scholarly journals Experimental Investigation of Polypropylene Composite Drawn Fibers with Talc, Wollastonite, Attapulgite and Single-Wall Carbon Nanotubes

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 260
Author(s):  
Costas Tsioptsias ◽  
Konstantinos Leontiadis ◽  
Stavros Messaritakis ◽  
Aikaterini Terzaki ◽  
Panagiotis Xidas ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Material Characterization ◽  
Synergistic Effects ◽  
Tensile Tests ◽  
Single Wall Carbon Nanotubes ◽  
Scanning Calorimetry ◽  
Single Wall Carbon ◽  
Compatibilizing Agent

Isotactic polypropylene (PP) composite drawn fibers were prepared using melt extrusion and high-temperature solid-state drawing at a draw ratio of 7. Five different fillers were used as reinforcement agents (microtalc, ultrafine talc, wollastonite, attapulgite and single-wall carbon nanotubes). In all the prepared samples, antioxidant was added, while all samples were prepared with and without using PP grafted with maleic anhydride as compatibilizer. Material characterization was performed by tensile tests, differential scanning calorimetry, thermogravimetric analysis and Fourier transform infrared spectroscopy. Attapulgite composite fibers exhibited poor results in terms of tensile strength and thermal stability. The use of ultrafine talc particles yields better results, in terms of thermal stability and tensile strength, compared to microtalc. Better results were observed using needle-like fillers, such as wollastonite and single-wall carbon nanotubes, since, as was previously observed, high aspect ratio particles tend to align during the drawing process and, thus, contribute to a more symmetrical distribution of stresses. Competitive and synergistic effects were recognized to occur among the additives and fillers, such as the antioxidant effect being enhanced by the addition of the compatibilizer, while the antioxidant itself acts as a compatibilizing agent.

THE ROLE OF POTENTIAL FUNCTIONS IN THE MECHANICAL BEHAVIOR OF THE SINGLE WALL CARBON NANOTUBES

2012 ◽  
Vol 11 (03) ◽  
pp. 1240009 ◽  
Author(s):  
KEKA TALUKDAR ◽  
APURBA KRISHNA MITRA
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Interatomic Potential ◽  
Tight Binding ◽  
Flow Region ◽  
Potential Functions ◽  
Dynamics Simulation ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

Carbon nanotubes have been identified as the promising agents in reinforcing composite materials to achieve desired mechanical properties. In this study, three different types of single wall carbon nanotubes (SWCNTs) are subjected to molecular dynamics simulation to investigate their mechanical properties taking different interatomic potential functions. With unmodified Brenner's 2nd generation potential, a brittle fracture for all the SWCNTs is observed. But in tight-binding approach, the chiral and armchair SWCNTs exhibit somewhat extended plastic flow region before failure. With unmodified Brenner's potential, high tensile strength and ductility are observed for the armchair and chiral tubes. Y value of these two tubes is less than 1 TPa but more than 1 TPa for a zigzag tube. Much decrease of tensile strength and strain are noticed when we apply smoothing of the Brenner's potential at cut-off region. Failure stresses are dropped to much lower values for the three tubes. Ductility of the armchair and chiral tubes are also affected considerably by the choice of potential. Applying smoothing in the cut-off region to conserve the energy, the results show better agreement with the experimental findings.

scholarly journals Dispersion of single-wall carbon nanotubes with supramolecular Congo red – properties of the complexes and mechanism of the interaction

2017 ◽  
Vol 8 ◽  
pp. 636-648 ◽  
Author(s):  
Anna Jagusiak ◽  
Barbara Piekarska ◽  
Tomasz Pańczyk ◽  
Małgorzata Jemioła-Rzemińska ◽  
Elżbieta Bielańska ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Targeted Delivery ◽  
Congo Red ◽  
Binding Capacity ◽  
Aqueous Media ◽  
Strong Interactions ◽  
Single Wall Carbon Nanotubes ◽  
Scanning Calorimetry ◽  
Single Wall Carbon ◽  
Wide Range

A method of dispersion of single-wall carbon nanotubes (SWNTs) in aqueous media using Congo red (CR) is proposed. Nanotubes covered with CR constitute the high capacity system that provides the possibility of binding and targeted delivery of different drugs, which can intercalate into the supramolecular, ribbon-like CR structure. The study revealed the presence of strong interactions between CR and the surface of SWNTs. The aim of the study was to explain the mechanism of this interaction. The interaction of CR and carbon nanotubes was studied using spectral analysis of the SWNT–CR complex, dynamic light scattering (DLS), differential scanning calorimetry (DSC) and microscopic methods: atomic force microscopy (AFM), transmission (TEM), scanning (SEM) and optical microscopy. The results indicate that the binding of supramolecular CR structures to the surface of the nanotubes is based on the "face to face stacking". CR molecules attached directly to the surface of the nanotubes can bind further, parallel-oriented molecules and form supramolecular and protruding structures. This explains the high CR binding capacity of carbon nanotubes. The presented system – containing SWNTs covered with CR – offers a wide range of biomedical applications.

Mechanical Properties of Polyethylene Containing Defunctionalized Single Wall Carbon Nanotubes

2003 ◽  
Vol 791 ◽  
Author(s):  
Meisha L. Shofner ◽  
Haiqing Peng ◽  
Zhenning Gu ◽  
Valery N. Khabashesku ◽  
John L. Margrave ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Detrimental Effect ◽  
Functional Group ◽  
Load Transfer ◽  
Tensile Tests ◽  
Mechanical Analysis ◽  
Single Wall Carbon Nanotubes ◽  
Chemical Functionalization ◽  
Single Wall Carbon

ABSTRACTTo take advantage of the benefits of chemical functionalization and the desirable properties of unfunctionalized SWNTs, this research studies the effect of removing functional groups from SWNTs dispersed in a polymer matrix. Chemical functionalization of single wall carbon nanotubes (SWNTs) is a method for disrupting rope structure and adding reactive species to the nanotube to improve interfacial bonding and load transfer in composites, but changes to the nanotube hexagon structure caused by chemical modifications are expected to have a detrimental effect on the SWNTs' intrinsic mechanical properties. Thus, composites containing defunctionalized SWNTs and polyethylene are analyzed to evaluate the effect of functional group removal on the mechanical properties. The mechanical properties are measured using tensile tests. Issues of defects in the SWNT structure, polymer degradation, and changes in the fiber/matrix bonding as a result of functionalization removal are studied using Raman spectroscopy, thermogravimetric analysis, infrared spectroscopy, and dynamic mechanical analysis.

Estimation of the mechanical properties of nanocomposites based on the properties prediction of single wall carbon nanotubes (SWCNT)

2015 ◽  
Vol 57 (5) ◽  
pp. 447-457 ◽  
Author(s):  
Hassan S. Hedia ◽  
Saad M. Aldousari ◽  
Ahmed K. Abdellatif ◽  
Gamal S. Abdelhaffez
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

Confining H2 and D2 by adsorption in microporous carbons (single-wall carbon nanotubes and activated carbons) doped by K or Li

2005 ◽  
Vol 30 (4) ◽  
pp. 393-400 ◽  
Author(s):  
Szymon Los ◽  
Philippe Azais ◽  
Roland JM Pellenq ◽  
Yannick Breton ◽  
Olivier Isnard ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Activated Carbons ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Microporous Carbons
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