Mesoscopic simulation of thermal conductivities of 3D carbon nanotubes, graphene and their epoxy resin based composites

The effect of the surface modification of carbon nanotubes on their dispersion in the epoxy matrix Functionalization of multi-walled carbon nanotubes (MWCNTs) has an effect on the dispersion of MWCNT in the epoxy matrix. Samples based on two kinds of epoxy resin and different weight percentage of MWCNTs (functionalized and non-functionalized) were prepared. Epoxy/carbon nanotubes composites were prepared by different mixing methods (ultrasounds and a combination of ultrasounds and mechanical mixing). CNTs modified with different functional groups were investigated. Surfactants were used to lower the surface tension of the liquid, which enabled easier spreading and reducing the interfacial tension. Solvents were also used to reduce the liquid viscosity. Some of them facilitate homogeneous dispersion of nanotubes in the resin. The properties of epoxy/nanotubes composites strongly depend on a uniform distribution of carbon nanotubes in the epoxy matrix. The type of epoxy resin, solvent, surfactant and mixing method for homogeneous dispersion of CNTs in the epoxy matrix was evaluated. The effect of CNTs functionalization type on their dispersion in the epoxy resins was evaluated on the basis of viscosity and microstructure studies.

Download Full-text

Enhancement of out-of-plane mechanical properties of carbon fiber reinforced epoxy resin composite by incorporating the multi-walled carbon nanotubes

SN Applied Sciences ◽

10.1007/s42452-021-04624-2 ◽

2021 ◽

Vol 3 (6) ◽

Author(s):

Seyed Ali Mirsalehi ◽

Amir Ali Youzbashi ◽

Amjad Sazgar

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Tensile Test ◽

Epoxy Resin ◽

Laminate Composite ◽

Filament Winding ◽

Hybrid Nanocomposites ◽

Out Of Plane ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

AbstractIn this study, epoxy hybrid nanocomposites reinforced by carbon fibers (CFs) were fabricated by a filament winding. To improve out-of-plane (transverse) mechanical properties, 0.5 and 1.0 Wt.% multi-walled carbon nanotubes (MWCNTs) were embedded into epoxy/CF composites. The MWCNTs were well dispersed into the epoxy resin without using any additives. The transverse mechanical properties of epoxy/MWCNT/CF hybrid nanocomposites were evaluated by the tensile test in the vertical direction to the CFs (90º tensile) and flexural tests. The fracture surfaces of composites were studied by scanning electron microscopy (SEM). The SEM observations showed that the bridging of the MWCNTs is one of the mechanisms of transverse mechanical properties enhancement in the epoxy/MWCNT/CF composites. The results of the 90º tensile test proved that the tensile strength and elongation at break of nanocomposite with 1.0 Wt.% MWCNTs improved up to 53% and 50% in comparison with epoxy/CF laminate composite, respectively. Furthermore, the flexural strength, secant modulus, and elongation of epoxy/1.0 Wt.% MWCNT/CF hybrid nanocomposite increased 15%, 7%, and 9% compared to epoxy/CF laminate composite, respectively.

Download Full-text

Effect of Hydrophilically Functionalized Carbon Nanotubes on the Reinforcement of Water-Borne Epoxy Resin

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2011.4178 ◽

2011 ◽

Vol 11 (6) ◽

pp. 5169-5178

Author(s):

Zhiqing Mao ◽

Wei Wu ◽

Yuan Cheng ◽

Chen Xie ◽

Dunming Zhang ◽

...

Keyword(s):

Carbon Nanotubes ◽

Epoxy Resin ◽

Functionalized Carbon Nanotubes ◽

Water Borne

Download Full-text

Carbon nanotubes / epoxy resin metacomposites with adjustable radio-frequency negative permittivity and low dielectric loss

Ceramics International ◽

10.1016/j.ceramint.2018.09.253 ◽

2019 ◽

Vol 45 (1) ◽

pp. 843-848 ◽

Cited By ~ 19

Author(s):

Hongchun Luo ◽

Jun Qiu

Keyword(s):

Carbon Nanotubes ◽

Dielectric Loss ◽

Radio Frequency ◽

Epoxy Resin ◽

Negative Permittivity ◽

Low Dielectric

Download Full-text

Characterization of Mechanical and Viscoelastic Properties of SC-15 Epoxy Nanocomposites Reinforced With Multi-Walled Carbon Nanotubes, Nanoclay and Binary Nanoparticles

