[article]
| Titre : |
Using a carbon nanotube additive to make electrically conductive commercial polymer composites |
| Type de document : |
texte imprimé |
| Auteurs : |
Marni Rutkofky, Auteur ; Mark Banash, Auteur ; Ram Rajagopal, Auteur ; Jian Chen, Auteur |
| Année de publication : |
2006 |
| Article en page(s) : |
p. 54-55 |
| Langues : |
Américain (ame) |
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Carbon nanotubes (CNTs) have physical properties that exceed those of commonly used materials. With a tensile strength eight times of stainless steel and with a thermal conductivity five time that of copper, CNTs are obvious choices for creating a new class of composite materials. Their inclusion in a polymer or ceramic matrix holds the potential to boost the host material's electrical, mechanical, or thermal values by orders of magnitude, well above the performance possible with traditional fillers such as carbon black or ultra fine metal powders.
But although CNTs have exceptional physical properties, incorporating them into other materials has been inhibited bu the surface chemistry of carbon. Problems such as phase separation, aggregation, poor dispersion within a matrix, and poor adhesion to the host must be overcome. Zyvex has overcome these restrictions by developing a new surface treatment technology that optimizes the interaction between CNTs and the host matrix. Company researchers can create a multi-functional bridge between the CNT sidewalls and the host matrix. Company researchers can create a multi-functional bridge between the CNT sidewalls and the host material or solvent.
The power of this bridge is demonstrated in Figure 1 which shows a fracture surface in a polycarbonate composite (made using Zyvex's technology). Raw nanotubes often interact poorly with a matrix - a fracture expels them and leaves behind voids in the material. Figure 1 show that the processed tubes remain in the matrix even after the fracture, indicating strong interaction with the host.
The processed nanotubes demonstrate excellent dispersion and enhanced compatibility with commercial polymers, including polycarbonates, polystyrenes, and epoxies. With this technology, manufacturers and end-users can now take full advantage of the powerfull capabilities of the CNTs. In this note we specifically demonstrate how polymer composites with electrical conductivity spanning the range from insulating to semiconducting can be prepared with current Zyvex technology. |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23225 |
in SAMPE JOURNAL > Vol. 41, N° 2 (03-04/2005) . - p. 54-55
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