Effect of functionalization of multi-walled carbon nanotube on mechanical and viscoelastic properties of polysulfide-modified epoxy nanocomposites

2016 ◽  
Vol 29 (2) ◽  
pp. 151-160 ◽  
Author(s):  
Yeping Wu ◽  
Zhongyun Gu ◽  
Maobin Chen ◽  
Chunhua Zhu ◽  
Hong Liao
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Photoelectron Spectroscopy ◽  
Epoxy Matrix ◽  
Viscoelastic Properties ◽  
Mechanical Analysis ◽  
Epoxy Nanocomposites ◽  
X Ray ◽  
Multi Walled Carbon Nanotube ◽  
Modified Epoxy

In order to obtain epoxy compounds with excellent mechanical properties without compromising other desired properties, pristine- or carboxyl-functionalized multi-walled carbon nanotube (p-MWCNT or f-MWCNT) along with polysulfide were incorporated into an amine-cured epoxy resin. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses proved the existence of carboxyl groups on the surface of f-MWCNT. Adding 0.1 wt% f-MWCNT significantly improved the tensile strength and impact strength of the epoxy nanocomposites by 104% and 47%, respectively. However, adding p-MWCNT had little effect on the mechanical properties of the nanocomposites. The glass transition temperature of the f-MWCNT/epoxy nanocomposites were also much higher than neat epoxy matrix and p-MWCNT/epoxy nanocomposites. The fracture surface morphology and dynamic mechanical analysis results indicated that the interfacial interactions between f-MWCNT and the epoxy matrix were much stronger than that of p-MWCNT, which ensured the much-improved mechanical properties.

Thiokol oligomer functionalized MWCNTs for epoxy nanocomposites

2020 ◽  
Vol 49 (5) ◽  
pp. 347-353
Author(s):  
Haosheng Wang ◽  
Zewen Li
Keyword(s):  
Mechanical Properties ◽  
Photoelectron Spectroscopy ◽  
Epoxy Matrix ◽  
Interfacial Interaction ◽  
Mechanical And Thermal Properties ◽  
Gravimetric Analysis ◽  
Epoxy Nanocomposites ◽  
Content Type ◽  
The Impact ◽  
Functionalized Mwcnts

Purpose This paper aims to feature preparation and characterization of thiokol oligomer functionalized MWCNTs/epoxy nanocomposites using low molecular weight polyamide as curing agent. Design/methodology/approach First, thiokol oligomer functionalized MWCNTs (MWCNTs-TO) were prepared through hydroxylation, silanization and graft modification of MWCNTs. The nanocomposite specimens were fabricated through sonication and cast moulding process. The authors then investigated the impact of MWCNTs-TO content on mechanical and thermal properties of the nanocomposites. Findings MWCNTs-TO with grafting ratio of 17.5 Wt.% was synthesized and characterized with X-ray photoelectron spectroscopy, thermal gravimetric analysis, Fourier transform infrared and scanning electron microscopy. The obtained epoxy nanocomposites exhibit improved mechanical properties and thermal stability with MWCNTs-TO added. Moreover, desirable results were obtained at 0.75 Wt.% of MWCNTs-TO loading: the young’s modulus, tensile, flexural and impact strength increased by 24.6,72.8,34.8 and 82.7%, respectively, compared to the neat epoxy. The improvement of mechanical properties is mainly attributed to enhanced interfacial interaction and dispersion between the covalent functionalized MWCNTs and epoxy matrix. Research limitations/implications A flexible thiokol oligomer was successfully grafted onto MWCNTs via a mild route. Nanocomposites with excellent interfacial interaction and dispersion between MWCNTs-TO and the epoxy matrix have been successfully fabricated and investigated. Practical implications This method provided a mild and practical approach to improve the performance of MWCNTs epoxy nanocomposites. Originality/value A flexible thiokol oligomer was successfully covalent grafted onto MWCNTs via a mild route. Nanocomposites with excellent interfacial interaction and dispersion between MWCNTs-TO and the epoxy matrix have been successfully fabricated and investigated.

Electromagnetic and microwave absorbing performance of ultra-thin Fe attached carbon nanotube hybrid buckypaper

2014 ◽  
Vol 07 (02) ◽  
pp. 1450006 ◽  
Author(s):  
Shaowei Lu ◽  
Xianjun Zeng ◽  
Peng Nie ◽  
Chunlin Feng ◽  
Xuhai Xiong ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Photoelectron Spectroscopy ◽  
Experimental Result ◽  
Light Weight ◽  
Vibrating Sample Magnetometer ◽  
Frequency Range ◽  
Filtration Method ◽  
Vacuum Filtration ◽  
X Ray ◽  
Multi Walled Carbon Nanotube