Volume 14: Emerging Technologies; Engineering Management, Safety, Ethics, Society, and Education; Materials: Genetics to Structures ◽

10.1115/imece2014-36176 ◽

2014 ◽

Author(s):

Tanjheel H. Mahdi ◽

Mohammad E. Islam ◽

Mahesh V. Hosur ◽

Alfred Tcherbi-Narteh ◽

S. Jeelani

Keyword(s):

Carbon Nanotubes ◽

Epoxy Resin ◽

Viscoelastic Properties ◽

Flexural Modulus ◽

Epoxy Nanocomposites ◽

Multiwalled Carbon ◽

Epoxy Resin System ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Binary Nanoparticles

Mechanical and viscoelastic properties of polymer nanocomposites reinforced with carboxyl functionalized multiwalled carbon nanotubes (COOH-MWCNT), montmorillonite nanoclays (MMT) and MWCNT/MMT binary nanoparticle were investigated. In this study, 0.3 wt. % of COOH-MWCNT, 2 wt. % of MMT and 0.1 wt. % COOH-MWCNT/2 wt. % MMT binary nanoparticles by weight of epoxy were incorporated to modify SC-15 epoxy resin system. The nanocomposites were subjected to flexure test, dynamic mechanical and thermomechanical analyses. Morphological study was conducted with scanning electron microscope. Addition of each of the nanoparticles in epoxy showed significant improvement in mechanical and viscoelastic properties compared to those of control ones. But, best results were obtained for addition of 0.1% MWCNT/2% MMT binary nanoparticles in epoxy. Nanocomposites modified with binary nanoparticles exhibited about 20% increase in storage modulus as well as 25° C increase in glass transition temperature. Flexural modulus for binary nanoparticle modified composites depicted about 30% improvement compared to control ones. Thus, improvement of mechanical and viscoelastic properties was achieved by incorporating binary nanoparticles to epoxy nanocomposites. The increase in properties was attributed to synergistic effect of MWCNTs and nanoclay in chemically interacting with each other and epoxy resin as well as in arresting and delaying the crack growth once initiated.

Download Full-text

Preparation and Mechanical Properties of Epoxy Resin Reinforced with Jeffamines-Grafted Carbon Nanotubes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.79-82.553 ◽

2009 ◽

Vol 79-82 ◽

pp. 553-556 ◽

Cited By ~ 4

Author(s):

Ling Fei Shi ◽

Gang Li ◽

Gang Sui ◽

Xiao Ping Yang

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Epoxy Resin ◽

Photoelectron Spectroscopy ◽

Epoxy Matrix ◽

Resin Matrix ◽

Mechanical And Thermal Properties ◽

Time Dynamic ◽

Multi Walled Carbon Nanotubes ◽

The Impact

The increasing proliferation and application of advanced polymer composites requires higher and broader performance resin matrices. Poly(oxypropylene) with –NH2 end-groups has been widely used to toughen epoxy resins, but the strength of resin matrix may be reduced due to the addition of flexible segments in the crosslinking network. Carbon nanotubes (CNTs) have been paid more and more attention in recent years because of their superior thermal and mechanical properties. In this paper, CNTs grafted with Jeffamines T403 were used to simultaneously improve the reinforcement and toughening of an epoxy resin. The untreated multi-walled carbon nanotubes (u-MWNTs) were functionalized with amine groups according to three steps: carboxylation, acylation, and amidation. The f-MWNTs were characterized by Fourier transform infra-red (FTIR) and X-ray photoelectron spectroscopy (XPS). The experimental results indicated that the T403 was grafted to the surface of MWCNTs. The mechanical and thermal properties of epoxy with f-MWNTs were investigated. The tensile and flexural strength increased by 7.77 % and 7.03 % after adding 0.5wt% f-MWCNTs without sacrificing the impact toughness. At the same time, dynamic mechanical thermal analysis (DMTA) showed that the glass transition temperature (Tg) of epoxy with f-MWNTs were increased. The fracture surface of epoxy with f-MWNTs was observed by scanning electron microscopy (SEM) to understand the dispersion of f-MWNTs in epoxy matrix and interfacial adhesion between f-MWNTs and epoxy matrix, which can be attributed to the strong interfacial bonding between f-MWNTs and epoxy resin.

Download Full-text