Processing and characterization of thermoplastic nanocomposite fibers of hot melt copolyamide and carbon nanotubes

2017 ◽  
Vol 31 (3) ◽  
pp. 359-375 ◽  
Author(s):  
Paulina Latko-Durałek ◽  
Kamil Dydek ◽  
Michał Sobczakand ◽  
Anna Boczkowska
Keyword(s):  
Carbon Nanotubes ◽  
Mechanical Performance ◽  
Fiber Surface ◽  
Average Diameter ◽  
Multifunctional Composites ◽  
Adhesive Properties ◽  
Multi Walled Carbon Nanotubes ◽  
Nanocomposite Fibers ◽  
Walled Carbon Nanotubes ◽  
Hot Melt

In this study, thermoplastic nanocomposite fibers based on hot melt copolyamide and multi-walled carbon nanotubes (MWCTs) were fabricated with a two-step approach. In the first step, a masterbatch containing 20 wt% MWCTs was diluted by pure hot melts to produce nanocomposite pellets with 2, 4, and 6 wt% MWCTs. In the second step, nanocomposite fibers were extruded and drawn from the fabricated pellets. The selected processing conditions resulted in fibers with an average diameter of 80 μm. Rheological behavior of hot melt copolyamide changes dramatically after the addition of carbon nanotubes (CNTs). Crystallinity content expressed by enthalpy of melting is higher in the fibers than in the pellets. Microscopic examination shows that MWCTs are randomly oriented in the direction of the extrusion. The mechanical performance of the fibers shows decreased elongation at break for fibers with MWCTs and an increase in Young’s modulus. A strong influence of fiber surface quality on mechanical properties was also indicated. Thermoplastic nanocomposites fibers with MWCTs, based on hot melt copolyamide, are a new group of materials that can be applied as multifunctional composites for aviation, automotive, military, medical and electronic industries due to their adhesive properties, low melting range as well as electrical properties.

scholarly journals Fibers of Thermoplastic Copolyamides with Carbon Nanotubes for Electromagnetic Shielding Applications

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5699
Author(s):  
Paulina Latko-Durałek ◽  
Povilas Bertasius ◽  
Jan Macutkevic ◽  
Juras Banys ◽  
Anna Boczkowska
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Properties ◽  
Electromagnetic Shielding ◽  
Broadband Dielectric Spectroscopy ◽  
Degree Of Orientation ◽  
Multi Walled Carbon Nanotubes ◽  
Nanocomposite Fibers ◽  
Melt Adhesives ◽  
Walled Carbon Nanotubes ◽  
Hot Melt

Polymer composites containing carbon nanofillers are extensively developed for electromagnetic shielding applications, where lightweight and flexible materials are required. One example of the microwave absorbers can be thermoplastic fibers fabricated from copolyamide hot melt adhesives and 7 wt % of multi-walled carbon nanotubes, as presented in this paper. A broadband dielectric spectroscopy confirmed that the addition of carbon nanotubes significantly increased microwave electrical properties of the thin (diameter about 100 μm) thermoplastic fibers. Moreover, the dielectric properties are improved for the thicker fibers, and they are almost stable at the frequency range 26–40 GHz and not dependent on the temperature. The variances in the dielectric properties of the fibers are associated with the degree of orientation of carbon nanotubes and the presence of bundles, which were examined using a high-resolution scanning microscope. Analyzing the mechanical properties of the nanocomposite fibers, as an effect of the carbon nanotubes addition, an improvement in the stiffness of the fibers was observed, together with a decrease in the fibers’ elongation and tensile strength.

Bioactive poly(etheretherketone) composite containing calcium polyphosphate and multi-walled carbon nanotubes for bone repair: Mechanical property and in vitro biocompatibility

2018 ◽  
Vol 33 (5) ◽  
pp. 543-557 ◽  
Author(s):  
Jianfei Cao ◽  
Yue Lu ◽  
Hechun Chen ◽  
Lifang Zhang ◽  
Chengdong Xiong
Keyword(s):  
Mechanical Property ◽  
Carbon Nanotubes ◽  
Bone Repair ◽  
Mechanical Performance ◽  
Injection Molding Process ◽  
Molding Process ◽  
Calcium Polyphosphate ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Poly(etheretherketone) exhibits good biocompatibility, excellent mechanical properties, and bone-like stiffness. However, the natural bio-inertness of pure poly(etheretherketone) hinders its applications in biomedical field, especially when direct bone-implant osteo-integration is desired. For developing an alternative biomaterial for load-bearing orthopedic application, combination of bioactive fillers with poly(etheretherketone) matrix is a feasible approach. In this study, a bioactive multi-walled carbon nanotubes/calcium polyphosphate/poly(etheretherketone) composite was prepared through a compounding and injection-molding process for the first time. Bioactive calcium polyphosphate was added to polymer matrix to enhance the bioactivity of the composite, and incorporation of multi-walled carbon nanotubes to composite was aimed to improve both the mechanical property and biocompatibility. Furthermore, the microstructures, surface hydrophilicity, and mechanical property of multi-walled carbon nanotubes/calcium polyphosphate/poly(etheretherketone) composite, as well as the cellular responses of MC3T3-E1 osteoblast cells to this material were investigated. The mechanical testing revealed that mechanical performance of the resulting ternary composite was significantly enhanced by adding the multi-walled carbon nanotubes and the mechanical values obtained were close to or higher than those of human cortical bone. More importantly, cell culture tests showed that initial cell adhesion, cell viability, and osteogenic differentiation of MC3T3-E1 cells were significantly promoted on the multi-walled carbon nanotubes/calcium polyphosphate/poly(etheretherketone) composite. Accordingly, the multi-walled carbon nanotubes/calcium polyphosphate/poly(etheretherketone) composite may be used as a promising bone repair material in dental and orthopedic applications.

