scholarly journals Functionalized multiwalled carbon nanotubes for UV coating

2017 ◽  
Vol 46 (1) ◽  
pp. 1-13
Author(s):  
Tuba Çakır Çanak ◽  
Ömer Faruk Vurur ◽  
İ. Ersin Serhatlı
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Analytical Techniques ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Multiwalled Carbon ◽  
Content Type ◽  
Moulding Process

Purpose This paper aims to investigate effects of acrylic functionalisation of multiwalled carbon nanotubes (MWCNTs) on properties of carbon nanotubes/epoxy nanocomposites. Design/methodology/approach A number of analytical techniques, including Fourier transform infrared spectroscopy, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy, were used to assess the effects of acid treatment on MWCNTs. Ultraviolet-curable coatings were fabricated by sonication and cast moulding process. The mechanical properties of MWCNTs/epoxy composites at different weight fractions were evaluated by performing tensile tests and dynamic mechanical analysis tests. Also, gel contents were examined. Findings It was found that addition of nanotubes monomer to epoxy formulations had significant effect on the viscoelastic and mechanical properties. Practical implications Improving dispersion and alignment of MWCNTs in the composite matrix will contribute to the development of resin/MWCNTs nanocomposites and promote the applications. Originality/value The paper establishes a method to introduce MWCNTs into epoxy matrix as a monomer to enhance the photo curable and dispersion properties of the MWCNT/epoxy films.

scholarly journals Polymeric Composites Based on Polyurea Matrix Reinforced with Carbon Nanotubes

2017 ◽  
Vol 54 (1) ◽  
pp. 41-44 ◽  
Author(s):  
Maria Adina Vulcan ◽  
Celina Damian ◽  
Paul Octavian Stanescu ◽  
Eugeniu Vasile ◽  
Razvan Petre ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Scanning Electron Microscopy ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Scanning Electron

This paper deals with the synthesis of polyurea and its use as polymer matrix for nanocomposites reinforced with multi-walled carbon nanotubes (MWCNT). Two types of materials were obtained during this research, the first cathegory uses the polyurea as matrix and the second one uses a mixture between epoxy resin and polyurea. The nanocomposites were characterized by Thermogravimetric Analysis (TGA), Dynamic Mechanical Analysis (DMA), Scanning Electron Microscopy (SEM) and Tensile Tests .The elastomeric features of nanocomposites were highlighted by the results which showed low value of Tg. Also higher thermal stability with ~40oC compared with commercial products (M20) were observed, but lower mechanical properties compared to neat polyurea.

Multiwalled Carbon Nanotubes-Incorporated Polyurethane Nanocomposites

2008 ◽  
Vol 47-50 ◽  
pp. 1109-1112
Author(s):  
Ye Seul Kim ◽  
Rira Jung ◽  
Hun Sik Kim ◽  
Hyoung Joon Jin
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Multiwalled Carbon Nanotubes ◽  
Physical And Mechanical Properties ◽  
High Reactivity ◽  
Multiwalled Carbon ◽  
Contact Points ◽  
Conductive Fillers

Polyurethane was used as adhesive due to high reactivity, high flexibility, and mechanical properties. Electrically conductive adhesives (ECAs) are an alternative to tin-lead solder in order to provide conductive paths between two electrical device components, which typically consist of a polymeric resin that contributes physical and mechanical properties, and conductive fillers. However, ECAs have low electrical conductivity and unstable network due to large contact points of the few micrometer-sized metal particles. In order to overcome these restrictions, multiwalled carbon nanotubes (MWCNTs) with high aspect ratio and smaller nanometer scale can be used as conductive fillers. In this study, ECAs were based on polyurethane filled with two kinds of fillers, raw MWCNTs and acid treated MWCNTs, respectively. Electrical conductivity was measured by using four-point probe. Morphology and dispersibility of fillers were observed by scanning electron microscopy and transmission electron microscopy.

Enhancement in mechanical properties and conductivity of modified epoxy resin composites

2017 ◽  
Vol 30 (10) ◽  
pp. 1169-1182 ◽  
Author(s):  
Changlong Bi ◽  
Dongyu Zhao
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Epoxy Resin ◽  
Multiwalled Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
High Performance ◽  
Mechanical Analysis ◽  
Polymer Materials ◽  
Multiwalled Carbon ◽  
Ep Matrix

