Benzoxazine-functionalized multi-walled carbon nanotubes for preparation of electrically-conductive polybenzoxazines

Polymer ◽  
2012 ◽  
Vol 53 (1) ◽  
pp. 106-112 ◽  
Author(s):  
Yie-Hsiang Wang ◽  
Chia-Ming Chang ◽  
Ying-Ling Liu
Keyword(s):  
Carbon Nanotubes ◽  
Electrically Conductive ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Self-regulating electric heater based on elastomer, modified with multilayer carbon nanotubes

2018 ◽  
Vol 80 (3) ◽  
pp. 341-345 ◽  
Author(s):  
V. S. Yagubov ◽  
A. V. Shchegolkov
Keyword(s):  
Carbon Nanotubes ◽  
Temperature Field ◽  
Supply Voltage ◽  
Electric Heating ◽  
Heating Element ◽  
Electric Heater ◽  
Heater Surface ◽  
Electrically Conductive ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

The review of modern approaches to the development of electric heating materials makes it possible to conclude that the studies of electrically conductive composites are based on using elastomers modified with nanoscale carbon materials. In the manufacturing of electric heaters, temperature self-regulation is the main property that increases their characteristics. However, researchers engaged in studying such heaters, face difficulties associated with the magnitude of supply voltage and power. In this regard, the tasks of the present work were as follows: to study the modifier characteristics for nanomodified heaters, and to select a modifier that is best dispersed in the elastomer, which will ensure the maximum magnitude of the supply voltage and the high value of the specific power of the heater. To develop an electric heater, silicone rubber modified with carbon nanotubes was used as an elastomer. The method for manufacturing the heating element nanomodified material was described. Multi-walled carbon nanotubes synthesized through the CVD method were employed as an electrically conductive modifier. Before modifying the elastomer, the carbon nanotubes were processed in a mill at a rotational speed of working blades of 25,000 rpm. Then, the nanotubes were thermally treated in a furnace until the temperature of 110 °C was reached. After that, the nanotubes and the elastomer were mixed using a BRABENDER mixer, followed by pressing and obtaining plates of the electric heating material. To ensure contact between the heater and the power source, aluminum foil, inserted into the punches before pressing, was used. The electrical conductivity of the elastic heater nanomodified material was studied using a setup (facility) constructed especially for that purpose. Based on the results obtained, a conclusion can be made on the expediency of using different multi-walled carbon nanotubes as elastomer modifiers, which form electrically conductive networks inside the elastomer and are capable of releasing heat when connected to an electrical voltage source. Employing a non-contact method of measuring the temperature field on the electric heater surface, thermograms were recorded. It was found that the temperature field is uniformly distributed on the heater surface and is stabilized at a certain time after achieving a thermal balance with the environment. From the data obtained, it can be concluded that the heating element connected to an alternating current network with a voltage of 220 V is efficient.

scholarly journals Electrically Conductive Composite based on Functionalized Carbon Nanotubes/Epoxy Resin

2020 ◽  
Vol 9 (4) ◽  
pp. 1401-1404
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Epoxy Resin ◽  
Isopropyl Alcohol ◽  
Electrophysical Properties ◽  
Electrically Conductive ◽  
Functionalized Carbon Nanotubes ◽  
Multi Walled Carbon Nanotubes ◽  
Electrically Conductive Composite ◽  
Walled Carbon Nanotubes

This work is devoted to the study of the effect of carbon nanotubes functionalization on the electrical conductivity of composite materials based on them. Carbon nanotubes were functionalized by treatment in nitric acid and isopropyl alcohol. Changes in the morphology of multi-walled carbon nanotubes during liquid-phase functionalization were investigated using Auger-electron microscopy. Samples of composite material on the basis of initial and functionalized carbon nanotubes and epoxy resin were prepared and the concentration dependence of electrical conductivity using the four-probe method was studied. The study reveals the effect of functionalization in various solutions on the electrophysical properties of the obtained carbon nanotubes/epoxy composites.

Preparation and Characterization of Purified Multi-Walled Carbon Nanotubes Filled Conductive Adhesive

2013 ◽  
Vol 341-342 ◽  
pp. 175-178
Author(s):  
Fan Zhang ◽  
Shu Hua Qi ◽  
Yi Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Conductive Adhesives ◽  
Pressure Sensitive Adhesive ◽  
Electrically Conductive ◽  
Oxidation Treatment ◽  
Pressure Sensitive ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Xrd And Tem