The ultra-thin Fe attached multi-walled carbon nanotube hybrid buckypaper ( Fe /MWCNT hybrid buckypaper) was fabricated by vacuum filtration method with monodispersion solutions of MWCNTs and Fe nanoparticles. The morphology, element composition and magnetic properties of buckypapers were characterized by field-emission scanning electron microscope, X-ray photoelectron spectroscopy (XPS) and vibrating sample magnetometer. The complex permittivity and permeability, the reflection loss (RL) properties of buckypapers attached composite were investigated in the frequency range of 12.4–18 GHz. The Fe /MWCNTs hybrid buckypaper attached composite posses much broader absorbing bandwidth and larger reflectivity than those of pure MWCNTs buckypaper attached composite with the same absorbing thickness (dm = 0.1 mm). The best reflectivity below -5 dB is at 14.0–18 GHz, and the minimum value is -14.4 dB at 16.8 GHz. The experimental result indicates that Fe /MWCNTs hybrid buckypaper has potential application in thin thickness and light-weight microwave absorbers.

Effects of nano reinforcing/matrix interaction on chemical, thermal and mechanical properties of epoxy nanocomposites

2021 ◽  
pp. 002199832110370
Author(s):  
Şakir Yazman ◽  
Mesut Uyaner ◽  
Fazliye Karabörk ◽  
Ahmet Akdemir
Keyword(s):  
Mechanical Properties ◽  
Epoxy Matrix ◽  
Tensile Tests ◽  
Morphological Properties ◽  
Physical Interaction ◽  
Thermal And Mechanical Properties ◽  
Epoxy Nanocomposites ◽  
Matrix Interaction ◽  
Multi Walled Carbon Nanotube ◽  
The Impact

This article investigates the impact of addition various types of nanoparticles with different structural, dimensional, and morphological properties on the interphase region formed between the particle/matrix and the curing behavior of the epoxy affect the nanocomposite material properties. For this purpose, epoxy nanocomposites (NCs) were produced by adding multi-walled carbon nanotube (MWCNT) and alumina (Al2O3) nanoparticles (NPs) into the epoxy matrix at different rates (0.5–2.0 wt.%). The effects of the particle/matrix interaction on the properties of the composite have been revealed by chemical, thermal, mechanical analyzes and microstructure investigations. An increase in the absorption density, which reveals the physical interaction of nanoparticles with the epoxy matrix, was observed in Fourier-transform infrared spectroscopy. Absorption vibration peak intensities in nanocomposite samples were at most 1.0 wt.% Al2O3 and 1.25 wt.% CNT added nanocomposites. It was observed that the Tg value increased depending on the number of nanoparticles. The addition of Al2O3 increased Tg values more than CNT. Besides, the mechanical properties of NCs were determined by tensile tests. The highest increase in mechanical properties was achieved by adding 1.25 wt.% CNT and 1.0 wt.% Al2O3, respectively. Mechanical properties tended to decrease at higher addition rates. The shape, size, amount, and distribution of nanoparticles added into the epoxy matrix directly affected the NCs' properties. It has been determined that homogeneously dispersed spherical Al2O3 nanoparticles are more effective than fiber-shaped CNTs in the properties of NCs.

scholarly journals Single-step process to improve the mechanical properties of carbon nanotube yarn

2018 ◽  
Vol 9 ◽  
pp. 545-554 ◽  
Author(s):  
Maria Cecilia Evora ◽  
Xinyi Lu ◽  
Nitilaksha Hiremath ◽  
Nam-Goo Kang ◽  
Kunlun Hong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Single Step ◽  
Beam Irradiation ◽  
X Ray ◽  
Yarn Strength ◽  
Irradiation Process

Carbon nanotube (CNT) yarns exhibit low tensile strength compared to conventional high-performance carbon fibers due to the facile sliding of CNTs past one another. Electron beam (e-beam) irradiation was employed for in a single-step surface modification of CNTs to improve the mechanical properties of this material. To this end, CNT yarns were simultaneously functionalized and crosslinked using acrylic acid (AA) and acrylonitrile (AN) in an e-beam irradiation process. The chemical modification of CNT yarns was confirmed by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy and scanning electron microscopy (SEM). The best improvement in mechanical properties was achieved on a sample treated with an aqueous solution of AA and subsequent irradiation. CNT yarn treatment with AA enhanced the strength (444.5 ± 68.4 MPa) by more than 75% and the modulus (21.5 ± 0.6 GPa) by more than 144% as compared to untreated CNT yarn (strength 251 ± 26.5 MPa and modulus 8.8 ± 1.2 GPa).

Study on Morphology and Thermo-Mechanical Properties of Carbon Nanotube-Modified Polycarbonate

2013 ◽  
Vol 750-752 ◽  
pp. 332-335
Author(s):  
Teng Fei Shen ◽  
Fa Chao Wu
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Aspect Ratio ◽  
Loss Modulus ◽  
Viscoelastic Behavior ◽  
Mechanical Analysis ◽  
Interface Modification ◽  
Frequency Space ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotube

In this work, a series of multi-walled carbon nanotube (MWNT)/polycarbonate (PC) composites were prepared. A combined experimental of transmission electron microscope (TEM) and dynamic mechanical analysis (DMA) were used to study on the morphology and thermo-mechanical properties of MWNT/PC composites as a function of MWNT aspect ratio. The results showed that smaller aspect ratio nanotubes lead to greater broadening of the loss modulus peak in frequency space, however, there was no effect of aspect ratio on the glass transition temperature. The breadth of the loss modulus peak was found to correlate with the free space parameter, a measure of the spacing between the MWNTs. These results shed light on the separate impacts of aspect ratio, dispersion, and interface modification on the viscoelastic behavior of prepared MWNT/PC composites.