Nanosilver and nanonickel were first loaded on the surfaces of multiwalled carbon nanotubes (MWCNTs) by liquid-phase reduction method and the multiwalled carbon nanotubes/nanosilver-nickel (MWCNTs/Ag-Ni) composites were formed. The MWCNTs/Ag-Ni were homogeneously dispersed in the epoxy resin (EP), which can form epoxy resin/multiwalled carbon nanotubes/nanosilver-nickel (EP/MWCNTs/Ag-Ni) composites. The results based on X-ray photoelectron spectroscopy show the chemical bonds in the MWCNTs/Ag-Ni. By the scanning electron microscope method, it can be concluded that the enhancement in mechanical properties is due to the strong interaction between MWCNTs and the EP matrix. It is proved that through the comparative tests, the addition of nanosliver-nickel rigid particles can enhance the interaction between MWCNTs and the EP matrix, which can improve the mechanical properties of modified EP. Compared with the pure EP, the tensile strength and impact strength of nanocomposites improve around 81% and 139% by adding 1.3 wt% MWCNTs/Ag-Ni. In addition, the experimental results based on dynamic mechanical analysis (DMA) show that the glass transition temperature of modified EP (1.3 wt% MWCNTs/Ag-Ni in EP matrix) is significantly increased by about 18.6°C. Compared with the pure EP, the conductivity of modified EP (1.3 wt% MWCNTs/Ag-Ni in EP matrix) is also increased by around 63%. Because of the excellent mechanical properties and conductivity of EP/MWCNTs/Ag-Ni nanocomposites, the development of high-performance polymer materials will be greatly achieved.

Augmentation in tribological performance of polyalphaolefins by COOH- functionalized multiwalled carbon nanotubes as an additive in boundary lubrication conditions

2021 ◽  
pp. 1-27
Author(s):  
Homender Kumar ◽  
Harsha A P
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Friction And Wear ◽  
Analytical Techniques ◽  
Wear Volume ◽  
Wear Properties ◽  
Multiwalled Carbon ◽  
X Ray ◽  
Functionalized Multiwalled Carbon Nanotubes

Abstract This current study emphasized the tribological performances of COOH-functionalized multiwalled carbon nanotubes (MWCNTs) dispersed in two different grades of polyalphaolefins (i.e., PAO 4 and PAO 6). The friction and wear properties have been estimated using SRV 5 tribometer with “ball on disc” configuration. Prior to tribo-testing, MWCNTs were characterized by X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), and Fourier transform infrared spectroscopy (FTIR). The varying dose of MWCNTs (0.025-0.15 wt.%) was incorporated into both PAO base oils to obtain the optimized lubrication behaviour. The test results revealed that PAO 4 exhibited a reduction in friction coefficient (~27%) and wear volume (~88 %) at a dose of 0.05 wt.% and 0.025 wt.% MWCNTs, respectively. However, in PAO 6, the minimum coefficient of friction and wear volume was obtained at a concentration of 0.075 wt.% and 0.05 wt. % of the additive. The results evidenced that PAO 6 based nanolubricants demonstrated the best frictional characteristics while attained the best anti-wear performance with PAO 4 based nanolubricants. For the better unveiling of the lubrication mechanism of MWCNTs, worn surfaces were characterized using various analytical techniques such as scanning electron microscopy (SEM), scan probe microscope (SPM), energy-dispersive X-ray spectroscopy (EDS) and X-ray photoelectron microscopy (XPS).

Effect of Multiwalled Carbon Nanotubes On Mechanical Properties of Concrete

2012 ◽  
Vol 2 (6) ◽  
pp. 166-168 ◽  
Author(s):  
Dr.T.Ch.Madhavi Dr.T.Ch.Madhavi ◽  
◽  
Pavithra.P Pavithra.P ◽  
Sushmita Baban Singh Sushmita Baban Singh ◽  
S.B.Vamsi Raj S.B.Vamsi Raj ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

SILK FIBROIN FILMS CRYSTALLIZED BY MULTIWALLED CARBON NANOTUBES

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1807-1812 ◽  
Author(s):  
H.-S. KIM ◽  
W.-I. PARK ◽  
Y. KIM ◽  
H.-J. JIN
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Silk Fibroin ◽  
Composite Films ◽  
Tensile Modulus ◽  
Multiwalled Carbon ◽  
Regenerated Silk Fibroin ◽  
Silk Films ◽  
Β Sheet

Silk films prepared from regenerated silk fibroin are normally stabilized by β-sheet formation through the use of solvents (methanol, water etc.). Herein, we report a new method of preparing water-stable films without a β-sheet conformation from regenerated silk fibroin solutions by incorporating a small amount (0.2 wt%) of multiwalled carbon nanotubes (MWCNTs). To extend the biomaterial utility of silk proteins, forming water-stable silk-based materials with enhanced mechanical properties is essential. Scanning electron microscopy and transmission electron microscopy were used to observe the morphology of the MWCNT-incorporated silk films. The wide-angle X-ray diffraction provided clear evidence of the crystallization of the silk fibroin induced by MWCNT in the composite films without any additional annealing processing. The tensile modulus and strength of the composite films were improved by 108% and 51%, respectively, by the incorporation of 0.2 wt% of MWCNTs, as compared with those of the pure silk films. The method described in this study will provide an alternative means of crystallizing silk fibroin films without using an organic solvent or blending with any other polymers, which may be important in biomedical applications.

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