In this paper, purified multi-walled carbon nanotubes (MWNTs) were obtained by acid treatment and oxidation treatment using the crude MWNTs, then purified MWNTs were filled into acrylate pressure-sensitive adhesive (PSA) to produce electrically conductive adhesives (ECAs). XRD and TEM results showed that the impurities were greatly eliminated after purification treatment. The electrical conductivity of the ECAs increased gradually as the content of the purified MWNTs increased. When the content of the purified MWNTs is 4.0vol%, the properties of ECAs are optimum.

scholarly journals Surface Engineering of Carbon-Based Microelectrodes for High-Performance Microsupercapacitors

Micromachines ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 307 ◽  
Author(s):  
Liang He ◽  
Tianjiao Hong ◽  
Yue Huang ◽  
Biao Xiong ◽  
Xufeng Hong ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Modification ◽  
Electrochemical Performance ◽  
High Performance ◽  
Surface Engineering ◽  
Electrically Conductive ◽  
Scan Rate ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Glycol Methyl Ether

In this research, the enhancement in electrochemical performance of pyrolyzed carbon microelectrodes by surface modification is investigated. For the proposed microfabrication process, pyrolyzed carbon microelectrodes with multi-walled carbon nanotubes (MWCNTs) on their surface are obtained by developing GM-1060 photoresist in mixture of propylene glycol methyl ether acetate (PGMEA) and CNTs, and following pyrolysis of a micropatterned photoresist. Polyvinyl alcohol (PVA)/H2SO4 electrolyte (1 M) was applied to assemble this carbon/CNT microelectrode-based all-solid-state microsupercapacitor (carbon/CNT-MSC). The carbon/CNT-MSC shows a higher electrochemical performance compared with that of pyrolyzed carbon microelectrode-based MSC (carbon-MSC). The specific areal and volumetric capacitances of carbon/CNT-MSC (4.80 mF/cm2 and 32.0 F/cm3) are higher than those of carbon-MSC (3.52 mF/cm2 and 23.4 F/cm3) at the scan rate of 10 mV/s. In addition, higher energy density and power density of carbon/CNT-MSC (2.85 mWh/cm3 and 1.98 W/cm3) than those of carbon-MSC (2.08 mWh/cm3 and 1.41 W/cm3) were also achieved. This facile surface modification and optimization are potentially promising, being highly compatible with modern microfabrication technologies and allowing integration of highly electrically conductive CNTs into pyrolyzed carbon to assemble MSCs with improved electrochemical performance. Moreover, this method can be potentially applied to other high-performance micro/nanostructures and microdevices/systems.

scholarly journals Relationship between Viscosity, Microstructure and Electrical Conductivity in Copolyamide Hot Melt Adhesives Containing Carbon Nanotubes

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4469
Author(s):  
Paulina Latko-Durałek ◽  
Rafał Kozera ◽  
Jan Macutkevič ◽  
Kamil Dydek ◽  
Anna Boczkowska
Keyword(s):  
Carbon Nanotubes ◽  
Electrical Conductivity ◽  
Lightning Strike ◽  
Real Problem ◽  
Conductive Adhesives ◽  
Electrically Conductive ◽  
Thermoset Composites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Hot Melt

The polymeric adhesive used for the bonding of thermoplastic and thermoset composites forms an insulating layer which causes a real problem for lightning strike protection. In order to make that interlayer electrically conductive, we studied a new group of electrically conductive adhesives based on hot melt copolyamides and multi-walled carbon nanotubes fabricated by the extrusion method. The purpose of this work was to test four types of hot melts to determine the effect of their viscosity on the dispersion of 7 wt % multi-walled carbon nanotubes and electrical conductivity. It was found that the dispersion of multi-walled carbon nanotubes, understood as the amount of the agglomerates in the copolyamide matrix, is not dependent on the level of the viscosity of the polymer. However, the electrical conductivity, analyzed by four-probe method and dielectric spectroscopy, increases when the number of carbon nanotube agglomerates decreases, with the highest value achieved being 0.67 S/m. The inclusion of 7 wt % multi-walled carbon nanotubes into each copolyamide improved their thermal stability and changed their melting points by only a few degrees. The addition of carbon nanotubes makes the adhesive’s surface more hydrophilic or hydrophobic depending on the type of copolyamide used.

scholarly journals Electrically-Conductive Composite Nanomaterial with Multi-Walled Carbon Nanotubes

2013 ◽  
Vol 04 (05) ◽  
pp. 1-7 ◽  
Author(s):  
Levan Ichkitidze ◽  
Vitally Podgaetsky ◽  
Sergei Selishchev ◽  
Eugenie Blagov ◽  
Vyacheslav Galperin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrically Conductive ◽  
Conductive Composite ◽  
Composite Nanomaterial ◽  
Multi Walled Carbon Nanotubes ◽  
Electrically Conductive Composite ◽  
Walled Carbon Nanotubes
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