composite gives maximum delay in degradation.Scanning electron microscope images revealed that the dispersion of surface modified MWCNT on epoxy matrix was better at high frequecny sonication than unmodified MWCNT/epoxy system.
Russian Journal of Applied Chemistry, 2016
Effect of the catalyst composition on the structure of nanotubes layers obtained on the surface of carbon nanofi bers was studied. We found the preliminary functionalization of the surface of carbon fi bers to affect the coating uniformity and the thickness of synthesized nanotube layer. We determined the optimal surface concentration of the catalyst (Fe-Co) which provides uniform layer of nanotubes on the surface of carbon fi bers. The effect of modifi cation of the surface of carbon fi bers with multi-walled carbon nanotubes on the mechanical properties of carbon fi ber-epoxy resin composites was examined. The modifi cation of the carbon fi bers with multi-walled carbon nanotubes were shown to increase the fl exural modulus and the fl exural strength.
Journal of Applied Physics, 2013
Multiwall carbon nanotubes (CNTs) were directly grown on woven carbon fibers using chemical vapor deposition technique and iron acetate as a catalyst. These CNTs grown woven carbon fibers were further infused with epoxy resin to fabricate fiber reinforced nanocomposites. Both electric and mechanical properties of these composites were studied and found that the electric resistivity of composite reduced significantly as the amount of CNTs on woven carbon fiber increased. For the neat composite without CNTs, the resistivity observed was 25 XÁm, while it was only 0.2 XÁm for the composite with 3.3 wt. % of CNTs grown on woven carbon fiber. The flexure test results showed a 34% increase in strength and 126% increase in stiffness for 1.65 wt. % CNTs grown on woven carbon fiber. V C 2013 AIP Publishing LLC. [http://dx.