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Electrical resistance of CNT-PEEK composites under compression at different temperatures.

Mohiuddin M, Van Hoa S - Nanoscale Res Lett (2011)

Bottom Line: Advanced thermoplastic composites made of three different weight percentages (8%, 9%, and 10%) of multiwalled CNTs and polyether ether ketone (PEEK) were prepared by shear mixing process.The temperature- and pressure-dependent electrical resistance of these CNT-PEEK composites have been studied and presented in this paper.It has been found that electrical resistance decreases significantly with the application of heat and pressure.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical and Industrial Engineering, Concordia Centre for Composites, Centre for Applied Research on Polymers and Composites (CREPEC), Concordia University, 1455 de Maisonneuve Blvd, W Montréal, Québec, Canada H3G 1M8. mohi92@gmail.com.

ABSTRACT
Electrically conductive polymers reinforced with carbon nanotubes (CNTs) have generated a great deal of scientific and industrial interest in the last few years. Advanced thermoplastic composites made of three different weight percentages (8%, 9%, and 10%) of multiwalled CNTs and polyether ether ketone (PEEK) were prepared by shear mixing process. The temperature- and pressure-dependent electrical resistance of these CNT-PEEK composites have been studied and presented in this paper. It has been found that electrical resistance decreases significantly with the application of heat and pressure.

No MeSH data available.


Related in: MedlinePlus

Pictures of CNT-PEEK samples.
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Figure 1: Pictures of CNT-PEEK samples.

Mentions: Metallic hook was connected to a highly conductive copper wire of short length (about 300 mm) so that magnitudes of the component Rwires is much smaller than the other terms and can be ignored. Contact resistance (Rcontact) plays a significant role relative to the overall specimen resistance. Contact resistance depends on contact area, contact gap, type of junction (metallic/metallic or metallic/semiconducting) etc. Conductive silver paint [12] is commonly used to minimize the contact resistance at electrodes. In our case, under application of pressure and temperature, the contact points are expanded under compression plate which may affect the measurement of actual sample resistance. To overcome this situation and to get repeatable result, we impregnated the conductive copper mesh on both surfaces of the samples (Figure 1) by pressing them in the Wabash hot press at 340°C for 1 min with a small compaction pressure of 0.5 ton. To impregnate the copper mesh onto the round shaped CNT-PEEK sample, a very thin film of same percentage of CNT and PEEK was used on top and bottom of the sample so that the copper mesh is impregnated permanently and does not move laterally during the compression experiment. With this arrangement, the contact resistance does not change under application of compression and temperature. As such, for comparison purposes, the effect of the contact resistance on different samples can be factored out. Electrical wires are connected to the copper meshes for electrical resistance measurement.


Electrical resistance of CNT-PEEK composites under compression at different temperatures.

Mohiuddin M, Van Hoa S - Nanoscale Res Lett (2011)

Pictures of CNT-PEEK samples.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211515&req=5

Figure 1: Pictures of CNT-PEEK samples.
Mentions: Metallic hook was connected to a highly conductive copper wire of short length (about 300 mm) so that magnitudes of the component Rwires is much smaller than the other terms and can be ignored. Contact resistance (Rcontact) plays a significant role relative to the overall specimen resistance. Contact resistance depends on contact area, contact gap, type of junction (metallic/metallic or metallic/semiconducting) etc. Conductive silver paint [12] is commonly used to minimize the contact resistance at electrodes. In our case, under application of pressure and temperature, the contact points are expanded under compression plate which may affect the measurement of actual sample resistance. To overcome this situation and to get repeatable result, we impregnated the conductive copper mesh on both surfaces of the samples (Figure 1) by pressing them in the Wabash hot press at 340°C for 1 min with a small compaction pressure of 0.5 ton. To impregnate the copper mesh onto the round shaped CNT-PEEK sample, a very thin film of same percentage of CNT and PEEK was used on top and bottom of the sample so that the copper mesh is impregnated permanently and does not move laterally during the compression experiment. With this arrangement, the contact resistance does not change under application of compression and temperature. As such, for comparison purposes, the effect of the contact resistance on different samples can be factored out. Electrical wires are connected to the copper meshes for electrical resistance measurement.

Bottom Line: Advanced thermoplastic composites made of three different weight percentages (8%, 9%, and 10%) of multiwalled CNTs and polyether ether ketone (PEEK) were prepared by shear mixing process.The temperature- and pressure-dependent electrical resistance of these CNT-PEEK composites have been studied and presented in this paper.It has been found that electrical resistance decreases significantly with the application of heat and pressure.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Mechanical and Industrial Engineering, Concordia Centre for Composites, Centre for Applied Research on Polymers and Composites (CREPEC), Concordia University, 1455 de Maisonneuve Blvd, W Montréal, Québec, Canada H3G 1M8. mohi92@gmail.com.

ABSTRACT
Electrically conductive polymers reinforced with carbon nanotubes (CNTs) have generated a great deal of scientific and industrial interest in the last few years. Advanced thermoplastic composites made of three different weight percentages (8%, 9%, and 10%) of multiwalled CNTs and polyether ether ketone (PEEK) were prepared by shear mixing process. The temperature- and pressure-dependent electrical resistance of these CNT-PEEK composites have been studied and presented in this paper. It has been found that electrical resistance decreases significantly with the application of heat and pressure.

No MeSH data available.


Related in: MedlinePlus