Abstract
The paper studies the electrical properties of polyamide 6‐ (PA6‐) carbon nanotubes (CNTs) nanowebs, obtained through electrospinning. Three different treatments (chemical, mechanical, and mixed) were applied to the CNT in order to prepare the electrospinning solutions. For each treatment, the CNT content was different: 0.5%, 1%, 1.5%, and 2%. The electrical volume and surface conductivity of the obtained samples were studied by measuring their electrical volume and surface resistance. Homemade plate electrodes were used. The samples were also analyzed using a scanning electron microscope (SEM) and an atomic force microscope (AFM). Defects were found on the extremities: solvent traces, flat fibers, and beads. The mixed treatment seems too aggressive and it is not recommended. The AFM analysis gave values for roughness and profile height (Ra and Rz): extreme values were obtained for the chemically and mechanically treated samples. Next, a pristine PA6 sample was used to compare the influence of the CNT content on the electric behavior of the samples. By increasing the pressure on the specimens, the volume resistivity decreased exponentially, while the surface resistivity showed no significant changes, independently of the CNT content. The obtained behavior proves a great potential of the MWNT‐PA6 reinforced nanocomposites for sensor applications.
Highlights
Fullerene, which is a third allotropy form of carbon, was discovered in 1985, after the other known forms of carbon: graphite and diamond
The paper studies the electrical properties of polyamide 6- (PA6-) carbon nanotubes (CNTs) nanowebs, obtained through electrospinning
The most famous of all carbon forms in the fields of nanoscience are carbon nanotubes (CNTs). They were observed for the first time in 1991 by Sumio Iijima, a Japanese scientist, who used a high resolution transmission electron microscope (HRTEM)
Summary
Fullerene, which is a third allotropy form of carbon, was discovered in 1985, after the other known forms of carbon: graphite and diamond (which are hybridized sp and sp, resp.). The most famous of all carbon forms in the fields of nanoscience are carbon nanotubes (CNTs). They were observed for the first time in 1991 by Sumio Iijima, a Japanese scientist, who used a high resolution transmission electron microscope (HRTEM). There are usually two distinct techniques: mechanical and chemical. The mechanical approach consists of procedures such as ultrasonication, high shear mixing, and ball milling, while the chemical approach uses surface functionalization of CNTs, in order to improve their chemical compatibility to the polymer matrix and reduce their tendency to agglomerate. Three distinct techniques were applied to the CNTs: chemical, mechanical, and mixed treatments. The last is a combination of the chemical and the mechanical treatments
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