Influence of small scale melt mixing conditions on electrical resistivity of carbon nanotube-polyamide composites

Polyamide 6/Multiwalled Carbon Nanotubes Nanocomposites with Modified Morphology and Thermal Properties

“…Secondly, carbon nanotubes, whether unmodified or modified through chemical functionalization, improve the crystalline nature of PA6 by offering nucleation sites on nanotubes sidewalls. In our study, the T C value obtained from addition of 0.5 wt % amine-functionalized CNTs is in the same range as that reported for incorporation of 2 wt % pristine-CNTs using melt mixing [22] and higher than those reported for PA6 composites containing pristine or COOH-functionalized nanotubes produced via the in situ polymerization process [23]. Also, functionalized nanotubes are better than pristine CNTs due to their better dispersion characteristics and strong PA6/CNT interfacial adhesion.…”

Reactive microencapsulation of carbon allotropes in polyamide shell-core structures and their transformation in hybrid composites with tailored electrical properties

“…A clear trend toward GR filler chemical modification is observed mainly by oxidation and polymer grafting in order to increase the miscibility with the polyamide matrix [27,28]. In all the polyamide/carbon allotrope composites mentioned so far melt mixing was used as dispersion method, whereby frequently the reported percolation thresholds in CNT-modified hybrids were found to be much higher than the theoretical ones [15]. Studies on shaping of PA6/CNT composites by injection molding revealed that high conductivity values (measured both in-line and in the finished part) can only be achieved at maximum melt temperature and minimum injection speed [29].…”

“…Among them, aliphatic polyamides are quite frequently employed since they possess a unique balance between price, processability, chemical properties and mechanical resistance. Thus, polyamide 6 (PA6), polyamide 12 (PA12) and polyamide 6.6 (PA66) have been melt-mixed with different grades of CNT for studying the structure, morphology, mechanical and electrical properties of the resulting hybrid composites [3,[12][13][14][15][16][17][18][19][20]. It seems that the extremely high stiffness, electrical and thermal conductivity combined with their high aspect ratio makes CNT suitable fillers for conductive polyamide nanocomposites with prospective applications in electronics, packaging and automotive industries.…”

Estudo das propriedades elétricas e térmicas de compósitos nanoestruturados de poli(sulfeto de fenileno) reforçados com nanotubos de carbono

“…Mesmo que haja opiniões divergentes na literatura, se os nanotubos são cobertos por camadas cristalinas ou se estão localizados nas regiões amorfas dos polímeros semicristalinos, é aceito que a condutividade elétrica de compósitos nanoestruturados é fortemente influenciada pela formação da rede cristalina. Se as camadas cristalinas se formarem ao redor dos CNTs, cujos tamanhos dependem da quantidade do reforço e do seu estado de dispersão, elevados níveis de capacitância estarão associados as zonas de contato entre os tubos, reduzindo assim a condutividade elétrica do sistema [18] .…”