Structure and properties of multi-walled carbon nanotube porous sheets with enhanced elongation

Abstract

In this article, multi-walled carbon nanotubes (MWNTs)/dodecyl benzene sulfonic acid (DBSA) porous sheet networks (PSNs) of enhanced extensibility were developed and characterized. The MWNT/DBSA networks possess failure strains of 8-12 %, markedly higher than the literature reported values of 0.5-4 %. The networks were prepared through micro-filtration of highly dispersed MWNT in DBSA aqueous solutions. The DBSA molecule has two functions: In the dispersion stage, DBSA functions as a dispersant leading to the establishment of stable individually dispersed MWNT, and in the MWNT porous sheet, the presence of DBSA within the nanotubes' network creates a lubrication-like effect, enhancing the networks' extensibility. In fact, it was found that DBSA is assembled in two modes within the nanotubes' network: a fraction which is strongly adsorbed onto the CNT surface, and another fraction entrapped within the network as a DBSA/water solution. It should be noted that the composition of these systems is stable under ambient room temperature conditions. Comparison of MWNT networks prepared from the MWNT/DBSA dispersions and from the same but coagulated before filtration has shown superiority of the non-coagulated systems in relation to structure and mechanical properties. The prepared MWNT/DBSA PSNs of enhanced extensibility were developed without any modification by polymers, and they are characterized by high electrical conductivity and nano-porosity.

Moisture and temperature influence on mechanical behavior of PPS/buckypapers carbon fiber laminates

“…Where v PPS , v Cf and v BP are the volume fraction of PPS, CF and BP in the composite; ρ PPS is the density of the PPS and equals to 1.35 g cm −3 ; ρ CF is the density of the CF and equals to 1.77 g cm −3 ; ρ PPS/CF is the density of the PPS/CF composite, which is obtained by dividing the mass of a composite sample by its volume; w PPS and w CF are the weigh fraction of the PPS and CF in the composite. For the (5), ρ PPS/BP/CF is the density of PPS/CF/BP composite, which is obtained by dividing the mass of a composite sample by its volume; w BP is the weight fraction of the BP in the composite and ρ BP is the density of the as-prepared BP, which is estimated to be 0.46 g cm −3 , agree with the BP density reported in the literature [32,34]. Scanning electron microscopy (SEM) was used to compare the impregnation grade between the PPS, BP and CF reinforcement and the composites defects, this was carried out in a FEI Inspect S50 microscopy.…”

Microstructure and fractography of multiwalled carbon nanotube reinforced unsaturated polyester nanocomposites

“…Incorporation of nano‐sized fillers, in polymers is generally referred to as nanocomposites. Nanocomposites have attracted great interest due to their wide possible range of applications and commercial opportunities . Nano filler not only improve the mechanical properties but also restrained the deterioration of outdoor application properties and increased the thermal stability.…”

The structure and electro‐mechanical properties of novel hybrid CNT/PANI nanocomposites

“…The differences in thermal stability are due to structural differences observed in the HRSEM micrographs. The precipitation‐filtration route included purging of unbound DBSA from the solution by methanol, thus resulted in a stiffer network, a more thermo‐stable product .…”