scholarly journals Achieving Mechanical and Conductive Anisotropy in Carbon Nanotubes/Cu Composites

2021 ◽  
Vol 2101 (1) ◽  
pp. 012056
Author(s):  
Diabo Enana Rodophe Olivier ◽  
Zhong Zheng ◽  
Fang Xing ◽  
Jiafeng Tao
Keyword(s):  
Carbon Nanotubes ◽  
Phonon Scattering ◽  
Mechanical Performance ◽  
Strengthening Mechanism ◽  
Matrix Composites ◽  
Electron Phonon Coupling ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Better Than ◽  
Orthogonal Anisotropy

Abstract Cu matrix composites reinforced by Multi-walled Carbon Nanotubes (MWCNTs) were prepared aiming to enhance the mechanical performance of Cu through MWCNTs while preserving its excellent axial conductivity. The microscopic structure, mechanical performance and electroconductivity of the composites were characterized, and the related mechanism was discussed. MWCNTs dispersed uniformly in Cu matrix and arranged in the direction of drawing. The composites showed obvious orthogonal anisotropy. The mechanical properties of the composites increased with the content of MWCNTs. The composite with 10vol.% MWCNTs has the best strength and hardness, which was better than most of data in the literature. However, the highest enhancement efficiency of 3vol.%-MWCNTs/Cu composite was the highest. The main enhancement mechanism was load transmission effects and dislocation. The electroconductivity and thermal conductivity of 5vol.%-MWCNTs/Cu composite parallel to the drawing direction reached the maximum value. The main strengthening mechanism was that Ni-Cu coating on MWCNTs leads to strong interface combination between MWCNTs and Cu, which promotes the electron-phonon coupling and reduces electron or phonon scattering at the interface.

Control of the Length and Density of Carbon Nanotubes Grown on Carbon Fiber for Composites Reinforcement

2015 ◽  
Vol 1752 ◽  
pp. 77-82 ◽  
Author(s):  
Lays D. R. Cardoso ◽  
Vladimir J. Trava-Airoldi ◽  
Fabio S. Silva ◽  
Hudson G. Zanin ◽  
Erica F. Antunes ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Fiber ◽  
Deposition Temperature ◽  
Fiber Surface ◽  
Precursor Solution ◽  
Deposition Technique ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Elevated Exposure ◽  
Very High

ABSTRACTAligned multi-walled carbon nanotubes were grown on carbon fiber surface in order to provide a way to tailor the thermal, electrical and mechanical properties of the fiber-resin interface of a polymer composite. As the deposition temperature of the nanotubes is very high, an elevated exposure time can lead to degradation of the carbon fiber. To overcome this obstacle we have developed a deposition technique where the fiber is exposed to an atmosphere of growth for just one minute, and different concentrations of precursor solution were used.

scholarly journals Discovery of carbon nanotubes in sixth century BC potteries from Keeladi, India

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Manivannan Kokarneswaran ◽  
Prakash Selvaraj ◽  
Thennarasan Ashokan ◽  
Suresh Perumal ◽  
Pathikumar Sellappan ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Photoelectron Spectroscopy ◽  
Average Diameter ◽  
Sixth Century ◽  
Nano Materials ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

AbstractUnique black coatings were observed in the inner wall of pottery shreds excavated from Keeladi, Tamilnadu, India. Raman spectroscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy were used to understand the nature of the coating. The analysis revealed the presence of single, multi-walled carbon nanotubes and layered sheets in the coating. The average diameter of single-walled carbon nanotube found to be about 0.6 ± 0.05 nm. This is the lowest among the single-walled carbon nanotubes reported from artefacts so far and close to the theoretically predicted value (0.4 nm). These nanomaterials were coated in the pottery’s that date backs to sixth century BC, and still retain its stability and adhesion. The findings of nano materials in the pre-historic artifacts, its significance and impact are discussed in this article.

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