The influence of matrix viscosity on MWCNT dispersion and electrical properties in different thermoplastic nanocomposites

Effect of processing conditions on the structure, electrical and mechanical properties of melt mixed high density polyethylene/multi-walled CNT composites in compression molding

“…In general, there are three main approaches to preparing polymer/CNT nanocomposites: in situ polymerization [9], solution mixing [10] and melt mixing [11], in which melt mixing is a simpler and more effective method, particularly from an industrial perspective [12]. In recent years, many studies on the melt mixing of CNTs into polymers have been carried out which indicate that the mixing effectiveness and the dispersion of CNTs depend on many factors including the affinity between CNTs and polymer [13], polymer viscosity [14], CNTs concentration [15], residence time [15], screw speed [15] [16] and screw configuration [17].…”

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

“…The relatively complex chemistry and/or costly reagents of most functionalization procedures additionally impede a cost-effective scale-up to industrial production of the CNT-containing composites and limit their use for high price applications only [3]. A number of polymers have been tested as matrices for carbon allotrope/ thermoplastic hybrid composites, including polyamides, polyesters, aromatic polyethers, and polyolefins [11]. Among them, aliphatic polyamides are quite frequently employed since they possess a unique balance between price, processability, chemical properties and mechanical resistance.…”

High performance PA6/CNTs nanohybrid fibers prepared in the melt

“…This unexpected result can be explained considering that the functionalization partially destroyed the graphenic sp 2 structure of the CNTs walls after introducing oxygen moieties as demonstrated by the increase of the ID/IG ratio as measured by Raman spectroscopy and discussed in our previous works [5,10]. Other authors [23][24][25] while studying PA12/CNT systems found some relationship between the rheological behaviour of PA12, its end groups and the electrical conductivity of the nanocomposites. Another possible explanation of the phenomenon can also be found in the high polymer/nanotubes interactions: the polymer, completely wrapping the nanotubes, can considerably reduce the electron tunnelling that is at the base of the electrical conductivity in this kind of systems [21,22,26].…”