One-pot synthesis of aminated multi-walled carbon nanotube using thiol-ene click chemistry for improvement of epoxy nanocomposites properties

RSC Advances ◽  
2015 ◽  
Vol 5 (119) ◽  
pp. 98692-98699 ◽  
Author(s):  
Omid Zabihi ◽  
Mojtaba Ahmadi ◽  
Mostafa Akhlaghi bagherjeri ◽  
Minoo Naebe
Keyword(s):  
Carbon Nanotube ◽  
Click Chemistry ◽  
Epoxy Matrix ◽  
Epoxy Nanocomposites ◽  
Interfacial Interactions ◽  
One Pot ◽  
One Pot Synthesis ◽  
Multi Walled Carbon Nanotube

A non-oxidative method based on thiol-ene click chemistry for functionalization of multi-walled carbon nanotube (CNT) was performed in order to improve the interfacial interactions between epoxy matrix and CNT.

The Mechanical Properties of Organic Modified Epoxy Resin

2020 ◽  
Vol 43 (3) ◽  
pp. 10-14
Author(s):  
Georgel MIHU ◽  
Claudia Veronica UNGUREANU ◽  
Vasile BRIA ◽  
Marina BUNEA ◽  
Rodica CHIHAI PEȚU ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Epoxy Resins ◽  
Mechanical Tests ◽  
Organic Modification ◽  
Three Point Bending ◽  
Modified Epoxy

Epoxy resins have been presenting a lot of scientific and technical interests and organic modified epoxy resins have recently receiving a great deal of attention. For obtaining the composite materials with good mechanical proprieties, a large variety of organic modification agents were used. For this study gluten and gelatin had been used as modifying agents thinking that their dispersion inside the polymer could increase the polymer biocompatibility. Equal amounts of the proteins were milled together and the obtained compound was used to form 1 to 5% weight ratios organic agents modified epoxy materials. To highlight the effect of these proteins in epoxy matrix mechanical tests as three-point bending and compression were performed.

scholarly journals Photoluminescent Properties of Hydroxyapatite and Hydroxyapatite/Multi-Walled Carbon Nanotube Composites

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 832
Author(s):  
Edna X. Figueroa-Rosales ◽  
Javier Martínez-Juárez ◽  
Esmeralda García-Díaz ◽  
Daniel Hernández-Cruz ◽  
Sergio A. Sabinas-Hernández ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Hexagonal Phase ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Multi Walled Carbon Nanotube ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites ◽  
Co Precipitation ◽  
Functionalized Mwcnts

Hydroxyapatite (HAp) and hydroxyapatite/multi-walled carbon nanotube (MWCNT) composites were obtained by the co-precipitation method, followed by ultrasound-assisted and microwave radiation and thermal treatment at 250 °C. X-ray diffraction (XRD) confirmed the presence of a hexagonal phase in all the samples, while Fourier-transform infrared (FTIR) spectroscopy elucidated the interaction between HAp and MWCNTs. The photoluminescent technique revealed that HAp and the composite with non-functionalized MWCNTs present a blue luminescence, while the composite with functionalized MWCNTs, under UV-vis radiation shows an intense white emission. These findings allowed presentation of a proposal for the use of HAp and HAp with functionalized MWCNTs as potential materials for optoelectronic and medical applications.

scholarly journals The Potential for Natural Stones from Northeastern Brazil to Be Used in Civil Construction

Minerals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 440
Author(s):  
Fabiana Pereira da Costa ◽  
Jucielle Veras Fernandes ◽  
Luiz Ronaldo Lisboa de Melo ◽  
Alisson Mendes Rodrigues ◽  
Romualdo Rodrigues Menezes ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Chemical Resistance ◽  
Mechanical Analysis ◽  
Northeastern Brazil ◽  
X Ray Diffraction ◽  
X Ray ◽  
Chemical Agents ◽  
Natural Stones

Natural stones (limestones, granites, and marble) from mines located in northeastern Brazil were investigated to discover their potential for use in civil construction. The natural stones were characterized by chemical analysis, X-ray diffraction, differential thermal analysis, and optical microscopy. The physical-mechanical properties (apparent density, porosity, water absorption, compressive and flexural strength, impact, and abrasion) and chemical resistance properties were also evaluated. The results of the physical-mechanical analysis indicated that the natural stones investigated have the potential to be used in different environments (interior, exterior), taking into account factors such as people’s circulation and exposure to chemical agents.

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